车辆各轮相干桥面不平顺激励的车桥耦合振动

根据车辆左右轮的互功率谱密度和相干函数,推导了左右轮桥面不平顺特性中对应相位角的相干关系,提出了采用相位角相干生成车辆各轮相干桥面不平顺激励的方法,并通过数值算例验证了该生成方法的可靠性.工程应用结果表明,车辆各轮相干桥面不平顺激励增大了桥梁、车辆竖向和车辆俯仰角的振动响应,但降低了车辆侧倾角的振动响应;不同相干函数模型对桥梁振动响应影响较小,但对车辆振动响应影响较大;同一相干函数模型,桥梁振动响应随着相干强度的增大而增大,但车辆振动响应随着相干强度的增大而减小;研究桥面不平顺随机激励对车桥耦合系统振动响应的影响有必要考虑车辆各轮的相干关系.

Vehicle-bridge coupling vibration excited by vehicle wheels with coherent deck irregularity

According to the cross power spectral density and coherence function of the left and right wheels of a vehicle,the coherence relationship of the corresponding phase angle in the characteristics of the left and right wheel deck irregularity was derived.This paper presented a method of coherent generation of all wheels correlation bridge deck irregularity excitation by phase angle coherence for all wheels,and the reliability of the method was verified by numerical examples.The results in engineering applications show that the vibration responses of the bridge,the vehicles vertical and vehicle pitch angle responses are increased,but the vibration response of the vehicle''s roll angle is reduced;Different coherence function models have little influence on the vibration response of the bridge,but have a great influence on the vehicle vibration response;For the same coherence function model,the vibration response of the bridge increases with the increase of the coherence strength,but the vehicle vibration response decreases with the increase of the coherence strength;In order to study the influence of random excitation on the vibration response of the vehicle-bridge coupled system,it is necessary to consider the coherent relationship of vehicle wheels.