Analysis for the vibration reduction characteristics of steel spring floating slab tracks under different types of excitation
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摘要: 为了研究不同激励作用下钢弹簧浮置板轨道的减振效果，该文建立了二维车辆-轨道耦合动力有限元模型，考虑了普通整体道床和钢弹簧浮置板轨道两种轨道型式，对比和分析了在冲击荷载、移动常力和移动列车荷载作用下，两种轨道结构的振动响应，并通过插入损失评价不同荷载作用下钢弹簧浮置板轨道的减振效果。结果表明：①与移动常力作用相比，冲击荷载会高估钢弹簧浮置板轨道的减振效果。②与移动单节车辆作用相比，冲击荷载在钢弹簧浮置板轨道自振频率以下频段会低估其减振效果，在125 Hz~400 Hz频段内会高估减振效果。Abstract: To investigate the vibration reduction characteristics of steel spring floating slab tracks (FSTs) under different types of excitation, a two-dimensional train-track coupling dynamic finite element model was established, and two kinds of track types of monolithic track and spring steel floating slab track were considered. The impact load, the moving constant load and the train load were used to study the vibration responses of the track structure in terms of insert loss. The results indicated that:1) Compared with the moving constant load, the impact load overestimated the vibration reduction characteristics of FSTs; 2) Compared with the moving single vehicle, the vibration reduction characteristics of FSTs was underestimated below FST natural frequency under the impact load and was overestimated between 125 Hz and 400 Hz.
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