Challenge

Project - 2 - Meshing on the suspension Assembly

AAsad Ali Mukadam28 Jul 2021

Objective: perform 2D and tetra meshing on the model provided and perform necessary connections.

Abstract: in this project, we will take half portion of car rear suspension system here will perform meshing, tetra meshing on different component with 3D,2D,1D elements along with we will also implement the connections for the required areas of bolt , welds, etc,.the components with a uniform thickness with less than 5 mm will be captured by mid surface extraction technique (i.e 2D ELEMENTS ) where the components having more than 5mm thickness will be captured as tetra mesh (i.e 3D ELEMENTS ) and coil spring will capture as 1D elements .

Given data:

Here given data provide are

1.Quality criteria -

Every product which has been produced will go through the set of quality check .if the quality check is fail other steps like boundary condition & applying loads will not be feasible ,

For this project we quality criteria’s is as provided below

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 none 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 element)

S. NO	Quality Criteria	Value
1	Tet-collapse	0.2

Quality critera fr mid surfacing of uniform thickness part which has thickness less than 5mm (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	Min Quad Angle	45
9	Max Quad Angle	135
10	Min Tria Angle	30
11	Max Tria Angle	120

2. CAD model of half rear suspension & wheel system :

The suspension system of a vehicle refers to the group of mechanical component that connect the wheels to the frame or body. A great deal of engineering efforts has gone into the design of suspension systems because of an unending effort to improve vehicle ride and handling along with passenger safety and comfort.

Procedure :

Model include many individual components and after importing the model in ANSA our first step is to seggrecate different component by using iNOT command and set up new PID for each component

Once PID is done we will move to check the geometrical error for each individual component and each component should pass the quality check before moving to mesh

To do this check we have to go in CHECKS available in top ribben bar >> geometry and execute the check

After all components has been check . measure the thickness of component . components which are have less that 5mm thickness is and having uniform thickness is performed by shell mesh and components having more than 5 mm thickness is done by volume mesh

Input quality criteria for each condition

Mesh parameter for each conditions will be as below .

Quality criteria for each condition as below

Once quality criteria is beenentewred we can move to meshing . to do shell meshing we will use auto mid and batch meshing

And surface mesh of all non uniform thickness component including tyre and rim is done by batch mesh each component is meshed individually at a time

After surface meshing of every component is done volume mesh to is define for it in volume mesh module to do this we have to isolate the component having surface mesh and then go to V.MESH MODULE >VOLUMES >DEFINE . an pop up box will pop up select option shown in below image

And press ok to confirm it. It will define volume which can be meshed by using list in here defined volumes are arrange sequentially

In that list select the component for which the volume has be defined and haven’t meshed yet . do right click on it list of options will come out select REMESH.

Remesh can be done with four deferent methods . we use tetra FEM method