Project 2 - 2D meshing on the instrumental Panel

Objective:

To check the geometry and obtain the mid surface then mesh the given instrumental panel with the given quality criteria and assign thickness for the model.

Given quality criteria:

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
10	Tria Percentage	15

Procedure:

Imported model

Figure. 1 shows the imported instrumental panel model in ANSA

Figure. 1. Imported  instrumental Panel model

Geometry Clean-up

The next essential stage is checking the model's geometry. This will assist us in eliminating all surface errors, undesirable Cons, as well as any disruptions made to the model. this is done by

Command: Tools+Checks + Geometry. 

For the Checks Manager dialog box as shown in Figure. 2. Total Errors can be cleared automatically by 

Command: Right-click + Fix.

In the Checks Manager dialog box. Errors can be cleared manually by 

Command: Faces+Delete / New, Command: Faces+ Topo, Command: Faces+ Orient.

Figure 2: Model after Command: Faces+ Topo

Figure 3: Model after Command: Faces+ Orient

Figure 4: Model while new faces, Command: Faces+ New

Figure. 5. Checks manager dialog box

Figure. 6. shows the Cleaned Geometry of the model using the Checks Manager dialog box.

Figure. 6. Checks manager dialog box with zero errors.

Midsurface

To extract the midsurface by the following commands.

For two surfaces with equal thickness. 

Command: Faces+Offset

Figure 5. shows the top body upper body

For varying thickness

Command: Faces + Middle + (single or multi).

For irregular quadrilateral (Such as threads and trapezoid)

Command: Curve+middle (To get mid curve of the threads).

Command: Cons+Project (To project the midcurve to midsurface).

Command: Faces+New (To create new surface).

Figure 7. shows the  instrumental Panel  Mid- surface

Figure 7.  Instrumental Panel  Mid- surface

Assigning Thickness 

The midsurface thickness to be assigned. Since we have some surfaces with different thicknesses, we must gradually alter the thickness under each surface by the

Command: Property+New+Pshell+Assign thickness+Assign name.

Figure 8. shows the properties dialogue box

Figure 8. Properties dialogue box

Quality Criteria

Assign quality criteria for the mesh by clicking quality criteria  tab then assign values in ths shells by checking the given parameters as per given data. Figure. 9. shows the Quality criteria dialoge box 

Figure. 9. The Quality criteria dialog box 

Meshing

Before mesh generation assign peremeter lenght by

Command: Mesh +Perimeter + Length 

Figure 10. shows the length parameters dialogbox

For Meshing select best mesh in the mesh generation using the 

Command: Mesh generation+Best

The mesh will be generated and it should be reconstructed  with

Command: Shell mesh+Reconstruct

To get quality mesh and to reduce tria elements by the following commands.

For element spliting

Command: Element + Split.

For element sjoining

Command: Element + Join.

For element refining

Command: Shell Mesh+Refine

Figure 11. shows the meshed model with nill off

Figure 10. Length parameters dialog box

Figure 11. Meshed Model

After completion of meshing, use Quality Criteria dialoge box in the Presentation Parameters check the Draw Shell as Solid as shown in Figure. 12.

Using this option allows us to view all elements as solid or in three dimensions.

Figure. 12. Checking the Draw Shell as Solid

2D mesh will be displayed as solid mesh according to given thickness of each midsurface as in Figure. 13.

Figure. 13. Solid Meshed Elements

Conclusion

Various surface thicknesses are allocated and a midsurface is utilized to mesh the provided instrumental Panel model with the quality criteria.