浮置板轨道隔振性能研究

为了分析浮置板轨道的动态特性,根据结构动力学原理建立了两种浮置板轨道的计算模型.应用所建模型对长、短两类浮置板轨道的隔振性能进行了分析和比较.计算结果表明,浮置板轨道对于隔离钢轨传递给基础的振动有显著作用,长浮置板轨道的隔振性能在力的作用处稍优于短浮置板轨道,但沿钢轨方向短浮置板轨道的振动衰减比较快.浮置板系统的固有频率越低,隔振性能越好.可以通过增加浮置板质量和降低浮置板支承刚度的方法降低浮置板轨道系统的固有频率,以达到较好的隔振性能.

On Vibration Isolation Performance of Floating Slab Track

In order to analyze the dynamic behavior of floating slab track(FST),two kinds of model were developed for the FST system on the base of structure dynamics.The vibration isolation performance of the track with short and long floating slab was calculated and compared using the developed models.It is found that the FST can effectively isolate the vibration transmitted from the rail to the infrastructure.The track with long floating slab shows better performance than that with short floating slab in terms of vibration(isolation) at the forcing position,whereas the vibration decays more quickly in the track with short floating slab.The lower the natural frequency of the FST is,the better the performance of vibration isolation is.Both increasing the mass and reducing the support stiffness of the slab can reduce the natural frequency of the FST system to achieve better performance of vibration isolation.