Crash-box is a significant part of automotive passive safety system and serves as a main energy absorption device in frontal impact scenario. In this paper, a novel crash-box integrating an outer thin-walled tube and an inner auxetic cellular core has been designed and comprehensively investigated under axial load. The impact simulation of the auxetic crash-box has been carried out, and the results show that introduction of the auxetic core can improve its energy absorption capacity without increasing too much peak impact force. Based on the sensitivity analysis, the effects of its geometric parameters on the crashworthiness performance have been studied. Finally, collaborative optimization of the auxetic crash-box has been performed to simultaneously improve its crashworthiness under the low-speed (15 km/h) and high-speed (40 km/h) impact cases. In the optimization procedure, the least square support vector regression (LS-SVR) method and an improved particle swarm optimization (IPSO) algorithm with time-varying coefficients have been utilized. The results demonstrate that the optimized crash-box can comprehensively improve the energy absorption and impact force characteristics effectively. The auxetic crash-box and the collaborative optimization approach provide extensive references for the application of auxetic structure in vehicle crashworthiness design.

碰撞箱是汽车被动安全系统的重要组成部分，在正面碰撞的情况下用作主要的能量吸收装置。在本文中，设计了一种新颖的碰撞盒，该碰撞盒结合了外部薄壁管和内部膨胀蜂窝芯，并在轴向载荷下进行了全面研究。对撞车碰撞盒进行了碰撞仿真，结果表明，引入撞车芯可以提高其能量吸收能力，而不会增加太大的峰值冲击力。在敏感性分析的基础上，研究了其几何参数对耐撞性能的影响。最后，对撞车箱进行了协作优化，以同时提高其在低速（15 km / h）和高速（40 km / h）撞击情况下的耐撞性。在优化过程中，使用了最小二乘支持向量回归（LS-SVR）方法和具有时变系数的改进粒子群优化（IPSO）算法。结果表明，优化后的碰撞箱可以有效地综合改善能量吸收和冲击力特性。碰撞碰撞盒和协同优化方法为碰撞碰撞结构在车辆防撞设计中的应用提供了广泛的参考。结果表明，优化后的碰撞箱可以有效地综合改善能量吸收和冲击力特性。碰撞碰撞盒和协同优化方法为碰撞碰撞结构在车辆防撞设计中的应用提供了广泛的参考。结果表明，优化后的碰撞箱可以有效地综合改善能量吸收和冲击力特性。碰撞碰撞盒和协同优化方法为碰撞碰撞结构在车辆防撞设计中的应用提供了广泛的参考。