轨道减振器与弹性支承块或浮置板轨道组合的隔振性能分析

On effectiveness of vibration isolation for super-elastic rail support combined with booted sleeper or floating slab track

轨道交通运行引起的地面振动或高架轨道的高架桥结构振动源于轨道结构振动,对于几十赫兹到几百赫兹频率范围的轨道结构振动,应用轨道减振器、弹性支承块和浮置板可以得到比较好的减振降噪效果。本文在频域建立了轨道结构模型和车辆-轨道系统相对位移激励模型,分析计算了钢轨垫片/轨道减振器-弹性支承块/浮置板轨道结构的隔振性能,以及相对位移激励下轮轨间动载荷和传递给基础的力。结果表明,与垫片-弹性支承块/浮置板轨道相比,轨道减振器-弹性支承块/浮置板轨道组合可以在中频范围大大降低轮轨动态作用力,并且在中、高频段具有更好的隔振性能。

Ground vibration or structural vibration of viaduct due to railway traffic can be reduced by use of super-elastic rail support, booted sleeper and floating slab to isolate vibration transmission from the track to the infrastructure. In this study modeling in the frequency domain of track structure and wheel/rail interaction is carried out. Wheel/rail interaction and trans- mission to the infrastructure of the interaction force due to relative displacement excitation are simulated. The effectiveness of vibration isolation is analyzed for booted sleeper or floating slab combined with super-elastic rail fastener. It is found that the combination of super-elastic rail fastener with booted sleeper or floating slab can effectively reduce the wheel/rail interaction force in the medium frequencies, compared with the booted sleeper or floating slab track using usual rail pad. The combination also shows better ability to block vibration transmission from the track to the infrastructure in the medium and high frequencies.