REAR SUSPENSION MODEL MESHING USING ANSA

OBJECTIVE

• To perform a tetra mesh for Rear suspension model under specified quality criteria.

METHODOLOGY:

• geometry clean up
• assigning PID
• Meshing as per quality criteria
• creating volumetric mesh
• creating appropriate connection

1. GEOMETRY CLEANUP.

• open the rear suspension model.ansa file
• set the perimeter length and macros under mesh module.
• give topo for the entire component and check usually for any abnormal faces.
• check the geometry for errors with check manager and correct the errors like triple cons,cracked faces,single cons.
• auto -fix the geometry.

2.ASSIGNING RELEVANT PIDS

• Assigning separate PIDS for components like RIM,TYRE,SUSPENSION ASSEMBLY.

1.RIM PART--The rim is the "outer edge of a wheel, holding the tire". It makes up the outer circular design of the wheel on which the inside edge of the tire is mounted on vehicles such as automobiles.

2.TYRE PART--Tyre (or tire) is a circular and ring like part of a vehicle which comes in contact with ground. Tyres are fitted on rims and are filled with compressed air. Since their invention, natural rubber is the most widely used material in manufacturing of tyres.

3.SUSPENSION ASSEMBLY--The suspension system consists of tires, the air in the tires, springs, shock absorbers, struts, arms, bars, linkages, bushings, and joints. The suspension system components are located between the frame of the vehicle and the road.

3.MESHING AS PER QUALITY CRITERIA

Quality Criteria for Tria Elements (Tyre and Rim):

S.No	Quality Criteria	Value
1	Target/Average length	7.5
2	Minimum Length	5
3	Maximum Length	10
4	Skewness	45

Quality criteria for Tria Elements (For other components):

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

Common Quality Criteria for Tetra elements:

S.No	Quality Criteria	Value
1	Tet-collapse	0.2

Meshing can be generated using different mesh methods.

1. SPOT MESH
2. BEST MESH
3. BATCH MESH

a.SPOT MESH--This function automatically meshes Macro and FE shell mesh areas using a special meshing method for Macro-Areas that have 'weld spot' nodes on their surface.

The Spot Mesh algorithm gives better results than the free meshing method and creates the optimum number of shell elements, taking into account the element type already selected and the defined meshing parameters.

b.BEST MESH--This function automatically meshes Macro Areas using all alternative meshing algorithms and keeps only the mesh of highest quality according to QCHECK. The Best function may be applied to selected unmeshed Macros, or to all visible Macros according to the chosen option (Selected or Visible respectively). The 'Re-Generate' option applied to selected Macro Areas where, firstly, erases existing mesh, if any, and secondly meshes them using the Best meshing algorithm. The 'Options' configuration feature enables the user to determine the meshing algorithms to be used. The resulting shell elements are of first or second order shell elements according to the status of the 2nd Ord flag.

C.BATCH MESH--batch mesh generation is a well organized way of meshing complex components.the mesh flow in batch meshing is perfect.feature capturing is perfectly done in batch meshing.

FOR PROPER MESH FLOW THE METHODS USED FOR IMPROVING MESH FLOW ARE

• RECONSTRUCT--Re-construction function is a powerful tool for the creation of a high quality surface mesh. It examines a given mesh and performs re-meshing to correct problematic areas and optimize the overall quality of the mesh according to the mesh parameters. For Geometry Mesh (Macro Areas) all modifications are made on the underlying CAD surface.
• SPLIT--This function splits quadrilateral and triangular shell elements into smaller ones. Element splitting is performed between selected nodes and/or inserted nodes along selected element edges. The function can be applied on individual or groups of shell elements in order to improve the mesh orientation, reduce the number of triangles, or refine locally or globally the mesh of a part. Refer to ANSA User's Guide for a detailed description of the use of the function.
• SWAP--The Mesh>Elements>Swap function rotates the shell edge picked by the user, inside the two shells which have that edge as common.

4.VOLUMETRIC MESH

• define the volume properties using define command under volume mesh module.
• select the volume then list command to remesh the unmeshed volume with tetra rapid or tetra FEM.

5.CREATING CONNECTIONS

• NASTRAAN MODULE>ELEMENT>RBE2>MANY NODES can be used to create a cluster element for bolt holes when there are no different properties defined to parts.

THE LINK FOR MODEL--https://drive.google.com/open?id=1-e0GKtzZ8X5QqIxnnmLLDzl36YD7v6kV