Project - 2 - Meshing on the suspension Assembly

OBJECTIVE : 

• To check for the geometrical errors and mesh with the given element Quality criteria.
• After meshing the component the thickness has to be assigned for mid surfaces.
• Use tetra elements to model non-uniform thickness components.
• Also use Appropriate connections to connect the component as suggested in the Project-2 video (Use PBAR elements to model suspension spring).
• At last perform Symmetry command to reflect the half finished model to the other side.

PROCEDURE:

Import the model

The model has 3 Parts

• TYRE
• RIM
• SUSPENSION SYSTEM

Check >> Geometry >> Execute

• After clean up models are set with their PID

• Topo Cleanup has to be performed on the parts
• The parts are to be meshed with their respective quality parameters

S.No	Quality Criteria	Value
1	Target/Average length	6.5
2	Minimum Length	5
3	Maximum Length	10
4	Skewness	45

For tyre and rim we mesh using solids

• Quality criteria for Surface Meshing of Non Uniform thickness components other than Tyre and Rim.

S.No	Quality Criteria	Value
1	Target/Average length	4
2	Minimum Length	2
3	Maximum Length	6
4	Skewness	45

This is a quality needed to be use for parts other than tyer and rim for meshing. 

• Quality Criteria for Volume meshing of all Non Uniform thickness components (Element type: Tetra Elements): 

S.No	Quality Criteria	Value
1	Tet-collapse	0.2

This is the quality given for volume meshing.

• Quality criteria for Mid surfacing of Uniform thickness part which has thickness less than 5 mm (Element type: Mixed elements) :

S.No	Quality Criteria	Value
1	Target/Average length	4
2	Minimum Length	2
3	Maximum Length	6
4	Aspect	3
5	Warpage	15
6	Skewness	45
7	Jacobian	0.7
8	Minimum Quad Angle	45
9	Maximum Quad Angle	135
10	Minimum  Tria Angle	30
11	Maximum Tria Angle	120

This given quality needed to be used to the mid surface only when the thickness is uniform and less than 5 mm.

Tetra Meshing

CONNECTIONS :

• RBE2 connection is commonly used.RBE2 >> nodes >> create the conncection and ok
• Nodes can be selected in may ways by using NODES OR ENT options in FEATURE SELECTION OPTION. 

SEAM WELD CONNECTIONS:

To perform seam welding connections, curve using the CONS. To curves by using cons we have to use CONS to CURVES option in CURVES which is in TOPO.

convert the curve to SEAM LINE >>  CONVERT >> ASSIEMBLY OPTION.(Assembly

After the SEAM LINE >> ASSEMBLY> select the seam line created >> select the two parts and assigne them SHIFT+? when the seam connections need to be created >> select OVERLAP SHELL give the different info like distance ,width and assigne different PID >> and then realize the connection for seam weld connection to be observed.

In the suspension assembly ,we have a spring in which PBAR connection is to be created.To create CBAR CONNECTION >> CURVE MIDDLE >> CURVES >> TOPO MODULE.

Connect

After the curve is created we have to create the CBAR CONNECTION by using CBAR option in ELEMENTs which is in NASTRAN DECKS.

NASTRAN DECKS

STEP 8:

After model completed,  REFLECT the model by using SYMMETRY command.

To perform symmetry first go to UTILITIES< TRANSFORM

MODEL :

CONCLUSION :

Meshing on the give suspension assembly is done as per the objective in which connections are placed in required spots and satisifies the criteria