Week 6-Meshing of Hood Challenge
Week 6 Challenge: Meshing of HOOD Challenge
Course: HyperMesh for FEA Plastics and Sheet Metal Applications
March 16, 2021
Submitted by: Amanpreet Singh Whan
Supervisor: David Nirmal Paul
List of Figures
Figure 1-Imported given Hood CAD Model.
Figure 2-Outer Extract Mid Surface.
Figure 3-Inner Extract Mid Surface.
Figure 4-Latch reinforcement Extracted Mid Surface.
Figure 5- Hinge Reinforcement Extracted Mid surfaces.
Figure 6-Quality criteria set as per challenge requirements.
Figure 7- Meshed Inner Extract Mid Surface.
Figure 8- Meshed Outer Extract Mid Surface.
Figure 9- Meshed Hinge reinforcement extracted Mid Surface.
Figure 10- Meshed Latch reinforcement extracted Mid Surface.
Figure 11- Meshed given Hood CAD Model.
Figure 12- 2D meshed Detailed representation of Hood CAD model.
Table of Contents
3.1 Geometry Clean-up of Hood CAD Model
3.2 Extracting Mid Surface of Hood Components.
3.3 Shell Meshing of Extracted Mid Surfaces of the Hood Components.
1 Introduction
HyperMesh is the market-leading, multi-disciplinary finite element pre-processor which manages the generation of the largest, most complex models, starting with the import of CAD geometry to exporting a ready-to-run solver file. HyperMesh supports a wide variety of CAD and solver interfaces, making it a perfect solution for most industry verticals and domains. With its advanced geometry and meshing capabilities, HyperMesh provides an environment for rapid model generation. Generating high-quality mesh quickly is just one of Hyper Mesh’s core competencies. For complex sub-system generation and assembly, HyperMesh has advanced model assembly tools. Modeling of laminate composites is supported by advanced creation, editing, and visualization tools. Design changes can be made easily via mesh morphing and geometry dimensioning.
The hood or so-called bonnet is a crucial component of the front portion of an automobile. More than just merely acting as a hinged cover for the engine, the hood offers protection to the engine and other parts of the vehicle from dust, other foreign particles, and most importantly absorbs the noise and vibrations generated by the engine due to excitation on rough roads and at higher speeds. Nowadays, the hoods are essentially designed to be aerodynamic to reduce the impacts of air resistance and add a luxurious look to automobiles.
A hood normally consists of four parts namely:
- Outer Panel
- Inner Extract
- Latch Reinforcement
- Hinge Reinforcement
2 Aims
- Check and fix all the geometry errors of the given Model for Geometry Clean-up purposes.
- Extract/ Generate Middle Surface for all the components of the given model.
- Perform 2D or Shell Meshing of the components of the model as per given Mesh Quality Criterion to generate an overall good mesh flow for the entire model.
- Investigate and Improve the mesh quality wherever required.
3 Methodology and Results
The section describes the different stages that were performed using an engineering tool HyperWorks 2020 for the completion of the Week 6 Challenge task. These stages can be further broadly sub-categorized into three key steps, starting from importing of cad model to geometry clean-up for mid surface generation and finally carry out meshing of the extracted mid surface as per quality requirements.
3.1 Geometry Clean-up of Hood CAD Model
After opening the HyperWorks software, the first and foremost step is to import the given Hood CAD model and then patch up any of the free edges present highlighted in red lines or cons for the geometric clean-up purposes.
3.2 Extracting Mid Surface of Hood Components
The mid surface of a CAD design can be generated both manually and automatically. To generate mid surface automatically, click on the Mid surface tool under Geometry Module buttons and use the auto midsurface-> Skin offset command to extract mid surface for the components given Hood CAD model.
The results of the mid surfaces obtained using the skin offset command for the different components of the given CAD model are presented in the following pictures.
3.3 Shell Meshing of Extracted Mid Surfaces of the Hood Components
Before proceeding with meshing, it is important to create a washer split across circular regions and can be deployed using the washer split command from quick edit options under Geometry Module buttons. The automesh command was used to mesh the extracted mid surfaces of the different components of the Hood CAD model. The adopted meshing technique and obtained results are presented in the following pictures.
4 Conclusion
In conclusion, the main aims of the Week 6 Challenge were to perform geometry clean-up, extract the middle surface for the different components Hood CAD model, and finally perform shell meshing as per given quality requirements.
5 Appendix
