However, it is well know that the random vibration analysis of vehicle-bridge coupling system is a very difficult problem.
而对车辆-桥梁这种复杂的耦合系统进行随机分析，历来被认为是一件非常困难的工作。
Finally, we do some research on more than one vehicle-bridge coupling system model and vibration analysis of the problem.
最后研究了多台变速车辆与桥梁耦合系统的振动问题。
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