nas120 ws10 fairing
TRANSCRIPT
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WORKSHOP 11
SPACECRAFT FAIRING
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Workshop Objectives Learn to use Groups and Lists
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Problem Description In this exercise, a spacecraft fairing will be constructed. Curves and
surfaces will be used to define the fairing geometry. The finiteelement model will consist of 2-dimensional elements with 1-dimensional elements applied at various edges of the geometry. The
1-dimensional elements will represent stiffeners for the structure.
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Suggested Exercise Steps
1. Create a new database called fairing.db and set the model preferences.2. Create the model geometry.
3. Create the mesh seeds for the model.
4. IsoMesh the model using Quad4 topology.
5. Check the free edges, equivalence the model, and then check the freeedges again.
6. Create a new group called FEM that contains only the finite elemental
model. Then post only the FEM group.
7. Create two material properties, alum_1 and alum_2.
8. Create two fields, one for temperature and the other for thickness.
9. Create element properties.
10. Create a temperature boundary condition.
11. Create a series of lists containing elements that satisfy these following
requirements: 1) the elements are made up of the alum_1 material, 2) theelements are greater than 0.98 in thickness, and 3) the elements have a
temperature greater than 230.0 degrees.
12. Intersect lists a and b to produce a list of elements that satisfy the first two
conditions.
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Suggested Exercise Steps (Cont.)
13. Create another list that satisfies the third condition.14. Intersect the new list with the other list to produce a group of elements that
satisfy all three conditions. Then, place these elements in a separate
group.
15. Post the group containing the elements produced in step 14.
16. Create 2 new groups, each containing elements with different property sets.
17. Change the display attributes for each group.
18. Post each group separately, then post both groups together.
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Step 1. Create New Database
Create a new database and set the model
preferences.
a. File: New.
b. Enter fairing for the File Name.
c. Click OK.
d. Set the Tolerance to Default.
e. Make sure that theAnalysis Code
andAnalysis Type are set to
MSC.Nastran and Structural,
respectively.
f. Click OK.
a
b c
d
e
f
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Step 2. Create Model Geometry
Create the points and curves that
represent the outline of the fairing.
a. Geometry: Create / Point / XYZ.
b. Enter [30 0 0] under PointCoordinates List and clickApply.
c. Geometry: Create / Curve / XYZ.
d. Enter and [50 40 0]
under Vector Coordinates List and
Origin Coordinates List,
respectively.e. ClickApply.
f. Click on Cycle Show Labels icon.
g. Click on Point Size icon to increase
the point size.
h. Geometry : Create / Curve / Point.
i. Click on Point 1 under Starting
Point List and click on Point 2 for
Ending Point List.
a
b
c
d
e
h
i
j
f g
S 2 C M d l G (C )
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Step 2. Create Model Geometry (Cont.)
Illustrated here are curves thatrepresent the basic geometry for the
fairing. These curves will be revolved
360 in order to get the final model.
St 2 C t M d l G t (C t )
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Step 2. Create Model Geometry (Cont.)
Create the fairing by revolving
curves 1 and 2 about the fairings
vertical center line.
a. Geometry: Create /
Surface / Revolve.
b. Enter Coord 0.2 for Axisc. Enter 360 for the Total
Angle.
d. Click on Curve List.
e. Click on Curve 1, then click
on Curve 2.
f. Viewing: Angles.
g. Enter 30 0 0 under Angles.
h. ClickApply.
a
b
c
d
e
f
g
St 2 C t M d l G t (C t )
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Step 2. Create Model Geometry (Cont.)
Change the display
preferences in order to get a
clearer visual of the model.
a. Display: Geometryb. Enter 3 for Number of
Display Lines
c. ClickApply, then
Cancel.
a
b
c
Step 3 Create Mesh Seeds
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Step 3. Create Mesh Seeds
Create a finite element mesh so
that 4 node Quad elements are
created every 10 along the
circumferential edges.
a. Elements: Create / Mesh
Seed / Uniform.
b. Select Number of
Elements and enter 36
for the Number.
c. Click on Curve List.
d. Select the top
circumferential edge of
the fairing (Surface 1.3).
a
b
c
d
Step 3 Create Mesh Seeds (Cont )
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Step 3. Create Mesh Seeds (Cont.)
