140098-Curved Hull Modelling

Code of Practice No. 10.2.2

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COP No.10.2.2

TRIBON OPERATIONAL GUIDE CURVED HULL MODELLING

COPYRIGHT VT SHIPBUILDING LTD

The property and copyright in these technical data vests in VT Shipbuilding Ltd. Fleet Way, Portsmouth, PO1 3AQ, England. These technical data shall not without the prior written permission of VT Shipbuilding Ltd. be either (a) copied, released or disclosed in whole or part to any third party, (b) used in whole or part for manufacture, or (c) sold, transferred or used in any other way detrimental to the interests of VT Shipbuilding Ltd. The receipt of these technical data from VT Shipbuilding Ltd. shall constitute an acknowledgement that it is disclosed in confidence and in agreement to the foregoing conditions.

Applicability: General

Name Title Date Signature

Content agreed : Bill Perry Engineering Systems Manager

30.07.07

Implementation agreed : Paul Minson

Technical Executive 30.07.07

Reviewed by: Martin Simmons

Engineering IT 08.07.08

Signed copy held in master file

Changes from previous issue: Reviewed No Changes

IF THIS IS A PRINTED COPY, YOU ARE RESPONSIBLE FOR CHECKING THAT IT IS THE LATEST ISSUE.

Contact : Engineering IT for queries and information


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CONTENTS 1 Introduction ...................................................................................................................... 4

1.1 Aims .............................................................................................................................4 1.2 Prerequisites ...............................................................................................................4 1.3 Objectives....................................................................................................................4 1.4 Introduction to the TRIBON Modelling Concept ....................................................5 1.5 Intelligent Modelling ...................................................................................................5 1.6 The Ships Co-ordinate System................................................................................6

2 The Curved Hull Modelling Concept.......................................................................... 7 2.1 Hull Form .....................................................................................................................8 2.2 Hull Curves..................................................................................................................9 2.3 Seams and Butts ........................................................................................................9 2.4 Shell Plates .................................................................................................................9 2.5 Longitudinals and Transversals ............................................................................10 2.6 Curved Panels .........................................................................................................10

3 Operational Flow Diagram..........................................................................................11 4 Starting Curved Hull.....................................................................................................12

4.1 Project Selection .....................................................................................................12 4.2 Entering the Curved Hull Environment ................................................................13 4.3 Opening a Drawing .................................................................................................14

4.3.1 Access an existing drawing ...........................................................................14 4.3.2 Create a new drawing ....................................................................................15 4.3.3 Accessing Existing Data ................................................................................16

5 Environment Settings ..................................................................................................17 5.1 The Default Surface................................................................................................17 5.2 The Default Parameters .........................................................................................17 5.3 The Default Box.......................................................................................................18 5.4 The Select Menu.....................................................................................................19

6 Hull Curves.....................................................................................................................20 6.1 Creating Hull Curves ..............................................................................................20

6.1.1 Principle Plane.................................................................................................22 6.1.2 Parallel to another curve................................................................................22 6.1.3 Sequence of shell curve.................................................................................23 6.1.4 Advanced Options ...........................................................................................25

6.2 Modifying an Existing Hull Curve ..........................................................................29 7 Storable Points ..............................................................................................................31

7.1 Creating Storable points: .......................................................................................31 7.2 Modifying Storable Points ......................................................................................34

8 Seams and Butts ...........................................................................................................35 8.1 Introduction ..............................................................................................................35 8.2 Creating Seams and Butts .....................................................................................35

8.2.1 Defining a Seams/Butts ..................................................................................35 8.2.2 Modifying an Existing Seam/Butt ..................................................................36 8.2.3 Verifying Seam/Butt Arrangement ................................................................37


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9 Creating Shell Plates ....................................................................................................39 9.1 Introduction ..............................................................................................................39 9.2 Creating Shell Plates ..............................................................................................39 9.3 Modifying an existing Shell Plate ..........................................................................41

10 Shell Profiles..............................................................................................................42 10.1 Introduction ..............................................................................................................42 10.2 Creating Longitudinals and Transversals ............................................................43 10.3 Modify Longitudinals and Transversals ...............................................................45 10.4 Adding Branches .....................................................................................................46

10.4.1 Introduction ......................................................................................................46 10.4.2 Adding a Branch..............................................................................................47 10.4.3 Deleting a Branch............................................................................................47

10.5 Shell Expansion View.............................................................................................48 10.6 Shell Stiffeners ........................................................................................................49

10.6.1 Splitting Longitudinals and Transversals .....................................................50 10.6.2 Combining split Longitudinals and Transversals ........................................50 10.6.3 Modifying Shell Stiffeners ..............................................................................51

10.7 Developed profile Views ........................................................................................53 10.8 Body Plan Views .....................................................................................................55

11 Additional Features for Shell Profiles .................................................................57 11.1 Holes .........................................................................................................................57

11.1.1 Inserting Holes .................................................................................................57 11.1.2 Modifying an Existing Hole ............................................................................58

11.2 Notches .....................................................................................................................59 11.2.1 Inserting Notches (Limber Holes) .................................................................59 11.2.2 Modifying an Existing Notch..........................................................................61

11.3 Cutouts (WT, NWT, SLOTS) .................................................................................62 11.3.1 Inserting Cutouts .............................................................................................62 11.3.2 Modifying an Existing Cutout.........................................................................63

12 Curved Panels............................................................................................................63 12.1 Introduction ..............................................................................................................63 12.2 Creating Curved Panels .........................................................................................64 12.3 Modifying an Existing Curved Panel ....................................................................65

13 To Create Framelines for Nested Plate...............................................................66 13.1 Create Framelines ..................................................................................................66 13.2 Inserting Subpicture on Nested Plate ..................................................................67 13.3 Updating Nested Plate ...........................................................................................67


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1 Introduction This manual is guidance in the use of Tribon Curved Hull Modelling, it is designed to guide the user in the creation of curved hull objects in accordance with VTs preferred methodology.

1.1 Aims Following this manual will ensure that all personnel using Curved Hull Modelling will operate the system in a consistent manner that meets VTs modelling standards and requirements

1.2 Prerequisites All users must have previously completed a Planar Hull Modelling course.

1.3 Objectives Within this manual the user will be guided on:- The basic Tribon panel concept Creating basic structural panels Modifying basic structural panels Adding plate seams, thickness, notches, cut -outs and holes Adding stiffeners, brackets and flanges Copying, moving and deleting Panels Understanding scheme files


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1.4 Introduction to the TRIBON Modelling Concept As with other modules you may have covered with Tribon, everything that you create, edit or delete will be from the PIM (The Product Information Model). This is a different concept then other CAD modelling packages, where copies of parts are retrieved from a vault to work on and replaced when finished. In all Tribon modelling tasks work is carried out on the live database, therefore all additions changes and deletions are instant. Parts or model objects are worked on via your PC and not on it.

1.5 Intelligent Modelling At the start of a project various hull standards are set in the database to identify the vessels main parameters, therefore all hull standards will be pre-defined for the project. The principle standards that are defined that the user should be aware of is:-

Frame and longitudinal positions Block / Unit Zones Material Grades Section types and sizes Cut-outs and Collars End Details Brackets

Tribon is a ship specific CAD modelling tool, therefore panel modelling can be created by selecting positions relevant to Frame positions and other ships structure.


