车桥时变耦合系统的随机响应分析  

Stochastic Dynamic Responses Analysis of Train-bridge Time-varying System

作　　者：朱艳[1] 李小珍[1] 

机构地区：[1]西南交通大学土木学院,成都610031

出　　处：《武汉理工大学学报》2010年第9期352-355,共4页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(50678150);四川省杰出青年基金(2010JQ0018)

摘　　要：研究了车桥耦合系统在轨道不平顺激励下的空间平稳随机振动。车辆采用二系悬挂15个自由度的四轴客车空间模型,桥梁采用空间梁单元模型,轨道不平顺假设为多点异相位平稳随机激励。采用虚拟激励法将轨道不平顺转化为一系列的简谐荷载形式。运用分离迭代法求解车桥耦合系统振动方程。分别采用虚拟激励法和Monte Carlo法对3跨33.3 m简支梁进行随机振动分析,验证了文中方法的正确性。A new method for a spatial stationary random vibration analysis of vehicle-bridge system subjected to track irregularity excitations is proposed.The vehicle is modeled as a four-wheel mass-spring-damper system with two layers of suspension systems possessing 15 degrees of freedom.The bridge is modeled as a space beam,and the track irregularity is assumed to be a uniformly modulated evolutionary random process with the phase-lags between the wheels taken into account.Pseudo-Excitation Method（PEM） is applied to transform the random surface roughness of the track into the superposition of a series of deterministic pseudo harmonic surface unevenness.Discrete iteration is applied in the solution of equation.Numerical examples are given.Comparisons with the Monte Carlo simulations show the effectiveness and satisfactory accuracy of the proposed method.

关 键 词：车辆-桥梁时变耦合系统 轨道不平顺 随机振动 虚拟激励法 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]