基于相似原理的磁浮车桥耦合振动研究

Study on coupling vibration of maglev vehicle-bridge based on the similarity theory

为研究磁浮车辆-悬浮控制-桥梁系统垂向耦合振动,基于相似原理建立磁浮车辆-悬浮控制-弹性桥梁垂向耦合动力学模型。结合磁浮车辆及桥梁参数,确定系统各参数的相似比例系数,最终通过系统仿真比较分析原型桥梁与比例桥梁的振动频率及车辆运行时桥梁的动态响应。研究结果表明:基于相似原理的原型桥梁与比例桥梁对车辆运行激扰的动态响应基本一致,两者的一阶振动频率工程意义上基本保持一致。由于比例桥梁的抗弯刚度相对于原型桥梁较小,故其跨中加速度较大约为原型桥梁的5倍。比例桥梁振动加速度最大值出现在车辆进出桥梁阶段。

Aiming at the study of vertical coupling vibration of maglev vehicle-suspension control-bridge,the maglev vehicle-suspension control-bridge vertical coupling dynamic model was established based on the similarity theory. The similar proportion coefficients with respect of the parameters in simulation systems were determined through combining the existing maglev vehicle with bridge parameters. The comparative analysis of vibration frequency and dynamic response between the experimental bridge and the real bridge was accomplished by system simulation. The results show that,based on the similarity theory,the first resonance frequencies are practical same between the experimental bridge and the real bridge. The dynamic responses representing the vehicle runs are also consistent. Due to the weaker flexural rigidity of experimental bridge,the vibration acceleration at the midspan is about four times larger than that in the actual bridge. And the peek of the vibration acceleration occurs when vehicles ingress or egress the bridge.