In view of the problem of insufficient stiffness of the front underrun protective device ( FUPD) in a commercial vehicle, the plate-type bracket structure of original FUPD is redesigned by applying both topology and parameter optimization techniques with a crash buffering box beam added on. A simulation analysis is performed on the redesigned FUPD with LS-DYNA. The results show that the new FUPD not only solves the problem of inadequate stiffness, I. E. Gains the function of front underrun resistance, but can also play the role of buffering and energy absorption.%针对某商用车前下部防护装置刚度不足的问题,应用拓扑优化与参数优化方法,对原车前下部防护板式支架结构进行重新设计,并在支架前端加装碰撞缓冲盒形梁.应用LS-DYNA软件对新设计的防护装置进行了仿真分析.结果表明,新的前下部防护装置不仅解决了原车防护装置刚度不足的问题,即具有碰撞阻挡功能,且能起到缓冲吸能的作用.
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