Project - 2 - Meshing on the suspension Assembly

Pre-processing Rear Suspension Assembly using ANSA.

Aim:

• For the given assembly check for the geometrical errors and mesh with given element quality criteria.
• Assemble the components by deploying necessary connections.

Quality criteria feature:

• Generate 3D mesh for tyre and rim by satisfying below mentioned quality criteria.

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

• Generate 3D mesh for remaining components by satisfying below mentioned quality criteria.

S. No	Quality Criteria	Value
1	Target Length	6.5
2	Minimum Length	5
3	Maximum Length	10
4	Skewness	45
5	Tet-collapse	0.2

• Assemble the parts of rear suspension assembly by deploying necessary connections.

S. No	Quality Criteria	Value
1	Target Length	4
2	Minimum Length	2
3	Maximum Length	6
4	Skewness	45
5	Tet-collapse	0.2

Procedure:

• The model provided for the project is rear suspension assembly of vehicle.
• To model is imported to ANSA.

Geometry cleanup:

• The given model is checked for geometrical errors using checks manager.
• The errors displayed is cleared using auto fix and tools from hot points, cons, faces & surfaces.

Midsurface Extraction:

• The mid surface is extracted for parts having uniform thickness less than 5 mm.
• The mid surface of the parts is extracted using tool faces>offset option.

2D Meshing:

• The quality criteria & mesh parameters values are entered.
• The perimeter length value assigned is 4 mm.
• Using spot mesh option each macro area is selected and meshed.
• The quality criteria are achieved by using tools like cut, join, past, Num +/-, reconstruct, smooth, split and swap options.
• The smooth mesh flow is achieved by creating small macro areas and restructuring the mesh.
• To meshing modal.

3D Meshing of Tyre and Rim:

• The quality criteria & mesh parameters values are entered.
• The perimeter length value assigned is 6.5 mm.
• Using spot mesh option each macro area is selected and meshed.
• The quality criteria are achieved by using tools like cut, join, past, Num +/-, reconstruct, smooth, split and swap options.
• The 3D mesh is generated using Tetra Rapid method.

3D Meshing of remaining components:

• The quality criteria & mesh parameters values are entered.
• The perimeter length value assigned is 4 mm.
• Using spot mesh option each macro area is selected and meshed.
• The quality criteria are achieved by using tools like cut, join, past, Num +/-, reconstruct, smooth, split and swap options.
• The 3D mesh is generated using Tetra Rapid method.

Deploying necessary connections:

• The components are assembled using necessary connections such as cluster RBE2 for rigid connections and 2 nodes RBE2 for bolted connections.
• The spring is modelled using CBAR element to deploy connection.
• The rear suspension assembly with connections.

Final result:

Learning Outcomes:

• To do topological clean-up with no errors.
• Assigned separate PIDs for different surfaces and volumes.
• To generate mid surface and volume mesh.
• All the quality criterias and mesh parameters during mesh generation.
• Learned how to improve mesh flow.
• Understood concets regarding connections. Deployed different types of connections.
• Understood all the concepts regarding mid surface generation, volume mesh generation, meshing, connections used for NVH analysis in ANSA.

Conclusion:

In this project, I have generated mid surfaces and volume mesh using different options available in ANSA. To achieve better mesh flow using smooth, reconstruct, swap, paste, move options. Successfully applied different quality criterias and mesh parameters for different parts and cleared off elements during mesh generation. Successfully deployed connections for the rear suspension. Over all I have done pre-processing for rear suspension using ANSA.

Drive line:

https://drive.google.com/drive/u/0/folders/1PZo5eSbx0XWSVRxNP-FTW_l-Huz2I83A