A small test device of inter-collision sled was developed with a foundation of length 25 m and width 2.2 m and without any fixed barrier. The test device used elastic ropes as driving force with drawing collision energy absorption tubes to transform collision force from traditional external force between sled and fixed barrier to internal force between test sled and counter-weight sled by head-on collision. A finite element method (FEM) established and some quasi-static tensile tests were used to investigate the friction coefficient between the energy absorption tubes and the compression block and the energy absorption characteristics of the tubes. The objective function extracted from two comparison displacement-force curves was determined by using a least square method. The simulation results show that the displacement-force curve and deformation mode of the simulation are in good agreement with these of the experiment when the friction coefficient is 0.177. Therefore,changing the structure parameters of energy absorption can reproduce the variable acceleration waveforms in the Chinese National Standards, including GB15083-2006 and so on.%开发了一种对撞型台车小型试验装置.该装置无需固定壁障,地基长25 m,宽2.2 m.通过弹性绳驱动,将传统试验台车撞击固定壁障的外力平衡,转化为试验台车和配重台车对撞的内力平衡.采用拉伸吸能筒达到吸能目的,建立了一种吸能装置有限元模型(FEM),并进行了准静态拉伸试验.通过对标位移与力曲线,并采用最小二乘法确定目标函数,研究吸能筒与压缩块之间的摩擦因数及吸能特性.仿真结果表明:当摩擦因数为0.177时,试验与仿真所得的位移与力曲线及变形模式基本吻合.因此,通过改变弹性绳的规格及装置前部吸能结构的参数,可以复现国家标准GB15083-2006等不同的加速度波形曲线.
展开▼
