高速列车串行铝蜂窝吸能结构的轴向冲击动力学响应

Dynamic characteristics of serial honeycomb structure under high-speed impact

研究高速列车串行铝蜂窝吸能结构在高速轴向冲击下的动力学性能。首先通过准静态试验对单块铝蜂窝的力学性能进行测试;然后通过高速冲击试验研究串行铝蜂窝的动力学特性;最后,采用参数辨识模型,得到串行铝蜂窝在高速轴向冲击下的刚度变化,并根据试验结果对串行铝蜂窝在高速轴向冲击下的偏移失稳现象进行分析。研究结果表明:串行铝蜂窝刚度系数的变化与铝蜂窝系统中隔板速度变化有密切关系,铝蜂窝开始变形时其刚度系数迅速变小,当各蜂窝前端隔板速度开始下降时蜂窝刚度系数曲线趋向平缓;串行铝蜂窝具有吸能量大、可实现变形模式可控,能够满足高速列车的冲击吸能量要求。

Dynamic behavior of serial honeycomb under axial high-speed impact was studied. Mechanical behavior of single honeycomb block was tested in quasi-static experiments. And dynamic performance of serial honeycomb under axial high-speed impact was tested and studied. Rigidity change and destabilization of each honeycomb block were obtained and analyzed using parametric identification method. The results show that the rigidity change of serial honeycomb under axial high-speed impact is closely related to its deformation mode. The stiffness coefficient tends to decrease greatly when the honeycombs＇ deformation starts, and then becomes smooth as velocity of forward isolation plates begins to drop. The serial-aluminum-honeycomb is of high energy absorption and controllable deformation pattern, which can satisfy the impact energy absorption requirements of high-speed train.