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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。
The space-stationary stochastic vibration of the vehicle-bridge coupled system with orbital irregularities is studied. The vehicle adopts a quadric passenger suspension model with two degrees of suspension and 15 degrees of freedom. The bridge adopts the spatial beam element model, and the orbit irregularity is assumed to be a multi-point and out-of-phase stable random excitation. The virtual excitation method is used to transform the orbit irregularity into a series of simple harmonic load forms. Solving the vibration equation of the vehicle - bridge coupling system by using separation iteration method. The stochastic vibration analysis of three spanned 33.3 m simply supported beams is carried out by using the virtual excitation method and the Monte Carlo method, respectively, which verifies the correctness of the proposed method.