A Kind of FEM Dummy Material Parameter Curve Optimization Method Based on Vehicle Collision Simulation

Abstract

optimization method Abstract:Based on full-size vehicle collision test, a new finite element dummy model (FEM dummy) was built in this paper, at the same time the corresponding dummy's material parameter curve optimization method was proposed. For the result of dummy simulation being in keep with that of full scale vehicle collision experiments, it was necessary to scientifically adjust the dummy's structural material parameters and parameters curve. Besides, optimized design of parameters curve was a more complex work. Therefore proposing a method of the curve approximate optimization to meet the design requirements was necessary. First, according to the variation of the curve, we cut it into segments, and redefined them as parameters. Then, using the parameter optimization method, the important parameters was selected which significantly affected the results of the simulation. Finally, using that method obtained the curve which made it consistent with the full-scale vehicle collision test results. In the paper, positive collision chest pressure test of a new FEM dummy as an example, to make sure simulation dummy' chest pressure peak and spring rate and so on were consistent with full-size vehicle collision dummy data, Use this method to optimization design someone material parameter curve. The result proved that the method could be used to improve the new FEM dummy to meet the needs of the full-scale vehicle collision test. development, FEM Dummy as the evaluation index is particularly important. From the 80's, the FEM Dummy model has been established by industry and academia. Today, The III 50th Hybrid finite element model established by American LSTC Company and TNO uses a non-real solid finite element model to speed up the calculation. these two models have their own shortcomings. LSTC company in order to improve the performance of the model and the accuracy of the response has been increasing the calculation time. TNO's model is fast but not real solid finite element models. Besides, they both simulate the physical characteristics of people in western countries. The FEM dummy's research started late in our country. based on the human body mechanics and finite element method analysis the 95% FEM dummy model of Chinese body was established by Chen Shuang, Yuan Zhongfan et al. It has basically realized the simulation of mechanical structure and similarity of mechanical properties of the crash dummy. Cai Zhihua, Lan Fengchong et al established the finite element model of the humans' thorax based on automobile collision damage. The biomechanical response and damage mechanism of the chest in a crash environment are predicted and evaluated by it. But the model used in the test data is also a western data, and cannot fully reflect the Chinese people's biomechanical response. Based on a new domestic FEM dummy model, this paper aims to solve the low calculation accuracy. For the result of dummy simulation being in keep with that of full scale vehicle collision