Project - 2 - Meshing on the suspension Assembly

Project - 2

Aim: - Meshing on the suspension Assembly

Objectives: - For the given assembly, 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 a Symmetry command to reflect the half-finished model to the other side.

Common Note:

1. Use Volume mesh for Tyre and Rim with below Quality criteria. (Use Tria Element)
2. Use mid-surface only when the thickness is uniform and less than 5 mm. (Use Mixed elements)

Quality Criteria for Surface Meshing of Tyre and Rim (Element type: Tria) : 

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

 

Quality criteria for Surface Meshing of Non-Uniform thickness components other than Tyre and Rim (Element type: Tria) :

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

 

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

 

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

 

Procedure: -

1. Firstly, import the given model.

2. Perform the topology in the given model.

3. After that, check the geometrical errors and fix them.

Command: {Tool>>Checks>>Geometry>>Execute}

Green tick in status bar shows all the geometrical errors are fix.

4. Now, take mid-surface by using offset or skin methods and set PID simultaneously.

As mentioned in note, we have to take mid-surface only for following parts.

Command: - {Topo>>Faces>>offset or skin>>select surface}

I. Set PID and assign the thickness.

Command: - {Topo>>Faces>>Set PID}

5. Now, mesh the given component with good mesh flow and quality criteria.

Use the mixed type element only.

 

 

 

 

6. After that, mesh the Tyre & Rim with quality criteria.

Use element type tria only.

 

 

 

 

7. Now, mesh the other remaining parts with quality criteria.

Used element type Tria only.

 

 

 

Command: - {Mesh>>Mesh generation>>spot}

 

8. Now, represent a solid spring with 1D CBAR element.

I. Generate a middle curve for the spring by using the middle option in the curves.

Command: - {Topo>>curve>>middle}

 

II. Create a COG point for the curve to define the orientation.

Command: - {Topo>>point>>COG}

III. After that, select the CBAR element.

IV. Select the curve and click the middle mouse button.

V. select the orientation node.

Select the COG point and click the middle mouse button.

VI. Specify element length 3 mm.

 

VII. After that, create new PBAR property.

VIII. Define Area by giving diameter of spring. i.e., Cross-section radius of a spring.

IX. Select Area tab and press the shift + ?. It will open the section parameter.

 

 

X. 1D bar elements will be created.

XI. To see the representation of 1D bar elements as 3D (Solids).

XII. Open the quality criteria and then select presentation parameter.

XIII. Select the Line elements cross-section draw mode: as solid.

 

9. Now, create seam weld or rbe2 connections.

I. Create seam weld connection.

Command: - {Topo>>curve>>cons2curve}

II. After creating a curve, convert that curve into a seam line.

Command: - {Assembly>>convert>>curve>>Seam line}

 

 

III. Now assign that seam line curve into connection for seam weld connection.

Command: - {Assembly>>connection manager>>select curve>>enter}

 

 

IV. Now, select the part P1 & P2.

V. Go to the P2 tab and press right click and then press fn + F1 button and select part.

VI. Create weld property [shift + ?] in weld property selection.

 

 

VII. After that, click on apply and then realize.

RBE2 connections: -

Command: - {Modules>>Nastran>>element>>RBE2>>many nodes>>select nodes}

 

I. Create a rbe2 connection wherever requires.

 

10. Now, mesh the entire FE mesh into the volume mesh.

Command: - {Modules>>Vmesh>>define}

I. Create a new PSOLID property.

II. Check the Tet collapse and volume meshing is generated successfully or not.

III. Do this same procedure for all other remaining parts.

PSOLID properties: -

 

11. Now, comes to the last procedure of this project.

I. Reflect model to the other side.

Command: - {Utilities>>transform>>copy>>select all>>enter}

 

II. Copy entities will open, then select symmetry and mirror 3 point plane.

 

III. Select X1, X2 and X3.

 

IV. Apply, ok, then finish.

 

Geometry mode –

FE mode –

Volume Mode -

 

Final Model: -

  Learning Outcomes: -

1. Learn about volume meshing.

2. Learn about how to model suspension spring.

3. Learn about how to reflect model to the other side.

Conclusion: -

In this project 2, we mesh the entire parts with different quality criteria and mesh parameter, assign them thickness too, then create volume meshing and reflect entire model.