In the vertical direction (y-direction),
define a smoothly transitioning mesh
density. The elements along the top of
the cylinder are 2.5 times as large as
those along the bottom edge (taperedend) of the fairing.
a. Elements : Create / Mesh Seed /
One Way Bias.
b. Select L1 and L2 and enter 7 and
10 for L1 and L2, respectively.
c. Click on Curve List and selectCurve 1.
d. Elements : Create / Mesh Seed /
One Way Bias.
e. Select L1 and L2 and enter 4 and
7 for L1 and L2, respectively.
f. Click on Curve List and selectCurve 2.
a
c
b
d
e
f
Step 4 Create a Mesh for the Model
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Step 4. Create a Mesh for the Model
Now that the mesh seeds have
been created, mesh the model
using Quad4 topology.
a. Elements: Create / Mesh /
Surface.
b. Select Quad, IsoMesh,
and Quad4.
c. Rectangular pick the
entire model and click
Apply.
d. Remove the display lines
by clicking the on the
Display lines icon.
e. Remove the labels by
clicking the Cycle Show
labels icon.
f. Decrease the point-sizeby clicking on the Point
Size icon.
a
b
c
e df
c
Step 4 Create a Mesh for the Model (Cont )
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Step 4. Create a Mesh for the Model (Cont.)
Mesh the horizontal
(circumferential) edges of each
surface with two-noded bar
elements.a. Click on Plot/Erase icon.
b. Click on Erase under
FEM.
c. Click OK.
d. Elements: Create / Mesh
/ Curve.
e. Set Topology to Bar2
f. Shift select the 3 curves
(as indicated).
g. ClickApply. c
d
e
f
g
a
f b
Step 5 Observe the Free Edges
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Step 5. Observe the Free Edges
Check the free edges of the
model, equivalence, and then
check the free edges again.
a. Click on the Plot/EraseIcon.
b. Under FEM, click Plot.
c. Elements : Verify /
Element / Boundaries.
d. Select Free Edges
under Display Type.
e. ClickApply.
f. Elements :
Equivalence / All /
Tolerance Cube.
g. ClickApply.
h. Repeat steps c
through e.
c
d
e
f
g
a
b
Step 6 Create a New Group
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Step 6. Create a New Group
Replot the FEM and create a
group called FEM containingonly the finite element model.
Post only this new group to the
viewport.
a. Group: Create
b. Enter FEM for the New
Group Name.
c. Select Unpost All Other
Groups.
d. Change Group Contents
toAdd All FEM.
e. ClickApply.
a
b
c
d
e
Step 7 Create Material Properties
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Step 7. Create Material Properties
Create the first material for the
model. Material alum_1 will be
applied to the top(cylindrical)
portion of the fairing.
a. Materials: Create /
Isotropic / Manual Input.
b. Enter alum_1 for the
Material Name.
c. Click on Input
Properties.
d. Select Linear Elastic and
enter 1.05E7, 0.33, and
2.6E-4, for Elastic
Modulus, Poisson Ratio,
and Density, respectively.
e. Click OK.f. ClickApply.
d
e
a
b
c
f
Step 7. Create Material Properties (Cont.)
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Step 7. Create Material Properties (Cont.)
Create the second material for
the model. Material alum_2 will
be applied to the bottom
(tapered) portion of the fairing.
a. Materials: Create /
Isotropic / Manual Input.
b. Enter alum_2 for the
Material Name.
c. Click on Input
Properties.d. Select Linear Elastic and
enter 1.18E7, 0.33, and
2.4E-4, for Elastic
Modulus, Poisson Ratio,
and Density, respectively.
e. Click OK.
f. ClickApply.
d
e
a
b
c
f
Step 8. Create Fields
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p
Define a field that represents the
varying thickness.
a. Fields: Create / Spatial /
PCL Function.
b. Enter thickness for the
Field Name.
c. Enter 1.5-Y/160 for the
Scalar Function and click
Apply.
a
b
c
Step 8. Create Fields
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Plot the function defined in
the field.
a. Field: Show
b. Select thickness as
the field to show.
c. Click Specify Range.
d. Enter 160.0 for the
maximum and 20 for
the number of points.
e. Click OK.
