Project - 2 - Meshing on the suspension Assembly

OBJECTIVE:

To mesh and create connections in the given suspension assembly as per the quality criteria given below using ANSA.

PROCEDURE:

1. The given model is imported into the ANSA software and the geometry checks are run. This is shown in the figure below.

2. The errors are fixed using the auto-fix option. If the errors are not fixed using it, then the geometry is cleaned up using the tools present in the TOPO module. The cleaned geometry is shown in the figure below.

3. The tire and rim parts are isolated from the geometry to mesh as per the quality criteria given above. The 3D mesh is generated from the 2D mesh using the Tetra Rapid and Tetra FEM options. This is done by creating volumes. The final meshed model is shown in the figure below.

4. The part with a thickness less than 5 mm is measured and isolated from the full geometry. This is shown in the figure below.

5. Now, the offset option under the TOPO module is used for the extraction of the middle surface of this geometry. The final extracted middle surfaces are shown in the figure below.

6. Under the MESH module, the element type given is mixed and the quality criteria are changed as per the objective. The middle surface has meshed without any off elements. This is shown in the figure below.

7. Now, for the rest of the geometry with a thickness of more than 5mm, each part is isolated and meshed in accordance with the quality criteria given in the objective. The final meshed model is shown in the figure below.

6. For the spring, a middle line is created using the curves option under the TOPO module. After this step, it is converted to the PBAR element using the CBAR option present under the NASTRAN deck. The PBAR element representation is shown in the figure below.

7. The final meshed model is shown in the figure below. Some surfaces remain unmeshed. These are the surfaces where the middle surface is taken and meshed. So, these can be ignored.

8. A seam weld is connected to the following parts using Overlap Shell. This is shown in the figure below.

9. For the rest of the areas, cluster RBE2 and two noded RBE2 are used to give the necessary connections. The connections are shown in the figure below.

10. After giving all the connections, go to transform>>Copy>>Symmetry>>Use Default Plane>>Accept. The half model reflected in the default symmetry plane which is shown in the figure below.

11. The final meshed and connected model is shown in the figure below.

LEARNING OUTCOMES:

1. Topological cleanup of geometry is learned.

2. Midsurfacing and mesh generation techniques are learned.

3. Mesh refinement in accordance with quality criteria is learned.

4. Generation of PBAR elements for spring is learned.

5. Connections such as RBE2, seam weld, etc., are learned.

CONCLUSION:

The mesh is generated in the given geometry as per the quality criteria given in the objective. Suitable connections are made. Hence, all the objectives are satisfied.

Drive Link: https://drive.google.com/file/d/1kIKoIbPS0GgpH5-nobfPhxXAfSXueqLW/view?usp=sharing