Discrete Material and Thickness Optimization of Seat Cushion Frame under Dynamic Condition
Automotive seats are one of the representative automotive parts that require weight reduction while satisfying safety requirements. Some methods consider both strength and weight to reduce the weight of seats, but it is difficult to apply them to all parts considering both the number of parts and their costs. For the weight reduction of the seat frame, methods for analyzing the impact on strength and weight and applying different materials and thicknesses to each part depending on the impact level can be considered.
In this study, a method of determining commercially available materials and thicknesses by applying the discrete material and thickness optimization method under a dynamic load condition that considers the FMVSS 214 regulation was proposed for the standard automotive seat frame provided by NHTSA.
Through the first optimization, seven parts having a significant impact on the results were selected. Through the second optimization performed using the selected main parts as parameters, materials were finally determined and a weight reduction of 18% was achieved. The validity of the proposed method was verified by comparing the weight of the model before and after optimization. Hypermesh was used for finite element modeling, and LS-Dyna was used for basic analysis and optimization.