Project - 2 - Meshing on the suspension Assembly

Aim:  Meshing on the suspension Assembly

Procedure: 

• Import the given file in ANSA file 
• Select geometry check
• If any errors found clear them by performing required actions
• According to criteria mesh the components 

Tyre

• Select tyre component and and give mesh parameters
• Give mesh criteria and apply mesh on the PID region
• After mesh is generated check for off elements and clear the off elements
• After all failing elelments are cleared now apply volume mesh
• First define the visible PID object
• Then apply tetra rapid and select the part
• Give collapse criteria as 0.2
• And also check for failing elements

Rim

• Follow the same procedure as mentioned for tyre

Suspension Assembly

• Check whole parts and apply geometry check and remove the errors that are popped up
• Check each part and apply required meshing methods
• If thickness is less than 5mm then go for 2d meshing
• If thickness is greater than 5mm and having uniform thickness then try for 2d meshing
• If thickness is greater than 5mm and having non-uniform thickness go for 3d meshing 
• According to above methods give mesh parameters and mesh criteria and apply mesh on components
• Create new PID for required components
• After surface meshing is done for 3d mesh method and all off or failing elements  are eliminated now go for volume meshing.
• First give define for part and then apply volumetric mesh and apply tetra rapid method and also eleiminate failing componets if appeared
• This is how 3d mesh is done for components
• When it comes for 2d meshing components in whole file, only 2 parts are selected i.e shockabsorber bottom cylinder and hinge where weld connection shoould be given
• Generate midsurface for thos components and apply mesh as given and eleiminate the failing elements and give thickness for them
• Go to mesh parameters and select convert shell as solid
• This is how 2d meshing is done

Connections

• In whole assembly connections for parts should be given for better simulations
• For tyre and rim rigid connection is given 
• Go to Nastran deck select RBE2 in elements and select the nodes for which rigid connection should be given
• Apply the same method wherever required
• Suspension arm end requires bolted connection for that first select the one whole nodes and give rigid connection and  for other open whole give rigid connection
• Later go to RBE2 and select two nodes and select the two master and and apply
• This is how bolted connection is given
• For spring 1d connection should be given
• For spring 1d connection first extract middle curve for the  part
• Later connect all curves to one curve
• Find COG for this curve
• Select Pbar in elements in nastran deck and select curve and COG point and give element size as 3mm
• Give specified PID for this 1d element and go to mesh criteria manager and select 1d elements as solid
• After that give rigid connection for Pbar and plate for which spring is connected , do same method at bottom side of spring also
• Later weld connection is to be givven for hinge and damper 
• Here first convert the cone of hinge to curve 
• The con that is selected should be the place where weld is captured
• Covert the curve that is created into seamline weld through connection manager
• And go to connection manager and select seam line and press middle mouse  button
• Now select tha parts for which weld should be captured and and also give weld type
• The weld type should be overlap shell and give search distance
• Give new PID as required
• Also give weld width and step lenght that is required
• Select apply and select realise now we can see the weld connection is given 

Symmetry

• After all mesh methods are performed and all failing elements are removed apply symmetry option and select the required components
• First go to tranform and select copy and go to symmetry and slect 3nodes  method
• Later select the 3 nodes from where symmetry should be performed
• Now select the components from where symmetry is done and having connected parts 
• Now try deleting the common parts and again create the face so that it will be as a single componet
• Now for the edited component mesh will be erased so remesh fo that part and again given mesh paramters 
• This is how whole meshing, connections and symmetry is given

Learning outcomes

• Learnt how to select mesh methos for different components
• Learnt how to give connection and type of connection 
• Learnt why meshing shouldbe done and why failing elements should be eliminated

Conclusion

• Midsurface extraction and meshing for required components is done
• 3d meshing and volume meshing is done 
• 1d ,2d connections are also given at required places