Hood Meshing Using ANSA

Objectives:

• The objective of this project is to performing meshing for Hood using the ANSA tool.
• From the given Component, Checking geometrical errors and mesh with given element quality criteria
• Extracting the mid surface from the component.
• After meshing the component the thickness has to be assigned.

Given Quality Criteria Feature:

S.No	Quality Criteria	Value
1	Target/Average length	5
2	Minimum Length	3
3	Maximum Length	7
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

Model:

• Importing the Hood stp.file to the Ansa toolbar.

Geometry Checks:

• The geometry checks are used to check the geometry setup file using checkbox by selecting the geometry option
• And it shows that various errors in the geometry on the surface.
• After that we need to surfacing cleaning is done

Surface Cleaning:

1. Surface Cleaning is the process of clean up the surface error.
2. An error such as holes, Extra surface, single cones.
3. Single cones are used to clean up using the Select the all with Topology method.
4. Some of the tools used to fix the problem are coons -surface patch, Fill holes, New for the Faces.
5. After selecting the particular area on that surface are missing like that using the tools to patch the area with select after that clicking the middle mouse bottom.
6. Some of the Extrusion across the surface of the model is deleted according to the deleted.
7. In the surface cleaning methods, Ansa tools itself giving the Autofix for the some of the Error takes place in the model.
8. Further open edges and single cons are in the geometry are corrected using the topo options.

Midsurface:

1. Midsurface is the process of Extracting the skin of the component according to the thickness of the Component.
2. In the topo mode, extracting the mid surface by Faces option in that Offset we need to select.
3. After selecting the offset we need to select the surface its shows the direction of the arrow.
4. If upwards indicates means we need to give value in negative it's vice versa
5. A red color line indicates the mid surface take in the component.
6. After Extracting the mid surface we need to assign the PID region with thickness.
7. Each and every part of the component is taking the mid surface as per the thickness.
8. For the Outer panel and inner panel having a thickness of 0.75mm, so we need to give the offset value is (0.75/2).
9. For the latch and Lock area surface having a thickness of 1.2mm, so we need to give the offset value is(1.2/2).
10. In the Topo mode itself, we will be clearing all the Geometry cleanup.

Offset:

Midsurface of Outer Panel:

Midsurface of Inner panel:

Midsurface for Latches:

Midsurface for Lock area:

Property Id:

Property id is the process in which after the mid surface has taken we need to assign the Property to the surface with thickness.

Meshing:

1. FE meshes are better representations of their geometric parents. Also, it is easy to maintain and update any changes in the geometry by simply reworking the updated area instead of recreating the FE from scratch.
2. Switching to the Mesh mode and we need to give the shell element size length according to the given input =5mm.
3. For getting the smooth mesh we need to segregate the surface to various cut regions.
4. Before Meshing we need to clean up the Some Geometry error also then only the flow of mesh should be smooth.
5. While Meshing we need to maintain the quality criteria then only we will get the required output.
6. We need to set up the mesh Parameters as will as presentation parameters according to given inputs.
7. In the Mesh parameters, we are giving the target length with minimum and maximum length.
8. In the presentation parameters, we need to enable Elements (%) and details on the Demand effect should be all details.
9. In the Mesh Generation, we need to give the Free or Best mesh as per the Mesh flow.

Mesh Parameters:

Quality Criteria:

Presentation Parameters:

Meshing Outer Panel:

Meshing Inner Panel:

Meshing Latch area:

Meshing Lock Area:

Final FE Model:

Google drive link for Hood:

https://drive.google.com/open?id=1NFT7hW13g6DTinBzOPPnmQu_RxMxvqZJ

Conclusion:

The giving Hood setup is pre-processed successfully, with assembled all parts with FE Mesh that satisfy all quality criteria and thickness to be assigned with the property of the component.