Modelling of an Automotive suspension assembly by using ANSA
Objective:
To mesh the model using ANSA.
Abstract:
The basic idea of meshing is to make calculations at only finite number of points and then interpolate the results for the entire domain(surface or volume).Any continuous object has infinite degrees of freedom and it's just not possible to solve the problem in this format.Finite Element Method reduces the degree of freedom from infinite to finite with the help of descretization or meshing.
Types of elements:
- 1D element:
Used for geometries having one of the dimensions that is very large in comparision to the other two.
Example:Long shaft,rod,beam,column,spot welding,bolted joints,springs etc.
- 2D element:
Used when the two dimensions are very large compared to the other one.2D meshing is carried out on a mid surface of the part.2D elements are planar.Thickness is assigned as additional data.Mathematically,the element thickness specified by the user is asiigned half on the element top and half on the bottom side.So,it is necessary to extract the mid surface and then mesh on the mid surface.
Example:Thin shell plate,plastics etc.,
- 3D element:
Used when all the dimensions are comparable.element types like tetra and hexa are used.
Example: Engine block,crankshaft etc.,
- Other:point element,concentrated mass(conMi),damper or damping co-efficient.etc.,
Automotive suspension model:
Suspension is the system of tires, tire air, springs, shock absorbers and linkages that connects a vehicle to its wheels and allows relative motion between the two.
Meshing:
Geometry CleanUp:
After fixing all the errors,
2D meshing:
Quality Criteria for 2D meshing is,
|
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 |
For thickness below 5mm,Mixed elements are used which are quad & tria,
STRUT BODY:
SHOCK SIDE SUPPORT:
3D meshing:
For Tyre and rim,Quality Criteria given is,
|
S.No |
Quality Criteria |
Value |
|
1 |
Target/Average length |
6.5 |
|
2 |
Minimum Length |
5 |
|
3 |
Maximum Length |
10 |
|
4 |
Skewness |
45 |
Surface Meshing:
Tyre:
Rim:
Solid Meshing:
Tyre:
Rim:
For Other components,
Quality Criteria given is,
|
S.No |
Quality Criteria |
Value |
|
1 |
Target/Average length |
4 |
|
2 |
Minimum Length |
2 |
|
3 |
Maximum Length |
6 |
|
4 |
Skewness |
45 |
|
5 |
Tet Collapse |
0.2 |
Track Bar:
Top strut mount:
Sway Bar Link:
Sway Bar:
Shock movement bar:
Lower Control Arm:
Knuckle Mount:
Knuckle:
Flange Yoke:
Bush:
Bush:
Brake Rotor:
Bracket:
Bottom Strut Mount:
Base Support:
Ball Joint:
3D Meshing:
Track Bar:
Top Strut Mount:
Sway Bar Link:
Sway bar:
Shock movement Bar:
Lower Control Arm:
Knuckle Mount:
Knuckle:
Flange Yoke:
BUSH:
BUSH:
Brake rotor:
Bracket:
Bottom Strut:
Base Support:
Ball Joint:
CONNECTIONS:
Connections deployed are
*Seamweld
*Bolts
Seam weld:
Bolt Connection:
1D Meshing for spring:
Conclusion:
Given Suspension system model is Meshed and connected using connections.
https://drive.google.com/file/d/1PsDSUD2mL5eJL3T2GjUqahw-uuU-KzHN/view?usp=sharing