Week 6-Meshing of Hood Challenge

Meshing of an Automobile Hood using Hypermesh

Aim:-

1) To Check the geometry for the given model.

2) To Extract all the Mid-surfaces of the Component.

3) To mesh all the Components in the model using the Following Criteria and finally giving thickness to the Component.

Theory:-

The model used in this Challenge is a Car Hood model The hood is the hinged cover over the engine of motor vehicles that allows access to the engine Compartment ( or ) trunk for maintenance and repair.

A Hood Consists of the Four Parts namely :-

1) Outer Extract (or) the Outer Cover.

2) Inner Extract  (or) the Inner Cover with perforations for locking the Inside Parts.

3) Latch Reinforcements, Which is attached to the Inner Extract for locking the hood.

4) Hinge Reinforcements, Which is used to make a hood stand on its own at an angle while doing Repair ( or ) maintenance work.

                                                             Fig 1. Automobile Hood

Procedure :-

1. Importing the Model and geometry Cleanup:-

1) We Import the Hood model using the Import geometry option. The Full Hood model shown in the Image given below.

                                                                  Fig 2.  Given Model  

2) We then, see that the geometry is good and free of any errors ,so we proceed to take the mid-surface part by part.

2. Mid-Surfacing :-

3) We Proceed to take the Mid-Surface for each Component. First we take mid-surface for the outer extract by using the mid surface option and we rearrange the construction lines using the split surface node option in quick edit toolbar as shown in the image given below.

                                                    Fig 3. Outer Extract Mid Surface

4) Similarily,we take the midsurface for other Components Inner extract, Latch and Hinges as shown in the Image given below.

                                                      Fig 4. Inner Extract Mid Surface

                                                 Fig 5.Latch Reinforcement extract mid surface.

                                               Fig 6. Hinge Reinforcent Extact Mid Surface

5) We, then alter the Construction lines before meshing using the toogle option in quick edit toolbar and then we proceed for meshing the Components one by one.

3. Meshing :-

6) We first take the Latch and Perform mesh over the Whole Component region by region to obtain a good mesh.We mesh the Component with 5mm as target element length as shown in the aim. The meshed latch is shown in the image given below.

                                                               Fig 7. Meshing of Latch Mid Surface

7) we use the quality Indes under the 2D module and we check for any quality issues. we find that there are quality Issues in some regions for that, we use QI tools like Element Optimize, Swap edge, Drag tria e.t.c. to get a Proper mesh flow 

8) After that, We use smooth option under the 2D module to smooth the mesh such we obtain a better mesh flow as shown in the Image given below.

9) We follow the Similar Process for the Hinges and Perform the mesh and Clean up the errors using the Quality Index and Finally, Perform Smooth option over the Whole Component We Finally get the good mesh over the Hinges Which is Free of Quality errors as shown in the image given below.

                                                         8. Meshing of Hinge Mid-Surfaces

10) The Inner Extract has several Parts and Its difficult to have fine mesh on the surface, to get it properly done it is divided into the smaller parts, The surfacs are divided into smaller rectangular surfaces to have proper mesh wherever possible but while Connecting with the different surfaces it getting free edges.the free edges are removed with equivalence and manually replacing the node. At the Circle adding the washer split of 5mm to Capture normal Quad elements While Connecting errors at the Curve surface, Probably meshing at such surface getting warpage which fixed by splitting the surface and meshing the trias at some distance Opposite trias are not removed which are at different surfaces to avoid alignment of elements and also it is acceptable at big parts. While fixing the errors on given quality criteria always maintain the elements align to the feature line. All errors are fixed and achieved the fine mesh with maintaining the trias management and proper quads. The image given below shows in the Component is free of Quality errors.

11) We use the reflect option to reflect the Symmetric surface and obtain the surface of any Quality errors as shown in the images given below.

                                                         9. Meshing Of Inner Extract Mid Surface

12) The similar Process is Carried out for Outer Extract, all the Quality Errors are Cleared.

13) We, then use the reflect option to reflect the symmetric surface as shown in the image given below.

                                                     10. Meshing of Outer Extract Mid Surface

14) We finally get a good mesh over all the Components as shown in the image given below.

                                                        Fig 11. Final Model (Showing no Quality errors )

                                                         Fig 12.Final Model ( Showing Normals )

15) We, then finally use the create option by right clicking on the model browser and Create Properties and material for the Mid Surface Components and also assign thickness to the Components as shown in the Images given below.

Conclusion :-

 1) The given hood model was checked for the geometry errors and Cleared.

 2) The mid-surface was generated for all the Components in the Hood.

 3)  The Properties and material were assigned to all the Components in the Model Browser.

 4)  The Components were meshed seperately using the Quality Criteria given in the aim, the quality issues were cleared               using  the Quality Index option and Symmetrical Surfaces with the mesh for inner and outer extracts were bought back

       using the reflect option.