电动汽车动力电池碰撞安全设计方法研究

文章结合国内外汽车法规及新车评价规程,研究了不同碰撞工况对某款电动汽车动力电池的损伤影响。研究发现,在侧面斜柱碰工况下,电池模组容易受到挤压,动力电池系统发生短路、漏液及起火的风险较大;同时,通过对某款电动汽车在斜柱碰工况下电安全防护设计的研究,提出一种基于电池模组损伤容限的动力电池防护设计方法,该方法有利于车辆的轻量化开发,可降低电动汽车能耗及整车物料成本。     

Ship appearance optimal design on RCS reduction using response surface method and genetic algorithms

Radar cross section (RCS) reduction technologies are very important in survivability of the militarynaval vessels. Ship appearance shaping as an effective countermeasure of RCS reduction redirects the scatteredenergy from one angular region of interest in space to another region of little interest. To decrease the scatteringelectromagnetic signals from ship scientifically, optimization methods should be introduced in shaping design.Based on the assumption of the characteristic section design method, mathematical formulations for optimalshaping design were established. Because of the computation-intensive analysis and singularity in shapingoptimization, the response surface method (RSM) combined genetic algorithm (GA) was proposed. The poly-nomial response surface method was adopted in model approximation. Then genetic algorithms were employedto solve the surrogate optimization problem. By comparison RCS of the conventional and the optimal design,the superiority and effectiveness of proposed design methodology were verified.Ky words: radar cross section (RCS); characteristic section design method; response surface method; genetic algorithm (GA) was proposed. The polynomial response surface method was adopted in model approximation. Then genetic algorithms were employed to solve the surrogate optimization problem. By comparison RCS of the conventional and the optimal design, the superiority and effectiveness of proposed design methodology were verified.     

基于SPH方法的燃油箱碰撞工况优化设计

为解决某车型正碰过程中燃油箱固定机构失效问题,建立了某车型燃油箱在64 km/h偏置碰撞工况中的模型。应用SPH方法有限元模型,分析油箱固定机构失效过程,发现油箱脱落主要是因为油箱绑带从安装孔中滑脱。针对此原因制定了相应的优化方案,在有限元模型中证明效果明显,可以有效解决油箱脱落问题,并进行了整车碰撞试验验证。     

考虑振级落差要求的齿轮箱基座优化设计

对某新型齿轮箱基座采用结构动力学优化方法进行设计改进,建立了考虑指定频率区间内振级落差性能要求,以基座重量为目标函数的齿轮箱基座尺寸与拓扑优化设计模型.通过两种优化方案,使新型基座低中频段振级落差由5dB提高到12dB,找到对振动传递影响较大的肋板和减振效果良好的结构拓扑形式.     

混合动力轿车后碰安全性研究

针对某自主品牌混合动力轿车开发项目,利用有限元仿真分析和整车碰撞试验验证相结合的方法,研究了其高速后碰过程中燃油系统的完整性及高压电安全防护。通过合理的后舱结构设计以及软硬件双重高压防护的方案,使该轿车顺利通过高压电车辆国家后碰安全性法规。     

整车侧面移动壁障碰撞的耦合仿真计算

如何准确预测和评价整车侧面碰撞结构侵入情况下的乘员伤害是目前的工程难题。文章针对E-NCAP侧面碰撞规程,采用Ls-dyna有限元与Madymo多刚体耦合计算方法建立整车有限元与ES一2FacetQ假人耦合模型,仿真分析车身侧面碰撞变形,评价结构侵入后的乘员伤害。耦合计算结果表明,车身侧面结构变形和假人伤害与碰撞试验值具有较好的吻合度,证明了耦合方法的可行性和正确性,可为改进车身侧面结构提供参考依据。