【摘要】 根据浮置板轨道的结构特点,建立了能反映浮置板轨道动态特性的力学模型,并提出了该模型的动柔度求解方法,通过数值计算分析了浮置板轨道的隔振性能及其影响因素。计算结果表明,浮置板轨道的隔振性能在中频段受浮置板自身弯曲振动固有特性影响较大;在同一块浮置板跨度内不同位置处其隔振性能有些差别,但在大多数位置隔振性能变化不大。改变单块浮置板长度对轨道系统的隔振性能影响不是很大,不同长度的浮置板传递给基础的力沿轨道方向的衰减过程是相似的。更多还原

【Abstract】 According to the structural characteristics of the floating slab track(FST),a new model,which effectively reflects the dynamic behaviour of the FST,is proposed in this study and a dynamic receptance method is developed to solve the FST model.The vibration isolation performance of the FST and the factors affecting the performance are analyzed by numerical simulations.It is found that the FST presents a good capability to isolate the track vibration in the frequency range above the system’s natural frequency.In the middle frequency range over the natural frequency,the performance of the FST is affected by the dynamic behaviour of the single floating slab.For the slabs with different lengths,the attenuations along the tracks of the forces transmitted from the FST to the infrastructures are similar.However,the force transmitted to the infrastructure from one slab to the neighbouring slab decays very quickly in the high frequency range.In addition,the performance of vibration isolation becomes slightly poorer when the excitation acts above the slab boundary,but at most other positions it is similar.更多还原