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本文依据振动理论,考察了在计及路面不平顺情形下,车辆以匀加速通过桥梁过程中的车辆-桥梁耦合系统的随机振动响应问题,其中车与桥梁分别采用1/4车模型与简支梁模型。考虑到车在加速通过桥的过程中,其位置是不断变化的,因而可将此车桥耦合系统的随机响应,归结为一个线性时变系统在演变随机激励下的响应问题。应用演变随机响应问题的时域方法,本文考察了车辆在匀加速通过桥梁过程中,车桥耦合系统的均方响应,并对所得的数值做了一些讨论。
In this paper, based on the vibration theory, the random vibration response of the vehicle-bridge coupling system under uniform acceleration of the vehicle considering the unevenness of the pavement is investigated. The vehicle and bridge are respectively simulated by 1/4 car model and simple support Beam model. Considering that the position of the car is changing constantly during its acceleration through the bridge, the random response of the system can be attributed to the response of a linear time-varying system under the evolution of random excitation. In this paper, the mean-square response of the vehicle-bridge coupling system during uniform acceleration passing through a bridge is investigated by applying the time-domain method evolving the random response problem. The numerical results obtained are discussed.