ShipWeight presentation

transcript

ShipWeight presentationShipWeight presentation

BAS engineering AS

February 03 ShipWeight 6.0 presentation – BAS engineering Runar Aasen

BAS engineeringBAS engineering

Located in Ålesund, on the western coast of Norway

Developing and selling ShipWeight and other marine software since 1996

Developing NAPA macros for the ship industry

Participating in weight projects in the Norwegian oil offshore industry

Consulting work on weight control and historical data aquisition.

EÅlesund

EUROPE

The purpose of ShipWeightThe purpose of ShipWeight

Weight controlWeight control

The main purpose of ShipWeight is weight control:

Weight estimation/weight budgetingWeight monitoring/weight trackingStructuring of asbuilt ship data

Optimizing the resources used on weight control

Why weight control?Why weight control?

Avoid contract claims Fulfill general vessel specifications Cost control Documentation (change orders) Input for operations Improve future weight estimation Sale and promotion advantage ”Insurance”

Concept and system architectureConcept and system architecture

System goalsSystem goals Combine the structure of a database with the calculation power of a

spreadsheet

Make structuring and reuse of weight data as easy as possible

Same system for all weight tasks

The user is always in control

Consistency in historical data

Flexibility to be used on a macroscopic as well as a microscopic level

ShipWeight conceptShipWeight concept

Divide the vessel into weight groups. A work breakdown structure (hierarchy) is used for this purpose.

Apply an estimation formula (method) to each weight group. Allow the user to compose the total (cumulative) estimation formula by selecting the weight groups to be calculated.

In each weight group, estimate weight and center of gravity based on past ship data.

The work breakdown structureThe work breakdown structure

The ShipWeight work breakdown structure is a hierarchy of weight groups

More than 300 weight groups are structured into 6 levels

Estimation formulasEstimation formulas

Example - Steel methods: Level 3-4

Methods based on main particulars

Level 5 Methods based on

volume Level 6

Methods based on area, length, and density

Main hull (Level 3) Weight = k•Lpp•B•D•Cb

LCG = k•Lpp VCG = k•Dud

Cargo area (Level 4) Weight = k•V

Deck (Level 5) Weight = k•p•A•t

Technical solutionTechnical solution

ShipWeight contains 2 applications...AsbuiltWeight; for monitoring and tracking of

weights for ships under construction (or already built ships)

DesignWeight; for estimating weight of new ships

…and a common database where data from AsbuiltWeight is made available for estimation in DesignWeight

Database structureDatabase structure

Commondatabase

AS-BUILTapplication

DESIGNapplication

filter

compare

projectdatabases

Work flowWork flow

Design data exported to Asbuilt when entering contract

During construction, Asbuilt data is compared to Design

Asbuilt project is exported to common database upon completion

Continue ”estimation” during Continue ”estimation” during constructionconstruction

Wrong Right

EstimationEstimation

Estimation conceptEstimation concept

When estimating a weight group for a new vessel, all coefficients k from a custom selected set of reference ships are plotted in a graph

A trendline appears in the graph based on regression analysis.

The graph and trendline are tools to select an appropriate coefficient k for the new vessel

Estimation conceptEstimation concept

The selected coefficient k is used to calculate the weight of the specific weight group ( e.g. W = k * L*B*D )

The sum of all weight groups gives the estimation for the total weight of the vessel

Estimation basicsEstimation basics

Select reference shipsPrepare past ship database (common database)Select vessel-type (default = main type)Apply screening criteria in graph

Select ratio coefficient

Execute estimation for weight group

Prepare common ship databasePrepare common ship database

Ship-database of previous projects

Selection of shiptypeSelection of shiptype

Filtering the ship-database with regard to shiptype

The Estimation dialog boxThe Estimation dialog box

The Estimation dialog box consists of graph-, method- and comparison-areas

The Comparison-area ofThe Comparison-area ofthe estimation dialog boxthe estimation dialog box

Limiting values of the plot

The Graph-area of theThe Graph-area of theestimation dialog boxestimation dialog box

The coefficient-line control box

The Methods-area of theThe Methods-area of theestimation dialog boxestimation dialog box

Uncertainty calculationUncertainty calculation

A quantification of the uncertainty can be assigned to each estimation

Parameters in the estimation method gets subject values from the user

The uncertainty value of the coefficient can be (but does not have to be) calculated by the program

The total uncertainty for each weight group and for the total weight is calculated by using successive calculation

MonitoringMonitoring

Monitoring basicsMonitoring basics

Weight items are entered into corresponding weight groups in the WBS and summarized to give the total weight of the group (W).

Calculation method parameter values are entered. ( e.g. W = k * L*B*D )

ShipWeight calculates the coefficient k when exporting to the common ship database

Entering Experience DataEntering Experience Data

Weight items can be entered in by hand or imported from various file formats

It is important to:To establish as many weight groups with 100%

weight (CoG) as possible

Obtain estimation parameters for the methods belonging to the complete weight groups

Entering weight andEntering weight andcenter of gravity by handcenter of gravity by hand

The items dialog box

The sum of weight items forms a weight group

Entering ship parametersEntering ship parameters

The Methods dialog box

Estimation-, Plot- and Comparison- parameters

Overview of parametersOverview of parameters The numerical value indicate the number of missing parameters Estimation- and Plot-parameters must be 0 prior to export

Import of dataImport of data

Data can be imported from ASCII files

Spreadsheets can easily be converted to ASCII format

The imported data must be in correct order

Utilizing project-codesUtilizing project-codes

Possible project-codes:SectionAreaFunctionalModuleDiscipline InstallationWeight statusPhase

Defining code-structuresDefining code-structures Codes can be defined as

a hierarchical structure

Weights are tagged to code-structures either as single weight items in the Items dialog box

…or as groups of weight items in the Codes dialog box

Code structure featuresCode structure features

Lists and reports can be produced according to codes

Area limits can be attached to codes generating visual error checks (code envelopes)

Custom code mapping between the different codes

Additional featuresAdditional features

Additional ShipWeight featuresAdditional ShipWeight features Auto estimation

Weight distribution curve

Move center of gravity (bulk moving weights)

Gyration values

Equipment database

Control against budget

Reporting

Auto estimationAuto estimation

Auto-estimation is a jump-start estimation by extracting coefficients automatically according to settings from the user

An auto-estimation can be adjusted after the automatic estimation

Weight distribution curveWeight distribution curve

To obtain the weight distribution curve, aft and fore values must have been entered for the weight items

The curve can be exported to a number of formats

Move CoGMove CoG

Bulk moving of weight items is easy

Selections can be made according to codes and/or limit restrictions

Longitudinal extent is handled by users choice

Gyration valuesGyration values

Gyration values are calculated from using the Steiner’s theorem, but neglecting the inertia around the single weight item itself

ShipWeight presentation

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