高架钢弹簧浮置板轨道减振特性分析

Vibration Reduction Characteristics of Steel Spring Floating Slab Track in Metro Viaduct

摘要:

分别采用有限元和现场试验方法从时频域角度对高架钢弹簧浮置板轨道结构的减振特性进行了分析.研究结果表明，减振器刚度和间距的改变对浮置板前10阶振动频率分布影响较大，减振器刚度和间距的变化是通过改变浮置板单位长度刚度来达到控制减振效果的目的，浮置板顶升后高架箱梁结构顶板、翼缘、腹板和底板的振动水平在25~100 Hz范围内分别减小11~22 dB，12~20 dB，20~30 dB和12~21 dB，减振效果随减振器刚度的增大而减小，随减振器间距的增大而增大，箱梁结构的位移受减振器刚度和间距变化的影响较小；浮置板轨道在63~2 000 Hz范围对轮轨噪声具有一定的降噪效果.

Abstract:

The vibration reduction characteristics of steel spring floating slab track in metro viaduct were analyzed by the finite element method and field test in time domain and frequency domain respectively. The results show that the stiffness and distance span of the damper have a large influence on the top 10 order natural frequency distribution of floating slab, the variation of stiffness and distance span of damper control the vibration reduction effects of floating slab by changing the stiffness per unit length, the vibration level of roof, flange, web and the bottom plate of elevated girder decreased with 11~22 dB, 12~20 dB, 20~30 dB and 12~21 dB respectively in the range of 25~100 Hz when slab is lifted, the vibration levels reduction increases as damper stiffness decreases and as the distance span increases，the stiffness and distance of steel spring almost have no effect on the displacement of elevated girder. The floating slab track has a certain reduction affection on wheel rail noise in the range of 63~2 000 Hz.