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MSC.Nastran 105 Exercise Workbook 12-1
WORKSHOP 12
The Effect of MultipleCoordinate System
X
Z
P
X
Y
99
Objectives:
Create a cantilever beam model
Assign different coordinate systems as refferenceand displacement coordinate system
Run an MSC.Nastran Linear Static analysis
Modify reference and displacement coordinatesystem
Compare the analysis results
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12-2 MSC.Nastran 105 Exercise Workbook
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WORKSHOP 12 The Effect of Multiple Coordinate System
MSC.Nastran 105 Exercise Workbook 12-3
Model Description:
The goal of this example is to examine the effect of
different coordinate systems. A linear static analysis of acantilever beam will be performed using multiple
coordinate systems.
We will examine the following 3 casesCase 1
Ref. coord. =
Disp. coord. =
Case 2
Ref. coord. = 99
Disp. coord. =
Case 3
Ref. coord. = 99
Disp. coord. = 99
Question:For case 3, the displacement vectors have been shifted to
T1 column. However, are the values correct? What about
the SPC force ?
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12-4 MSC.Nastran 105 Exercise Workbook
Figure 12.1- Grid Coordinates and Element Connectivities
Figure 12.2- Loads and Boundary Conditions
1 2 3 4 5
1 2 3 4
40
[23, 34, 0]
50
1
2
.15
.15
.1
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WORKSHOP 12 The Effect of Multiple Coordinate System
MSC.Nastran 105 Exercise Workbook 12-5
Suggested Exercise Steps:
Define a local coordinate system 99
OriginPoint on Axis 3 Poin of plane 1-3
Generate a finite element representation of the cantileverbeam. (i.e., The nodes (GRID) and element connectivitives(CBAR).
Use the basic coordinate system, coord. , as the referenceand displacement coordinate systems.
Define material (MAT1) and the element (PBAR)properties.
Apply the fix boundary constraints (SPC1) at the left tip.
Apply the concentiated force of 50lbs (FORCE) at the freeend.
Prepare the model for linear static analysis (SOL 101).
Review the results.
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12-6 MSC.Nastran 105 Exercise Workbook
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WORKSHOP 12 The Effect of Multiple Coordinate System
MSC.Nastran 105 Exercise Workbook 12-7
Case 1
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12-8 MSC.Nastran 105 Exercise Workbook
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WORKSHOP 12 The Effect of Multiple Coordinate System
MSC.Nastran 105 Exercise Workbook 12-9
Case 2
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12-10 MSC.Nastran 105 Exercise Workbook
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WORKSHOP 12 The Effect of Multiple Coordinate System
MSC.Nastran 105 Exercise Workbook 12-11
Case 3
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12-12 MSC.Nastran 105 Exercise Workbook
