在某次整车正面偏置碰撞试验中发现，根据中国新车评价规程(C-NCAP)的评分规则，膝盖滑动位移超标，得分较低。为改进相关部件的结构，根据实际的试验状态，建立约束系统模型，用多刚体与有限元分析相结合的方法，仿真分析仪表板造型、结构强度以及约束系统；确定了一种仪表板面板和杂物箱面板的结构优化方案；并进行了试验验证。结果表明：和原方案比较，该方案的膝盖滑动位移由12.7 mm降低到6.5 mm，膝部得分提高2.76分。因此，该研究方法可用于结构优化，缩短产品开发时间。%In an offset deformable barrier crash, it was found that the knee slider displacement was beyond target and the score was lower than the expected one according to the assessment method by the China New Car Assessment Program (C-NCAP). To solve the problem, some relevant structures were improved by the authors. A multi-body model combined with the ifnite element method was built based on the vehicle test data to simulate the cases of the instrument panel (IP) shape, the structure strength, and the supplemental restraint system (SRS) to ascertain the improving direction. The optimized design of the dashboard and gloves box body was veriifed by tests. The results show that the knee slider displacement reduces from 12.7mm to 6.5mm with the femur score increasing 2.76 points. Therefore, the method can be used to optimize vehicle structures and shorten the product development period.
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