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1.6 The Ships Co-ordinate System

Panels which are located in planes parallel to centreline, base line or frame line are localised by X distance, Y distance or Z distance respectively. Panels that are arbitrarily orientated are defined by giving XYZ co-ordinates for three points to define the plane. The moulded plane of the panel is always in the XY or (UV) plane of the local co-ordinate system.


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2 The Curved Hull Modelling Concept Tribon curved hull modelling is used to define the seams and butts of the vessels hull form and any other curved plated area. Tools are available to develop each defined plate area to check the overall developed size of the plate and to show rolling required for manufacture. Tribon curved hull modelling is also used to define the shell stiffening for the vessel, handling both longitudinal and transverse stiffening

As with the shell plates a quick development of each profile can be generated to check the overall developed length and the rolling required for manufacture. In addition to the Standard Tribon view (usually isometric) additional model views are available to aid the curved hull modeller in the positioning of seams, buts and profiles. These should include views of a Shell Expansion, Body Plan and Elevation: Example:- Shell Expansion

Note: If a Longitudinal, Seam, Butt etc is altered in any of the defined views, the other model views will reflect the change.


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Example:- Body Plan

After defining the Shell Stiffening, the profiles are split in the way of panel/unit/block butts. At this stage profile Endcuts, inclination and connection information can also be added. The relevant plates and profiles can then be collected to form a curved panel. These curved panels will be used to extract all relevant manufacturing information.

2.1 Hull Form Modelling in the curved hull environment can start as soon as a hull form is available, the hull form does not have to be the production faired hull form this can be swapped out as the hull form design is finalised. The hull form can be substituted at any time during the modelling process, this will enable the work to start earlier in the design process. It is recommended that the ships Hull model should be made up of the following drawings:- Hull Lines, Seams and Butts, Longitudinals and Transversals and Curved Panels.


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2.2 Hull Curves Once the Hull surface has been identified in the project, the surface can be checked by cutting frame and longitudinal curves. The surface cannot be viewed in Curved Hull so these lines need to be cut to verify the surface, holes between surfaces can be found easily using this method All curves defined must have its name prefixed by the Group name as initiated in the project set-up. As an example curves that are defined for the FAC project would be named as shown below. Frame Group Name

= FACX

Waterline Group Name = FACZ

Buttock Group Name = FACY

Longitudinal Group Name

= FACL

Transverse Group Name = FACT

2.3 Seams and Butts The definition of seams and butts must also use a name prefixed by the Group name as initiated in the project set-up. In the example of the FAC project all seams are named: Seam Group Name = FACS When seams are generated there is a tool available to quickly check the overall developed plate by selecting the seam boundary.

2.4 Shell Plates Once the seams and butts have been finalised and developed sizes and shapes checked, it is then possible to create the individual shell plates. These have to be created along with the Longitudinal and transverse structure before the creation of curved panels.


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2.5 Longitudinals and Transversals At the same time as the seams and butts are being developed and positioned creation of the shell profiles can begin. The Tribon concept is to create a single profile at each required position for frame and longitudinals, each shell profile will be created on a single run. Once all seams and butts have been finalised together with the transverse and longitudinal profiles, each profile can then be split at the required block/unit/panel position or when any relevant planar panels become available in the model.

2.6 Curved Panels When the shell plates have been created and the shell profiles have been split at the required panel position it is possible to create a curved panel. The curved panel is a combination of shell plates and shell profiles, plates and stiffeners created symmetrically cannot belong to a curved panel they must be modelled separately.


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3 Operational Flow Diagram

ENTERING THE CURVED HULL ENVIRONMENT

SAVE STRUCTURAL OBJECT AND DRAWING

OPENING A DRAWING

ACCESSING EXISTING DATA

SETTING THE DEFAULT BOX

CREATING HULL CURVES

CREATING STORABLE POINTS

CREATING

SEAMS & BUTTS

CREATING

SHELL PROFILES

ADDING BRANCHES

SPLITTING LONGITUDINALS & TRANSVERSALS

DEVELOPING PROFILE VIEWS

ADDING HOLES, NOTCHES & CUTOUTS

CREATING CURVED PANELS

PROJECT SELECTION CREATING

SHELL PLATES


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4 Starting Curved Hull 4.1 Project Selection A project selection must be made before any Tribon application is launched, this will ensure that the correct project is being worked on. To select the project go to the windows start icon and select:- Start > All Programs > Tribon M3 > Project Selection, this will launch the following window that will allow you to sign on to Oracle. Enter your clock number and password supplied and select OK, this will sign you on to oracle and allow you to select the required project as shown below.

Digitise the Project name that you are to work on and select the Select option. All Tribon modules will now be looking at the selected project, you can now enter the Planer Hull Environment.


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4.2 Entering the Curved Hull Environment Once the project selection has been made enter the Curved Hull environment, select:- Start > All Programs > Tribon M3 > Hull > Curved Hull, Oracle may ask you to sign on again. If you have previously signed on and selected the box to remember your password Oracle will not ask you to sign on again. When Curved Hull is launched the following window will be displayed, the tool bars displayed within the current session will depend on what was selected on the previous session.

Not all toolbars need to be displayed some toolbars will be launched automatically if a command requires an additional modifier.


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4.3 Opening a Drawing The Curved Hull environment will allow you to:-

a. Access an existing drawing. b. Create a new drawing.

4.3.1 Access an existing drawing To access an existing drawing select from the main toolbar File > Open, this will launch a selection window. If the window is empty select the list button to display all drawings in the database as shown below.

If a more refined listing is required enter part of the drawing name followed by a * (wild card). E.g. FAC-100-08* then select the List button, this will display all drawings that start with this prefix. Select the drawing required by digitising the drawing name in the list, the list button will now change to Open. Select this button to open the drawing.

The drawing that is opened is the master drawing and all objects that are displayed are live parts with in the database. If any changes, additions or deletions are made and saved the changes are permanent. Within the Tribon environm ent you cannot reset the part.


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4.3.2 Create a new drawing

To activate a new drawing select from the main toolbar File > New, this will launch a selection window to allow the selection of a drawing form. If the window is empty select the list button to display all drawing forms available in the database as shown below.

Select the drawing form required by digitising the form name in the list, the list button will now change to Insert. Select this button to insert the drawing form.

It is not necessary to insert a drawing form, if a drawing form is not required or you wish to insert a form at a later time select the cancel button. It is quite feasible to access existing data or even create new data and store to the database without saving the drawing. However if you are creating panels that will eventually need a panel drawing that must be issued, creating views and string in the required drawing/ panel name will not only make the information easier to access but will save time when the drawing is ready to be created.

The deck panel below is being created within the drawing sheet, the panel drawing can be created at the same time the panel is being modelled.


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4.3.3 Accessing Existing Data To access current data and display in a selected view the following icon must be selected from the standard toolbar. If this tool bar is not active go to the main toolbar and select:- View > Toolbars > Standard When selected the following toolbar will be displayed

When the database icon has been selected the model selection window will be displayed.

