钢弹簧浮置板轨道结构模态及动力性能参数分析

Analysis on Modal and Dynamic Performance Parameters of Steel Spring Floating Slab Track Structure

钢弹簧浮置板轨道与普通整体式道床相比,具有较好的减振降噪的功能。通过钢弹簧浮置板轨道结构模态分析不同结构参数对道床板固有频率的影响,发现浮置板固有频率随着隔振器刚度的增大而增大,随着隔振器间距的增大而减小,并且模态阶数越高,固有频率间的差距越小;但是道床板的固有频率随板长的增大而减小。在以上参数的基础上,对轨道结构的动力响应进行分析,得到了钢轨和道床板的垂向位移、垂向加速度、横向加速度以及隧道壁垂向加速度随结构参数的变化趋势,可为钢弹簧浮置板设计、参数选定和结构优化提供参考。

Compared with the ordinary monolithic track bed,the steel spring floating slab track has better vibration and noise reduction functions.The influence of different structural parameters on natural frequency of the track bed slab is analyzed through modal analysis of steel spring floating slab track structure.It is found that natural frequency of the floating slab increases with increase of stiffness of vibration isolator,and decreases with increase of distance of vibration isolator;and the higher the modal order,the smaller the gap between the natural frequencies;but the natural frequency of the track bed slab decreases with the increase of the slab length.On the basis of the above parameters,the dynamic response of the track structure is analyzed,and vertical displacement,vertical acceleration,and lateral acceleration of the rail and track bed slab,as well as vertical acceleration of the tunnel wall with the change trend of the structural parameters are obtained,which can provide reference value on design of the spring floating plate,selection of parameters,and optimization of the track structure.