f. ClickApply.
d
e
a
b
c
f
Step 8. Create Fields
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Delete the plot.
a. XY Plot: Delete /
XYWindow
b. Select XY ResultWindow.
c. ClickApply.
d. Choose Yes to delete
the result window.
a
b
c
d
Step 8. Create Fields
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Define a field that represents the
varying temperature distribution.
a. Fields: Create / Spatial / PCL
Function.
b. Enter temperature for the
Field Name.
c. Enter 200.0-(150.0/160.0)*X
for the Scalar Function and
clickApply.
a
b
c
Step 8. Create Fields
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Plot the function defined in
the field.
a. Field: Show
b. Select temperature
as the field to show.
c. Click Specify
Range.
d. Enter 50.0 for the
maximum and 10 forthe number of
points.
e. Click OK.
f. ClickApply.
bd
e
c
a
f
Step 9. Create Element Properties
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Create two element properties
which include the material
definitions and varying thickness.
a. Properties: Create / 2D /Shell.
b. Enter prop_1 for the
Property Set Name.
c. Click on Input Properties.
d. Click on the Select Material
icon.e. Select alum_1 from the
Select Material list box.
f. Click on the Front view
icon.
f
d
e
a
b
c
Step 9. Create Element Properties (Cont.)
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Finish creating the first property set.
a. Set the thickness type to
Element Nodal and click on the
Select Field icon.
b. Select thickness as the Scalar
Spatial Field.
c. Click OK.
d. Click on Select Members and
click on the Shell Element icon.
e. Select the top(cylindrical) portionof the fairing by dragging a box
around the desired section (as
indicated on next page).
f. ClickAdd , thenApply.
a
d
b
c
d
f
f
Step 9. Create Element Properties (Cont.)
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Illustrated here is the desired
application region for the first
property set.
Step 9. Create Element Properties (Cont.)
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Create the second property set.
a. Properties: Create / 2D / Shell.
b. Enter prop_2 for the Property
Set Name.c. Click on Input Properties
d. Click on the Select Material
Icon.
e. Select alum_2 from the
Existing Materials.
f. Click on the Select Field Icong. Select thickness from the
Existing Fields box.
h. Click OK.
i. Click on Select Members and
select the bottom (tapered)
portion of the fairing bydragging a box around it(as
indicated on next page).
j. ClickAdd, thenApply
d
f
eg
h
a
b
c
i
j
Step 9. Create Element Properties (Cont.)
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Shown here are the
elements for the
desired application
region of the second
property set.
Step 10. Create Temperature Boundary Conditions
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Define the models varying temperature
distribution.
a. Loads/BCs: Create /
Temperature / Nodal.
b. Enter temp for the New SetName.
c. Click on Input Data.
d. Click on Temperature and
select temperature from the
Spatial Fields.
e. Click OK.f. Click on Select Application
Region.
g. Under Geometry Filter, select
FEM.
h. Click onAppl icat ion Region
and select the entire model.
i. ClickAdd, then, OK
j. ClickApply.
d
e
g
h
i
a
b
c
f
j
Step 10. Create Temperature Boundary Conditions (Cont.)
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Turn off the temperature labels
in order to get a better
visualization of the model.
a. Display: Load/BC/Elem.
Prop
b. Under Loads/BCs
remove check under
Temperature.
c. ClickApply, then
Cancel.
a
b
c
Step 11. Create Lists
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Use Lists and groups to filter thengroup the quad elements that have thefollowing
attributes:
Material : alum_1
Thickness : > 0.98
Temperature : >230.0
a. Tools : List / Create
b. FEM / Element / Attribute
c. UnderAt tr ibute, selectMaterial.
d. Under Existing Materials,select alum_1.
e. Set the Target List to A andclickApply.
a
b
c
d
e
The contents of List Acompose of elements that
satisfy the first condition;
they are made up of the
alum_1 material.
Step 11. Create Lists (Cont.)
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Define List B to include only the
Quad elements that have a
thickness greater than 0.98.
a. Properties: Show.
b. Under Existing
Properties, select
Thickness.
c. Set Display Method to
Scalar Plot.
d. Select Current
Viewport, select FEM
and clickApply.
a
b
c
d
Shown above is a fringe plot the model by thickness. Those
elements that are thicker than 0.98 will be included in the next
list.