This interface allows the selection of existing models in the database, the user can then select which view orientation to display the selected objects in within the active drawing. The different types that are frequently used in curved hull are as follows: Curved Panel = Panels that have shell plates and shell stiffeners related. Shell Profile = Lists all continuous profiles. Plate = Lists all shell plates. Surface = List all RSOs. Hull Curve = Lists all seams, longitudinal and transverse curves.


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5 Environment Settings

5.1 The Default Surface To start modelling the surface to be used in modelling must be selected, this is not required if working on an existing part but is good practice at the start of a new part. To set the default surface select the command Curved > Default > Surface.

Select the surface that is the one to work on and select OK. This will set the selected surface as default, for the system will use this surface for all commands until an alternative command is selected. By default the surface will always use main hull as the default surface unless another surface is selected.

5.2 The Default Parameters A default parameter file controls the behaviour and appearance of all graphics on the screen, in curved hull modelling environment. This file can be viewed by selecting Hull Tools > Default Parameters. However these default settings should only be changed by a member of the Shipbuilding IT department.


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5.3 The Default Box The default box is required to determine the extents of any operation on the nominated surface, the extents are controlled by the default box which acts as a trimming box. To set the default box select: Curved > Default > Box this will launch the adjacent menu. Key in the desired values in the relevant fields and select OK. FR & LP positions can be used but must be in upper case.

There is a button that can be selected Show, that will display a bounding box around the parameters that have been selected.

In the example above just the port side of the main surface will be available for selection, all values have been set to No_Limit except for the minimum Y value that is set to 0 on the centreline. The initial recommendation is to set the box to cover the whole ship, then adjust the box if a smaller area is to be worked on. When a basic curve is generated local settings in the command can control the extents, however when the advanced selection is made the system will use the values set in the default box.


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5.4 The Select Menu The select menu allows the filtering of objects in the Curved Hull environment that needs to be selected, quite often in curved hull different entities can be positioned in the same model space or too close to allow a digitised selection. The command from the toolbar Curved > Select > In Drawing will allow the digitised selection in the curved hull environment, to use the filtering for a mode controlled method of selection select toolbar Curved > Select > Advanced.

This will launch a menu that will allow you to choose the type of object to select. Digitise the drop down menu adjacent to Type, this will display a list of all the possible entity types in the curved hull environment. Select the required type and select Pick to immediately select an object, select Apply if more object types are required in the filter or OK if the types are not ready to be indicated.

After the selected filter has been used remember to reset the filter back to All, failure to do this will restrict entity selection in subsequent commands.


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6 Hull Curves When a new project has been created it is recommended to verify the quality of the surface, generating a series of frame, buttock and waterline curves can do this. These curves are collectively known as Hull Curves. The successful generation of a Hull Curve at every frame and longitudinal position is a good indication that the hull form is a suitable quality to allow more complex curved hull modelling to be carried out, check that all curves have been generated as requested and that there are no holes between surface patches.

6.1 Creating Hull Curves The following chapter describes the options available to define hull curves, from the toolbar select Curved > Model > Create Hull Curve to launch the menu as displayed below.

The first Tab allows the user to enter a name for the curve to be created, this must be strictly in accordance to the naming conventions. Frames = X e.g. Hull curve at frame 20

= FACX20 Buttocks = Y e.g. Buttock at 700mm off CL

= FACY700 Waterlines = Z e.g. Waterline at 5000mm A/B = FACZ5000

Please note curves should only be generated for the Port side of the ship, the system will automatically create the Stbd side of the vessel. Note: The limit box should be set to default. (Y = min 0, max No_Limit). The Y min setting in the Limit box should never be set to less then 0 (zero), never select Over/in CL. The second tab allows limits to be entered, this will set the extent of the curve to be created.


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These values will overwrite those values set in the Limit Box (see chapter 6.3), a button selection is available for commonly used settings: Portside Resets the Y min to 0 Starboard Resets the Y max to 0 Any A box over the Centreline will be defined Default Resets values to the default box values

The last tab is the curve data tab this is going to decide how the curve is to be defined, there are three principle options Principle Plane, Parallel to another curve and Sequence of Shell Curves.


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6.1.1 Principle Plane To Generate a hull curve using principle plane, select the drop down adjacent to Axis select the principle plane required X, Y or Z. Frame = X value, Buttock = Y value and Z = Waterline. Next select the coordinate value (FR & LP values are valid), multiple values can also be defined i.e. FR0(1)20 = Make the first cut at frame 0 then at every frame spacing until frame 20. 0(1000)2000 = Make the first cut at X= 0 then at every 1 metre spacing until 20 metres. The name on the first tab would = FACX0(1)20, this would tell the system to increment the frame name by 1 until frame 20 is reached.

6.1.2 Parallel to another curve Set the type to parallel to another curve, from the drop down adjacent to Curve name pll digitise the following button . This will allow the user to digitise an existing curve, the selected curve name will now be displayed in the box adjacent to Curve name pll

There are two values that can be entered for offsetting the curve. A value entered in the Distance box (mm) will be the offset distance used from End 1, a value entered in Distance end 2 box will be the offset distance from End 2 . If no value is entered in the Distance end 2 box, the value for End 1 will be used.


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Direction: The FWD or AFT direction of a curve of the curve can be selected, this will dictate the direction of a taper if different offset values are entered for End 1 and End 2. Method; X, Y or Z means that the displacement is made along curves created by intersecting the surface with principle planes perpendicular to the given coordinate axis. Perp means that the curves are created by the intersection of the surface and planes that are perpendicular to the original curve at a certain point. Using Perp will produce a developed plate that has a constant distance between the two edges made from two parallel seams. Used in two directions, this can create a rectangular (or close to rectangular) developed plate. Side: denotes which side of the selected curve to offset the new curve. Tolerance: The default tolerance is set to 3mm this value has to correspond to the accuracy of the given surface. Iterations: The maximum default value for number of iterations is 20, which will use the default tolerance value as set above. Excess end 1: Extension required beyond end 1 (Not Used) Excess end 2: Extension required beyond end 2 (Not Used) Approximate plane: When this is set, an approximate parallel displacement is done, with the restriction that the resulting curve is planar. In this instance only three points are displaced, and then a plane is created using these points. At each end and the midpoint of the original curve. When all selections have been made select OK, the new curve will now be offset from the selected curve.

6.1.3 Sequence of shell curve This selection will create curves between two selected curves and equally space them the resultant curve/curves between these two selected curves. Set the type to Sequence of shell curves, from the drop down adjacent to Base name pll digitise the following button . This will allow the user to digitise an existing curve, the selected curve name will now be displayed in the adjacent box. End name pll: Digitise the following button adjacent to End name pll, this will allow the user to digitise a second curve. The name of the curve will now be displayed in the adjacent box.


