In order to analyze the vibration reduction effect of rubber pad floating slab track under different wheel-rail irregularity conditions,a comparative in-situ test was performed on two measuring sections including regular ballastless slab track and rubber pad floating slab track(RPFST)in the same straight section of a subway line.The net operating mileage of operating trains and wheels irregularities were synchronously investigated.The results show that when evaluating the vibration control performance of the vibration-damping track,in addition to the objective evaluation of the insertion loss or comparison loss,it is more critical is to analyse whether the vibration responses of the vibration-damping track section will exceed the vibration limit with the enhancement of wheel-rail excitation.The wheels of operating trains on the tested subway line exhibit obvious seventh-to-ninth order polygonal wear characteristics,and with the enhancement of wheel-rail excitation,the evaluation result of△VLZ,max gradually increases.The frequency division vibration reduction effect of RPFST is directly related to the excitation mechanisms of different frequency bands.At the natural frequency(63 Hz)of the fastener system,the increase in wheel-rail excitation leads to a greater increase of the tunnel wall vibration response of regular ballastless slab track;and the comparison loss at 63 Hz increases with the increase of net operating mileage.
关键词
地铁/橡胶垫浮置板轨道/减振效果/轮轨激励/列车振动
Key words
Metro/Rubber pad floating slab track/Vibration reduction effect/Wheel-rail excitation/Train-induced vibration
维普
万方数据