Structural Optimization Design of BIW in Concept Stage

In concept development stage of traditional body development process, simulation and optimization could not be done with no geometric data. In this paper, a parameterized model was built based on the reference car parameterized model, new car style and section data. The parameterized model was used to analyze the influence of modeling on the performance of vehicle body. Multi-disciplinary and multi-object optimization was carried out based on stiffness, collision and mode. An approximate model was constructed by response surface method. Section size was optimized to improve the structure performance and thickness of the body parts was optimized to reduce weight. At the concept stage, the performance reached the standard and the weight was reduced by 16.7 kg.