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Number of: The number specified will be the number of new curves to be generated between the two selected curves. Method: X, Y or Z means that the displacement is made along curves created by intersecting the surface with principle planes perpendicular to the given coordinate axis. Perp means that the curves are created by the intersection of the surface and planes that are perpendicular to the original curve at a certain point. Tolerance: The default tolerance is set to 3mm this value has to correspond to the accuracy of the given surface. Iterations: The maximum default value for number of iterations is 20, which will use the default tolerance value as set above. Excess end 1: Extension required beyond end 1 (Not Used) Excess end 2: Extension required beyond end 2 (Not Used) Approximate plane: When this is set, an approximate parallel displacement is done, with the restriction that the resulting curve is planar. In this instance only three points are displaced, and then a plane is created using these points. At each end and the midpoint of the original curve. When all selections have been made select OK, the new curve/curves will now be created.


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6.1.4 Advanced Options Advanced gives additional options for curve generation as shown opposite: Option 1 by plane will give a number of options on creating a curve by defining a plane. Option 1 will launch Type of Plane menu as shown below:

Select 1 = Principle plane: is in chapter 7.1.1 a plane in the X, Y or Z axis. Select 2 = 3 Points give 3 X, Y, Z coordinates to Define a plane. Select 3 = 2 Points + an Axis : The plane is defined by 2 points and the condition that the plane is parallel to one of the principle axis.

The images below show two typical examples

Plane Parallel to the Z axis Plane Parallel to the X axis

Select 4 = 2 Points + Angle:

The plane is defined by 2 points and an angle in the Plane defined by the two co-ordinate axis

Select 5 = Rotated Plane: This function creates a plane by rotating a principal plane around one of the principal axis.

Select 6 = Existing Plane/Panel: The plane is defined by selecting an existing plane or panel


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Option 2 By General Cylinder: A general cylinder is a special type of surface used to intersect the hull form. The user defines a series of points and the system creates a directrix through the points. The directrix is then projected along a user defined generator axis through the hull form. (Note:- Storable points see section 8)

A general cylinder where the plane is XZ

Example:- If a curve is being generated through some existing points use By General Cylinder to select the points and project a curve back on to the main hull form. Select Curved > Model > Create Hull Curve , select the Curve Data tab and select Advanced.

Select option 2 By General Cylinder, this will display the following menu.

This menu will determine the direction of the directrix, which is the projection direction that the curve will be generated in. In the following example option 2 Y has been selected

This will display the following menu, Coordinates can be entered to determine the first point or recommended select indicate to allow the user to select by digitising a predefined point.

Use the 2D point mode menu to select the point modifier and digitise all required points that will determine the shape and extent of the curve.


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The following image shows the elevational view that was used to select the points in, and the curve created in the isometric view as well as the elevation.

Please Note: View selection is very important when selecting data, the curve must be projected in the same view as the digitised data. Option 3 - Parallel another shell curve: Inserting a curve parallel to another shell curve allows the user to select an existing hull curve. Select Curved > Model > Create Hull Curve , select the Curve Data tab and select Advanced. Select option 2 - Parallel another shell curve, the system will ask the user to select an existing hull curve Indicate. This will launch the Parallel Curve menu, insert the required distances, method and side for the curve offset projection and select OK. Please note that the tolerance value and iteration setting should not need to be changed.


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The newly created curve should now be visible, a menu will now be displayed, this will allow a name to be assigned to the new curve. Once the curve has been assigned a name the curve can be stored in the database.

The menu will also display the extents parameters that will allow the curve extents to be changed if required.

Option 4 Combination of Curves: The type of curve generation is used to combine existing Seams and Butts, as the combination of Hull Curves has no real benefit. Option 5 Getting curve from existing source: If a curve has been made available from a surface system it can be called into Curved Hull Modelling and used to define a hull curve. Option 5 Reflected in CL: This function creates a curve by reflecting another one in the center line of the ship. Any curves already selected will be used as input to this function. If there are no curves selected, you will be asked to define or select one or more. Option 5 Existing: Allows the selection of an existing curve for modification regardless of the Curved > Select > Advanced option being set to Hull Curve.


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6.2 Modifying an Existing Hull Curve If a Hull Curve needs to be modified the following steps must be taken. Assuming a drawing is displaying the required curve the advanced filter should be set to ALL or Hull Curve. Select Curved > Model > Modify and digitise the curve to change, as soon as a curve has been selected the system will display the following menu.

The displayed menu allows the extents of the curve to be modified or the Modify Curve button can be selected.

The Modify Curve will display the Modify Curve menu, there are 4 options on this menu that can be selected. Option 1 - Select Surface: The surface selection form will be displayed allowing the user to select a different reference hull surface. Option 2 Modify Plane: Modify plane of the selected curve, depending on the definition of the original curve, a dialogue box as shown below will be displayed.

On selection of Modify plane the 1st menu displayed will depend on how the plane was originally defined, by selecting the Select Type button will display a menu for redefining the plane.


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Option 3 Select Type: Selecting this option results in the create curve menu being Displayed, allowing the method used to generate the curve being changed. Option 4 OK: After completing any changes select OK to execute the changes. The system will regenerate the hull curve in the drawing and return to the original hull curve modification menu.


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7 Storable Points

7.1 Creating Storable points: It is possible to create points for use in defining curves, seams or profile curves. To display the available options select Curved > Model > Create Storable Point This will display the Type of Point menu Option 1 3 Coordinates: Will allow 3 keyed in coordinates to

determine the Point. The Point by 3 Coordinate menu will be displayed

Enter the XYZ coordinate position (no spaces separated by commas), and select OK. A menu will now be displayed which will allow the user to enter a name for the new point

Enter the name select OK and then Store the point into the database. Please Note all points generated will only appear in the views defined at the time of point creation, this is very important when a curve has to be projected through the points in a certain view.

Option 2 Surface intersected with a line: The point created will be used to define a line that is parallel to one of the co-ordinate axes. X/Y Approximate Z X/Z Approximate Y Y/Z Approximate X


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The coordinates should only be keyed in the order displayed. E.g. for example shown First Coord = X, Second Coord = Y, The Approximate Coord need only be used if the line will intersect the surface at more then one location. Apply may be used when defining more then one point. When finished selec t OK. Key in the name of the point then select OK. Option 3 Curve intersected with plane: Firstly select one or more curves using Curved > Select > In Drawing or Curved > Select > Advanced. (However please be sure that the selected curves will pass through the plane to be defined). Define the plane to be used to intersect the curves previously selected and select OK. Key in the name of the newly created points and select OK. If the points that have been created are acceptable store the points in the database.

Option 4 Point Moved Along Curve:

This is one of the most commonly used options. Firstly select one or more curves using: -

Curved > Select > In Drawing or Curved > Select > Advanced, next select:- Curved > Model > Create Storable Point


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Select option 4 will display the following menu. This menu will allow the user to enter a distance along a curve to generate a point and allow the user to nominate which end of the curve the dimension will start at.

Enter a Distance and From end and select OK, again the menu to allow a name to be entered for the point will be displayed. Apply the name and store the point if acceptable Note:- When positioning a point at a nominated distance from a curve end select Apply. When positioning a set of points at a given distance from point positioned from curve end select OK, repeat the command for each point required selecting distance and direction (from end) required. Option 5 Intersection Between Two Curves:

Select two ( or more) intersecting curves, Select OC. Select Curved > Model > Create Storable Point select option 5. A point will be generated At the intersection of the two curves.

Option 6 - Existing: Allows the user to select a point for modification, regardless of the Curved > Select > Advanced option being set to points.