Step 11. Create Lists (Cont.)
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After defining the list parameters,
add the elements greater than 0.98
in thickness to list B.
a. Tools: List / Create
b. FEM / Element / Attribute.
c. UnderAttribute, select
Fringe Value.
d. Under Fringe Tools, select
default_Fringe.
e. Change the inequality to >
and enter 0.98.
f. Select B for the Target
List.
g. Click onApply.
a
The contents of List B
include all elementsthicker than 0.98.
b
c
d
e
f
g
Step 12. Intersect Lists
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Intersect Lists A and B and
replace the contents of List A
with the elements found in the
intersection.a. Tools: List / Boolean
b. Click on the Intersect
icon.
c. Click on Replace A.
The new List A is
composed of elementsthat satisfy both
requirements: they are
made up of alum
a
b
c
Step 13. Create More Lists
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Perform a final classification of the
elements. Isolate those elements
that satisfy the third condition of the
applied temperature load > 230.0.
a. Loads/BCs: Plot Contours /Temperature.
b. Select temp from the
Existing Sets.
c. Select Temperature under
Select Data Variable.
d. Select the FEM group andclickApply.
a
b
c
d
Step 13. Create More Lists (Cont.)
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Clear the contents of List B and add thevalues obtained from the final classification.
a. Tools: List / Create.
b. FEM / Element / Attribute.
c. Select Fringe Value and
default_Fringe for Attribute and Fringe
Tools respectively.
d. Change the inequality to > and enter
230.0.
e. Select B for the Target List.
f. Click on Clear on the List B form
g. ClickApply on the List Create form.
a
b
c
d
e
f
g
Step 14. Intersect Lists Again
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Lists A and B will be intersected
again to create a List C. This list
will contain the elements that
satisfy all three conditions. Thecontents of List C will then be
placed into a new group called
common_quads .
a. Tools: List / Boolean
b. Click Clear.
c. Click on the Intersecticon (It may be necessary
to click on any of the
other icons first).
d. Click onAdd To
Group
e. Enter common_quadsfor the Group Name.
f. ClickApply, then Cancel.
a
b
c
d e
f
Step 15. Post Group
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Post the common_quad
group. This is the group of
elements that satisfy allthree of the conditions
defined earlier.
a. Group: Post
b. Select the
common_quads
group under SelectGroups to Post.
c. ClickApply, then
Cancel.
d. Click on the Iso 1
view icon.
a
b
c
d
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Step 16. Create Two New Groups
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Create two new groups, prop1_group
and prop2_group .Then, change the
display attributes for each group.
a. Click on the Reset Graphics icon.
b. Group: Create
c. Create / Property Set.
d. Enter prop1_group for the Group
Name.
e. Select prop_1 under Property
Sets.
f. ClickApply.
g. Repeat steps b through f entering
prop2_group for the Group Name
and selecting prop_2 under
Property Sets.
a
b
c
d
e
f
g
Step 17. Change the Display Attributes
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Set the entity coloring and labeling to Group mode andthen change the display attributes for each of the two
new groups.
a. Display: Entity / Color / Label / Render
b. Select Group under Entity Color and Labeling.
c. Select the prop1_group under the Target
Group(s).d. Select HiddenLine for the Render Style and
select dark blue for the Shade Color.
e. ClickApply.
f. Select the prop2_group for the Target
Group(s).
g. Select Wireframe for the Render Style andselect red for the Shade Color.
h. ClickApply, then, Cancel.
a
b
c
d
e
f
g
h
Step 18. Post Groups
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Change views and post the
prop1_group.a. Click on the Iso 3 view
icon.
b. Group : Post
c. Under Select Groups to
Post, select prop1_group .
d. ClickApply.
a
b
c
d
Step 18. Post Groups (Cont.)
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Post only the prop2_group.
a. Group: Post
b. Under Select Groups to
Post, selectprop2_group .
c. ClickApply.
a
b
c
Step 18. Post Groups (Cont.)
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Post both the prop1_group
and the prop2_group.
a. Group: Post
b. Under Select Groups
to Post, select both
prop1_group and
prop2_group .
c. ClickApply.
a
b
c
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