Project 1 - 2D meshing on the instrumental Panel using ANSA

Objective:

• To extract the midsurface of the given instrument panel without geometrical errors and mesh the panel with given quality criteria and assign the thickness as required.

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
12	Tria Percentage	15

Procedure:

• First we have to import model and then do topo for connect all the free edges to connect double cons using faces>topo in topo module. Now check the geometry for errors using checks>geometry and now fix all th errors by single shot by right click and fix.

• Some areas have cracked faces. you have to delete the crack areas and create new surface using faces>new.

• Now measure the thickness of the component and ribs using measure tool, after orienting the component using Faces>orient>visible.

• Now the model has ready to do midsurface extraction. we have different kind of tools to extract midsurface.
• Now we use offset tool to get midsurface of the major areas using Faces>offset.

• Now we have to take midsurface for various ribs with different thickness using middle option especially used for ribs area by using Faces>middle. Select the one side and either side of the rib to take midsurface.

• Now take mid for dog house, Here we use cross pattern to capture the midsurface of the doghouse because the dog house solid pattern(hollow inside). It didn't have a definite thickness. So we have to capture the dog house by creating curves using cons2curves tool (curves>con2curve) in topo deck. If the cons are not available just create the curves using curves>create to get cross pattern curve.

• Now Generate the midsurface using faces>new tool in topo deck.

• After extract the midsurface for ribs. Now we have to extend the ribs using Faces>extend. This tool is used to extend edge to the target face.

• Here we have different kind of thickness for ribs and main surfaces. So we have to assign different PID's for component by using Faces>set PID. Separate the ribs as per thickness and set PID for the ribs as per the given thickness.

• Now select the component and assign the perimeter and macro length using Perimeter>length in mesh deck.

• Now prepare the part for meshing by made some cuts and suppress some double cons to get good mesh flow and minimum length fail.

• After do the topo. Now assign mesh parameters and quality criteria for meshing as given above.

• Now we start meshing using Mesh generation>best or spot for Your preference. we should start in one region and spread it out, Start the region has more single cons.

• After generate mesh use reconstruct tool in Shell mesh>reconstruct for get good mesh flow while remesh the macros.

• Now We can use split,swap,paste tool for reduce the opposite trias and back to back trias.
• Split-The tool used to split the elements by edes and by nodes to move forwar the trias.

• Swap-The tool used to swap the tria to neighbour element.
• Paste-The tool used to move the tria backwards by pasting the nodes.

• We can use Smooth tool to get smooth mesh flow over meshed up areas using Shell mesh>smooth.

• After we finish the meshing for the entire component. We should select draw shell as solids in quality criteria>presentation parameters for see the component as thickened surfaces.

Final Images:

83 OFF elements can't be avoidable due to certain features especially in ribs area.

With thickened images:

Learning outcomes:

• Learnt to know how to take midsurface for dog houses.
• Learnt to use the extend and intersect tool extensively.
• Learnt to get good mesh flow over critical area like dog houses, ribs etc.,

Conclusion:

• The given instrument panel was meshed using extracted mid surface and given quality criteria as per requirements. some elements are off due to unavoidable reasons.