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7.2 Modifying Storable Points To Modify a storable point it may be advisable to select the point filter first. Select Curved > Select > Advanced and select Points or use option 6 Existing from the create storable point menu. Next select Curved > Model > Modify, if the point has already been selected the following menu will be displayed. Depending on how the point was defined will depend on the different options made available.

A modification form for a point created by 3 coordinates will be displayed if this is how the point was defined. The form will allow new coordinate values to be entered.

If a point was defined by a distance along a curve then the modification menu will be displayed to allow this definition to be changed. When happy with the modifications select OK, and Store and Skip.


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8 Seams and Butts

8.1 Introduction In Tribon Shell seams are perceived as being run in the longitudinal direction and butts are running in the transverse direction. The default box controls the extent of the seams and butts created. Seams and butts are used to define the boundary of each shell plate and for this reason a clear intersection of each plate corner must be defined. To that extent is common practice to allow the intersection at each corner of seams and butts to run past by at least 50mm at each intersection.

8.2 Creating Seams and Butts There are two different situations that can occur when the function Curved > Model > Create Seam/Butt is invoked. 1. If no curves are active in the Select List the system will provide prompts allowing the user to define the line of the seam or butt. After defining the line the system will prompt for a name of the resulting Seam/Butt. 2. If a curve(s) is active in the Select List the system will make a Seam/Butt out of the Curve(s). The system will then prompt for a name of the resulting Seam/Butt.

8.2.1 Defining a Seams/Butts Ensure the default box has been set and ensure that no objects are selected. Start the command Curved > Model > Create Seam/Butt alternatively select the icon

from the Curved Hull toolbar. The menus that are applicable to creating a Hull Curve is the same menu that applies to creating a Seam/Butt. The Block Limit check box will be active on the General Tab that will allow bold line to be displayed in the event of a block break as apposed to a plate seam.


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8.2.2 Modifying an Existing Seam/Butt If after some seams and butts need to be modified ensure that the advanced filter is set to all or Seam/Butt, start the command Curved > Model > Modify alternatively

select the icon from the Curved Hull toolbar. The system will prompt the user to indicate the seam/butt to modify The displayed menu allows the extents of the curve to be modified or the Modify Curve button can be selected.

The Modify Curve will display the Modify Curve menu, there are 4 options on this menu that can be selected. Option 1 - Select Surface: The surface selection form will be displayed allowing the user to select a different reference hull surface. Option 2 Modify Plane: Modify plane of the selected curve, depending on the definition of the original curve, a dialogue box as shown below will be displayed.

On selection of Modify plane the 1st menu displayed will depend on how the plane was originally defined, by selecting the Select Type button will display a menu for redefining the plane.


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Option 3 Select Type: Selecting this option results in the create curve menu being Displayed, allowing the method used to generate the curve being changed. Option 4 OK: After completing any changes select OK to execute the changes. The system will regenerate the hull curve in the drawing and return to the original hull curve modification menu.

8.2.3 Verifying Seam/Butt Arrangement At any time during the Seams and Butt definition individual plate boundaries can be checked, a developed sketc h can automatically be created in order to check the developed plate size required to manufacture the plate. To create a developed plate view it is necessary to identify the bounding seams/butts, therefore a suitable view must exist to allow these to be selected. To create a developed plate sketch start the command Curved > View > Developed Plate , the system will prompt the user Indicate seam. Digitise the seams/butts in a clockwise direction around the plate boundary, select OC when this has been done.


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The following menu will now be displayed, at this stage only a visual representation of the developed plate is required, therefore most of the fields can be ignored. However the following fields must be selected: Symmetry: Select the side of the ship the plate is valid for.

Thickness Inside: Thickness inside the moulded line Thickness outside: Thickness outside the moulded line of the surface The remaining fields will be used when actually storing the developed plates to the database and will be covered later. After completing the fields described above click the OK button. The system will prompt Cursor position, indicate a position in the drawing for the resulting view. After positioning the view use OC button to exit the program, the plate will be placed in the drawing. See image below:

The developed plate will have a rectangle drawn around which is the smallest circumscribed rectangle that will be dimensioned. Use Curved > Select > Skip All to end the command and the sketch will be removed from the drawing.


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9 Creating Shell Plates 9.1 Introduction After the Seams/Butts have been defined it is then possible to create the shell plates for the vessel. The shell plate will contain the thickness for the plate, the position of the thickness relative to the moulded plane, any bevel information for the plate edges and also any excess to be applied to any edge of plate. A created shell plate must have at least 3 seams/butts and at the most 5 seams/butts defining its outer contour. As mentioned in the previous chapter it is also good practice to have at least a 50mm overlap of seams/butts to ensure a good intersection. Please Note:- It is good practice to create the shell plates for port and starboard separately, differing piece-part numbers and the creation of curved panels (covered in a later chapter) will give good reason for this approach. When created these shell plates will be stored in the database, when required for production these pates will be processed through the Curved Plate Generation Program. This program will develop the pate and add any user defined compensations (i.e. bevel, excess, shrinkage, etc), as well as adding marking information to the plate.

9.2 Creating Shell Plates Ensure the default box has been set and ensure that no objects are selected. Start the command Curved > Model > Create Shell Plate alternatively select the icon

from the Curved Hull toolbar to launch the following menu. There are two options available: Single Shell Plate: This allows the individual creation of a shell plate by selecting individual seams/butts in a clockwise order (starting with the aft most seam/butt). (Preferred Method)

Multiple Plates from Grid: A grid of seams/butts is defined and the system will create shell plates for all closed boundaries within the grid. First indicate all the butts, starting with the one with the longest girth distance from the centreline then select OC button again. (Please note this option only works for a symmetric grid.)


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After defining the boundary of the shell plate the following menu will be displayed. Symmetry: Defines which side of the ship the resulting plate is on. Position Number: Allocates a position no to the plate. A unique number should always be allocated to each shell plate.

Thickness Inside: Plate Thickness inside the moulded line of the surface. Thickness Outside: Plate Thickness outside the moulded line of the surface. Shrinkage: The shrinkage allowance for welding of stiffeners etc. Partition: The partition for the given shrinkage allowance, optional. Quality: Material quality code or material specification. Seam No: Gives the seam/butt number that defines the edge of the plate, default. Bevel: Gives the bevel code for each of the plate edges, optional. Compensation: Gives a compensation value for each plate edge, optional. Excess: Gives an excess value for each edge of the plate, optional. Parts List: Identification string defined by the user, optional. Surface Treatment: Identification string defined by the user, optional. Destination: Identification string defined by the user, optional. Raw Plate: Name of raw plate to use, optional General Purpose Strings: Identification string defined by the user, optional.


