Project 1 - Meshing of Floor Panel

AIM:-

To mesh the given floor panel for the given quality criterias without any failure in the elements.

Project description:-

FLOOR PANEL GIVEN:-

Procedures for Meshing a 2D component:-

i) Importing the CAD model into ANSA:-

The cad model is imported into the Ansa software by clicking File ---> New command.

ii) Geometry Checks:-

Then the important step is to check the geometry of the CAD model. This will helps us to clear all the surface errors, unwanted cons and also for any dissruptions placed in the CAD model. 

This can be done by giving the command Tools ---> Checks ---> Geometry. And when you check for the geometry, some of the errors will be thrown out by ANSA.

And hence all the CAD models were check for clean geometry and all their surface imperfections are fixed in the geometry check. And once again release all the cons and give Faces ---> Topo.

Then Faces ---> Orient command is used to check the orientation is proper in all the faces of the CAD geometry. 

Some of these errors can be automatically resolved by the ANSA by using the command Right click + Fix in the geometry check dialog box. And some of the errors like unchecked faces will be cleared manually using Faces ---> Delete and Faces ---> New commands.

After when all these errors were fixed, the component is again cheched for geometry and is fine to be cleared all the geometry checks.

Before extracting the Mid surface of the components, its important to measure their thickness. And this can be achieved by using the command Utilities---> Measure. And by chosing the extreme end of two hotpoints we can get the thickness of the geometry.

The midsurface is extracted using the Casting technique and the arears and perimeters were aligned using the Aligh Manager tool if any descrepencies happen.

iv) Fixing Quality criteria and Mesh parameters:-

Once the Mid surface is generated, the CAD model is now ready for the meshnig. And for that the quality criteria for the mesh is defined using the command Utilities ---> Quality Criteria ( or by clicking F11 )

The CAD model is now ready for the meshnig. And for that the quality criteria for the mesh is defined using the command Utilities ---> Quality Criteria ( or by clicking F11 )

Then switch to 'Presentation parameters' tab , In Graphics division put tick mark for Elements% and choose the Details on demand effect as 'More details'

Then choose Utilities ---> Mesh parameters and give the target length as 5 and give the following setup to the meah parameters dialog box.

The quality criteria dialog box will appear as follows and our qiven quality criterias are defined in the dialog box.

Then switch to 'Presentation parameters' tab , In Graphics division put tick mark for Elements% and choose the Details on demand effect as 'More details'

Then choose Utilities ---> Mesh parameters and give the target length as 5 and give the following setup to the meah parameters dialog box.

Then choose Perimeters ---> Length command and choose the entire component and give the target length of the mesh value as 5. (user can choose their own value). The same should be also done for the Macro to get a smooth surface before mesh.

And then the model should be checked for the de-featuring. If we see any cons or hotpoints which will tends to fail the quality criteria, they can be suppress using Macros ---> Cut + Right click and Hotpoints ---> Delete options. Similarly, the minimum length error can be solved by taking peak value of the fillet and by suppressing the nearby cons.

Mid Surfacing:-

For this component the midsurface is extracted using the casting technique. Choose Midsurface ---> Casting. Now in the casting dialogue box give the minimum thickness as 0.5 and set the given target elements. Also in the model, the mesh parameters and the quality critria were loaded and then click on Run. Now the midsurface of the component willl be extracted along with the FE.

After when all the defeaturing works are done, the complex component can be subdivided into batches to obtain better quality mesh and that can be achived by Macros ---> Cut command and then meshing can be applied for the indiviual places. 

And Perimeter ---> Slide option is used to slide the holes in the component and make the perimeters almost parallel, to get an proper mesh in the component.

Finally choose Mesh Generation ---> Best Mesh command and choose the faces to be meshed one by one like a flow.

And hence the Mesh will be generated in the componennt.

In the mesh, the following things should be observed :-

1) The mesh should be smooth and clean

2) Back to Back trias should be avoided

3) Tow opposite trias nearer to eachother should be avoided

4) Tria elements in the fillets should be avoided

5) Tria elements in adjacent to outer edges should be removed

6) Tria elements attached to the hole edges should be avoided

So, after obtaining the mesh, the above things to be taken care and the tria elements can be mostly avoided by using the following commands:-

Elements ---> Split , Elements ---> Swap, Grids ---> Paste These commands are used to move the trias forward and backword and also to split them . Elements ---> Join command is also used to reshape many tria elements and by using these  comannds we can achieve the above conditions and the tria elements can be avoided.

Shell mesh ---> Reconstruct and Shell mesh ---> Smooth commands are also used to obtain the smooth elements in our meshed model.

And hence, when our meshes are failing to fill the quality criterias provided, they can be cleared with the help of the above steps and commands provided.

Align Manager:-

Then the Midsurface ---> Align manager is used to match the areas and perimeters which were came out of their ooriginal midsurface. And Faces ---> Edit is used to sort out some of the unoreferable condition.

MESHED COMPONENT:-