OSU-Honda automobile hood dataset (CarHoods10k)

The CarHoods10k data set comprises a set of over 10,000 3D mesh geometries for variants of car hood frames, generated through an automated, industry-grade Computer Aided Design (CAD) workflow described in Ramnath (2019). The data set provides realistic designs that were validated by experts with respect to realism, manufacturability, variability, and performance. Variations in geometries were generated by a feature-based approach that varies parameter values describing design features on 109 parameterized base geometries ('skins'). Parameters describe feature patterns such as cut-outs or ribs on the hood frame as well as their properties, for example, rib location and height, or cut-out location. Geometries are represented as surface meshes (STL files) and are provided with the corresponding design parameter values and performance metrics from structural mechanics, generated through finite element analysis (FEA). The data set provides realistic and validated designs for the evaluation and development of methods such as optimization approaches or machine learning for metamodeling or performance prediction. CarHoods10k thus enables the evaluate of data-driven approaches for application in the automotive engineering design domain and others.

Methods
Generation of hood geometries

Geometry data were generated using a feature-based modeling approach. In the context of automotive car hoods, features describe components that contribute to desirable properties of the design, e.g., ribs to add stiffness during driving or impact, or cut-outs and pockets to reduce overall weight. Real car hood designs were simplified by removing features that were irrelevant for the hood's performance. Remaining features were created independent of the base surface to allow for the generation of a sufficiently large variety of hoods by combining features and feature patterns with a set of 100 base geometries ('skins'). Features were parametrized and generated using an automated workflow in CATIA v5 (see referenced publications for details). Note that some parametrizations led to invalid geometries (e.g., intersecting features) such that in total 10,478 unique hood geometry files were generated. CAD models were converted to watertight STL surface meshes in the STL format.

Generation of Simulation Results

For each car hood, structural mechanics performance values were simulated using finite element analysis (FEA). FEA was performed for a hood lift load case under driving conditions, which is an important structural requirement when designing car hood frames. The obtained performance values are maximum equivalent stress [MPa] and maximum directional deformation [mm]. Additionally the geometry mass [kg] is provided for each design. FEA was performed using a standardized setup over all geometries (including mesh, boundary conditions, loads, etc.) to allow for automated generation of simulation results. Again, not all FEA were successful such that for 10,070 of the 10,478 geometries, performance results are available.