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After completing the desired fields click OK button. The system will now calculate the development of the shell plate and hatch the relevant shell plate in the drawing. After completing this, the system will display the menu shown opposite: Plate Name: The name of the resulting shell plate(s). Auto Name: This will automatically assign a posno against the plate (Not Used) Add Posno: This will add a (dash) and a posno to the plate name. (Not Used)

9.3 Modifying an existing Shell Plate If after creating a shell plate, it becomes necessary to modify it the following steps should be taken. Assuming a drawing is current and the shell plate existing one of the views. Ensure the advanced filter is set to All or Shell Plate. Start the command Curved > Model > Modify , alternatively select the following

Icon from the Curve Hull toolbar. The system will prompt the user to indicate a shell plate to be modified. The system will display the menu used to generate the shell plate. Edit the fields, as described previously and select OK button when editing is complete. The system will recreate the shell plate and also redevelop it. If happy with the result use the command Curved > Select > Store and Skip.


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10 Shell Profiles

10.1 Introduction The Tribon concept calls for topological references to be used in all possible cases. Therefore longitudinal and transversal shell profiles are usually created right along or around the ship. This profile will have one name and all other Tribon objects will use this name as a reference. Below the master name the longitudinal or transversal is broken down into shell stiffeners, usually defined by unit divisions. These sections of Longitudinal or transversal have the master name appended with s1, -s2 etc. The modelling of a fully detailed Longitudinal or Transversal is made up of a number of stages: The Trace line for the longitudinal or transversal is defined, this trace definition also defines the fore and aft limits for a longitudinal and the upper and lower limits for a transversal. A profile type and scantling is applied to the trace along with information including the name for the shell profile, the orientation of the profile and the side of the surface the profile is welded to. The longitudinal or transversal is then split into suitable lengths to suit material availability and block/unit division. After splitting the longitudinal or transversal the various parts of the longitudinal or transversal can be modified. This includes defining different material for the individual parts as well as defining inclination and endcut information for the individual parts.


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10.2 Creating Longitudinals and Transversals To create a shell profile, ensure that the relevant curves are visible in a view and select one curve to generate a profile on. Firstly select one or more curves using Curved > Select > In Drawing or Curved > Select > Advanced > Hull Curve. If this is not done the Create Shell Profile menu will be displayed when the command starts, the preferred method is to pre-select the hull curves. Start the command by selecting Curved > Model > Shell Profile Create, alternatively

select the following Icon from the Curved Hull toolbar. If this occurs select Advanced from the Curve Data tab and select item 7 Existing from the next menu displayed. This will allow the user to digitise a curve to generate the profile on. The following menu will now be displayed enter the required data to generate the profile.

Long/Trans: Select from the drop-down menu the type of profile being generated, this field should default to the curve selected.


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Profile: Enter a number for the profile, the number will be prefixed by the system with the project name and L for longitudinal or T for transverse profile. Numbering of Shell Profiles:

Longitudinals = position number multiplied by 10 E.g. LP20 = 200 Transversals = FR1 = 1, FR20 = 20 Frame numbers may also be multiplied by 10 if half frames are required.

It should be noted that certain blocks of numbers have been reserved for specific situations. Longitudinals: Symmetrical and port side unique = FACLG = 1 > 999 Symmetrical and port side unique on a

parabolic deck surface = FACLG

= 1000 > 1999

Starboard Unique = FACLG = 2000 > 2999 Starboard Unique on a parabolic deck

surface = FACLG

= 3000 > 3999

Transverse: Symmetrical and port side unique = FACTG = 1 > 999 Starboard = FACTG = 5000 > 5999 Auto Profile: This box will only appear if multiple profiles are to be defined,

checking the Number box will result in Longitudinals being automatically numbered in steps of 10 from the first number given. Transversals will be automatically numbered in steps of 1 from the first number given.

Symmetry: The side of the ship for which the resulting profile is valid. Profile Side: Whether the resulting profile is inside or outside the hull form Material Side: The direction of the profile material relative to the defined trace line. Profile Data: Select a method of defining the profile type and scantlings. Form: Values will be typed directly into the fields on the menu Menu: The system will display a menu of profile types, the user

will select required values from the menus Same

As: The system will prompt for an indication of an existing shell profile. The profile type and scantlings will be picked up from the existing shell profile indicated


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Perpendicular Whole by Default:

This box is only visible when creating a new shell profile, this selected box will initially set the profile perpendicular to the surface along its entire trace.

Type: A valid Tribon profile code, i.e. 10 = Flat Bar, 20 = Bulb Bar, etc. Dim: Valid scantling size for type previously selected i.e. 100*10 for Flat

bar Qual: A valid quality or material code, i.e. A for grade A quality steel. After completing the relevant fields, select the OK button. The system will now generate the shell profile in all relevant views. To save select Curved > Select > Store and Skip.

10.3 Modify Longitudinals and Transversals If after modifying a shell profile, it becomes necessary to modify it the following steps should be taken. Assuming a drawing is current and the shell profile exists in one of the views. Set the filter to All or Shell Profile , Longitudinal or Transversal. Start the command by selecting Curved > Model > Modify , or alternatively select the

following Icon from the Curved Hull toolbar. The system will prompt the user to indicate the profile to be modified. Once selected the system will display the following menu, this menu displays the settings used to generate the profile. Apart from changing settings as described in the initial profile generation, the menu also allows:- Add Branch: This allows the addition of a Branch (explained in the following chapter).


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Modify Box: By selecting this button the extents of the shell profile can be changed. Modify Curve: This button allows the modification of the curve.

10.4 Adding Branches

10.4.1 Introduction During the task of arranging shell profiles it is common to crank a longitudinal from one plane to another, this is known as adding a branch. The branch will belong to an existing shell profile and the connection between the existing profile and the branch will be a welded knuckle, not a bent knuckle. It is possible to add multiple branches to a shell profile with only one pre-requisite being that the new branch must be connected with one of the existing end points of the shell profile.


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10.4.2 Adding a Branch To add a branch ensure the filter is set to All or Shell Profile, use the command Curved > Model > Modify and select the relevant shell profile. Once selected the Shell Profile Menu will be displayed, at the bottom of this menu will be a button Add Branch. Select this button and the system will now display the Create Shell Curve menu. If the curve exists and one end of the curve connects with the end of the shell profile, select the Curve Data tab then select Advanced. The Type of Shell Curve menu will now be displayed, select option 7- Existing and digitise the curve. Select OC (operation complete) to generate the new branch and return to the Shell Profile menu, if there are no more branches to add to the selected profile select OK. If the result is acceptable select Curved > Select > Store and Skip .

10.4.3 Deleting a Branch A view should exist in the current drawing containing the relevant shell profile. Use the command Curved > Model > Modify and select the relevant shell profile, select the Remove Branch button. The system will prompt Indicate shell stiffener in curve branch to remove and the user should indicate the branch to be removed. The system will now remove the selected branch and redisplay the shell profile modification menu. Select the OK button, use Curved > Select > Store and Skip.


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10.5 Shell Expansion View The shell expansion view is created by developing objects along the frame curves, this results in a view of the shell as if it was laid out flat with all the frames parallel. To create a Shell Expansion View a drawing must be current. Use the command Curved > View > Shell Expansion. The menu shown below will appear. View Name: Name of view to be created. Side: The side of the ship to be displayed in the view. Surface: The name of the surface from Which the expansion will be Generated. Stern: Defines the Aft limit of the view, can be defined as an X ordinate or an existing seam. Stem: Defines the fore limit of the view, can be defined as an X ordinate or an existing seam.

Upper: Defines the upper limit of the view, can be defined as a Y or Z co-ordinate or an Existing seam. Default means uppermost part of the ship. Lower: Defines the lower limit of the view, can be defined as a Y or Z co-ordinate or an Existing seam. Default means the ships CL. Developed from: Defines the position from where to start the development. Can be defined by a Y or Z co-ordinate. Object Selections: There are seven tabs to filter to control what will be displayed in the Shell expansion view, these are: Panels: Include all panels within the limits of the view. Blocks: Include all blocks within the limits of the view. Seams/Butts: Include all seams/butts within the limits of the view. Longitudinals: Include all longitudinals within the limits of the view Transversals: Include all transversals within the limits of the view


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Curves: Enter a name of a specific view to be included in the view, The line display type can be changed for each curve.

Penetrations: Include all symbols for drain and air holes in Plane panels and shell profiles, within a certain distance from the shell.

Note: When Auto selection is ticked, all items of that type will be included in the view, to exclude individual items enter the names in the Excluded objects list. When auto selection is not ticked, all items of that type will be excluded from the view. To include individual items enter the names in the included objects list. After completing the form use the OK button. The system will then prompt for an indication in the drawing to position the Shell Expansion view. After positioning the view use OC button to exit the command.

10.6 Shell Stiffeners Shell stiffeners are the result of shell profiles (Longitudinal / Transverse) being split. For example if a longitudinal profile LP100 was split in two positions along its length, this would result in three shell stiffeners L100-S1, L100-S2 & L100-S3. If the longitudinal object was not split the result would be one shell stiffener L100-S1. The difference in shell profiles and shell stiffeners is very important during the curve modelling process. Care should be taken when modelling, select shell stiffeners if a change is applied to part of the longitudinal / transverse profile or select shell profile to make a global change along the whole object.


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10.6.1 Splitting Longitudinals and Transversals After the creation of the shell profiles it will become necessary to split them into 2 or more parts, the following steps should be taken. Select the profile to be split using the Curved > Select > Advanced option, select the type to Shell Profiles and select the Pick button and indicate shell profiles to split. Start the command by selecting: Curved > Model > Shell Stiffener > Split the system will display the following menu. Seam or Curve: Indicate an existing seam or curve and the selected shell profile(s) will be split at this point.

Plane: Define a plane to split the shell stiffener around, all plane definitions can be used. Shell Profile: Indicate an existing shell profile to split the current shell profile. Plane Panel: Indicate an existing planar panel to split the current shell profile around. After defining the split the system will graphically split the shell profile(s) in the drawing, if happy with the result use Curved > Select > Store and Skip . The system will now store the shell profile with the new parts stored as shell stiffeners belonging to the shell profile.

10.6.2 Combining split Longitudinals and Transversals If changes occur it may be necessary to remove the split and re-combine a previously split profiles. Select the profile to be split using the Curved > Select > Advanced option, select the type to Shell Stiffener and select the Pick button and indicate shell profiles to split. Start the command Curved > Model > Shell Stiffener > Combine, the system will combine the two activated shell stiffeners and display the resulting combined shell profile in the drawing. If happy with the result use Curved > Select > Store and Skip .


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10.6.3 Modifying Shell Stiffeners After creating a Shell stiffener it becomes necessary to modify, set the advanced filter to Shell Stiffener. Start the command by selecting Curved > Model > Modify , or alternatively select the

following Icon from the Curved Hull toolbar. The system will prompt the user to indicate the required stiffener, digitise the stiffener required to launch the following menu:

The menu comprises of four tabs: General, Profile, End1 and End2. General: This includes Name Prefix: The name of the profile Running Number: The stiffener number in the current profile Posno: Add or change the position number


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GPS Nos: General purpose strings. Shrinkage: The shrinkage of the stiffener measured in mm/m Location Code, Parts List Name, Surface Treatment and Destination: These are all identification strings with a purpose defined by the user. Modify Individual Stiffeners: Normally when a group of stiffeners are selected, it is assumed the same modification is required for each of the stiffeners. If this is not the case, this box may be ticked to treat each stiffener individually. Profile: The profile tab contains the following data.

Symmetry: Used to define the symmetry of the stiffener and is also used to define a dummy interval. If the stiffener is defined as dummy symmetry then the stiffener will have no material assigned. All that will be visible for the shell stiffener will be the trace line. (This can be selected at an time and a new material assigned. Bevel Trace: Use a valid bevel code to define the bevel to be applied along the whole trace of the shell stiffener. Material from: Leave as Form to allow direct entry in the type, Parameter and Quality Fields. Default will revert back to the original values. The angle at the stiffener end is in the plane of the trace curve used to define the shell stiffener. The system will interpolate all angles between the two end points. Set to Menu to display the available profile types and scantlings. Set to Pick to allow the indication of an existing shell profile to use the same settings. Material Side: The direction of the thickness of the stiffener may be modified.


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End 1:

Incl. Type: Default: The default settings used to define the profile will be used. Perp: The angle at the stiffener end is perpendicular to the surface at the end point. The system will interpolate all angles between the two end points. Perp Whole: The stiffener will be perpendicular to the surface at every point along its Length. XT, YT, ZT: May be used in combination with the Angle fields to set explicit

10.7 Developed profile Views At any time during modelling a shell stiffener can be checked, a developed sketch can automatically be created in order to check length and inverse bending curves required to shape the stiffener.


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To create a developed stiffener view, it is necessary to add the shell stiffener to the profile database using the function Curved > Model > Shell Stiffener Prof to DB. The system will prompt Indicate (select shell stiffeners to add to database). Select OK button on completion. To create and view a developed profile sketch start the function Curved > View > Shell Stiffener. The system will prompt Indicate Shell Stiffener select shell stiffeners to view. The system will display the developed shell stiffener and prompt Cursor Position place the view on the drawing left click on mouse to fix position, left click on mouse again to move view to new position. This can be repeated as many times as is required, use OC button to exit the command.


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10.8 Body Plan Views A body plan view is best described as a number frame sections displayed on top of each other. The view can be limited in its extension in all directions and the objec ts to be included in the view can be controlled by form input. To create a body plan view, within a drawing use the command Curved > View > Bodyplan, this will display the following menu. View Name: The name of the resulting view. Surfaces: Name of all surfaces required when generating the body plan. Looking: The direction of the view. Limits: The limiting box of the view, objects partially or in the box will be included in the view. View Properties: Long Selection image: How the profile will be represented in the view. Mould: Only the mould line and the top edge of the flange will be drawn.

Tick: Only a small mark where the profile trace intersects the frame will be drawn. Long Section Frame: This field can be used to display the cross sec tion of the profiles at one frame only. Enter the desired frame number in this field. If a frame number is entered here only the trace of the profiles will be drawn at the other frames. Draw every frames: The interval between sections to be drawn in the Bodyplan view. (E.g. A value of 5 will result in every 5th frame being drawn.) Seam/Butt colour: Display colour of seams and butts. Longitudinal colour: Display colour of longitudinals. Frame colour: Display colour of frame. Grid Spacing: This is used to control the grid spacing if a grid is required.


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Object Selection:

Panels, Seams/Butts, Long trace, Long section, and Curves When Auto selection is ticked, all items of that type will be included in the view, to exclude individual items enter the names in the Excluded objects list. When Auto selection is not ticked, all items of that type will be excluded from the view. To include individual items enter the names in the include objects list. After completing the form select the OK button, the system will then prompt for a view position to be identified on the drawing. Once the view position has been identified use OC to end the command.


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11 Additional Features for Shell Profiles 11.1 Holes 11.1.1 Inserting Holes Once a shell profile has been created, it may be necessary for example to add some holes. Start the function Curved > Model > Create Feature > Hole, the system will prompt the user Indicate Shell Profile click once on the shell profile to be amended. Note: This can be repeated to select more then one shell profile. After the selection select the OK button, the system will display the following menu.

Positions: Where to place the holes. The example shows the first hole cut at 1000mm Fwd FR 53, then cut at frame spacing to 1000mm Fwd of FR60. Axis: Along principle axis holes are positioned Example shows X axis (for Frames). Type: Use drop down menu for Tribon hole selection Example Hole = 100 Dia.

The hole type and size can be selected after selecting menu in the Type drop down field and selecting the OK button. Arbitrary: The name of an object used to select the geometry of the hole, should be entered in the field to the right of the current field. Mirrored: Indicates whether a hole should have its normal appearance or be mirrored about its V axis. The field is irrelevant for all standard hole types.


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Inclination Angle: Angle of hole geometry if left blank, angle will be set to 0 deg. Dist. From Trace: Distance from the trace of the shell profile to the centre of the hole. Example 100mm inboard from the datum edge of the stiffener.

11.1.2 Modifying an Existing Hole If after defining a hole it may become necessary to modify the position, type etc Select Curved > Select > Advanced change the type field to Hole and use the pick button, then select the hole to be amended. Next select Curved > Model > Modify to launch the original menu used to insert the hole in the stiffener(s). Changes can now be entered in to this panel to modify the hole(s) previously created. Note: If a series of holes have been positioned in one command, all holes will be changed as they are grouped together.


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11.2 Notches 11.2.1 Inserting Notches (Limber Holes) Once a shell profile has been created it may be necessary for example to add some notches. Start the function Curved > Model > Create Feature > Notches. The system will prompt the user Indicate Shell Profile, click once on the shell profile to be amended. Note: This process can be repeated to select more then one shell stiffener. After selecting the OK button, the system will now display the following menu. Reference: (From the drop down menu) Co-ordinates: will result in notches at any position specified in the positions field. Normal Seams: Will result in notches at the intersection between the current shell profile and the seam named in the positions field. Refl Seams: Will result in notches at the intersection between current shell profile and the reflected position of the seam named in the Positions field.

Positions: Where to place the notches. If Co-ordinates is selected in the Reference field the positions are to be given as co-ordinate or repetition term in accordance with the setting of the Axis field. If the Normal Seams or Refl Seams is set in the References field then the name of the desired seams intersecting the current shell profile trace should be entered. This field is invalid if Indicate Seam Refs has been activated. Axis: Along which of the principle axes the positions of the holes are defined.


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Type Standard: A valid Tribon notch code should be entered in the field to the right of the current field. Arbitrary: The name of an object, used to define the geometry of the notch, should be entered in the field to the right of the current field. Menu: If this option is selected, and the field to the right left blank, after clicking the OK button the system will display a menu as displayed. Same As: if this option is selected, the field to the right of the current field left blank, after clicking the OK button the system will prompt the user to indicate an existing notch. The system will take this selected notch dimension and type to be used in the creation of a new notch.

Mirrored: Indicates whether a notch should have its normal appearance or mirrored about its V axis. This field is irrelevant for all standard notch types. Example: Select Reference Coordinates Positions FR53.5(1)60.5 Axis X Type R100

This will place a row of 100 Rad notches starting at FR 53.5 spaced equally (frame spaces), to FR 60.5 along the X axis on the datum side of the shell stiffener

This example below relates to notch intersection of shell profile to seam, If seam is repositioned notches will move to suit.

Example: Select Reference Normal Seams v Positions Axis X Type R100

This will place 100 Rad notches at selected intersections between shell profile and seam, along the X axis on the datum side of the selected shell profile.


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11.2.2 Modifying an Existing Notch If, after defining a notch it becomes necessary to modify it, the following steps should be taken. Assuming a drawing is current and the relevant shell stiffener exists in one of the views. Select the notch to be modified using Curved > Select > Advanced. Change the Type field to Notch and use the Pick button. Select the desired notch in the drawing. Start the function Curved > Model > Modify, the system will display the original menu used to define the notch. Modify as required then select OK, if happy with the modifications use Curved > Select > Store and Skip All. Note: If notches are inserted as a multi function, when modifying all notches would be amended.


Issue 01 30.07.07

Page 62 of 68

11.3 Cutouts (WT, NWT, SLOTS) 11.3.1 Inserting Cutouts Once a shell profile has been created it may be necessary for example to add some cutouts. Start the function Curved > Model > Create Feature > Cutout. The system will now prompt the user to Indicate shell profile, click once on the shell profile (larger profile). These profiles will have the cutouts in. Select the OK button when the selection process is complete. The system will now display the following menu. References: Normal profiles: Places the cutouts at the intersection with the named shell profiles in the Positions field.

Refl Profiles: Places the cutouts at the intersection with the reflected position on the named shell profiles in the Positions field. Indicate shell profiles: If this box is checked the system will prompt for interactive indication of the desired intersecting shell profiles rather then a typed shell profile name in the Positions field. Positions: The field should contain the names of shell profiles intersecting the current shell profiles trace. Repetition terms can be used. This field is irrelevant if the Indicate Shell Profiles box has been activated. Cutout Type: This field should contain a valid Tribon Cutout code. Note: For Cutout Type a valid Tribon code will have to be entered manually (there is no drop down menu selection available). After completing the menu as required click the OK button. The system will prompt Indicate, select profiles (smaller Profiles). These profiles pass thro. Note: This process can be repeated to select more then one shell profile. Click OK button when selection process is complete.


Issue 01 30.07.07

Page 63 of 68

11.3.2 Modifying an Existing Cutout If, after defining a cutout it becomes necessary to modify it, the following steps should be taken. Assuming a drawing is current and the relevant shell stiffener exists in one of the views. Select the cutout to be modified using Curved > Select > Advanced. Change the Type field to Cutout and use the Pick button. Select the desired cutout in the drawing. Start the function Curved > Model > Modify, the system will display the original menu used to define the cutout. Modify as required then select OK, if happy with the modifications use Curved > Select > Store and Skip All. Note: If cutouts are inserted as a multi function, when modifying all cutouts would be amended.

12 Curved Panels

12.1 Introduction A Tribon Curved Panel is a collection of created Shell Plates and Shell Stiffeners, which have been split at the unit breaks. The benefit o f collecting all the parts together to make a curved panel is to be found when Hull Production Information is required for the shell. It is much easier to extract manufacturing information against a curved panel then processing individual parts. By defining Curved Panels by the naming convention, it allows an area of shell to be allocated to a specific unit. This is particularly handy for weight and centre of gravity calculations

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140098-Curved Hull Modelling

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