Experimental study on the performance of constrained damped rail vibration

To study the vibration reduction performance of damped rail, we take the standard rail and labyrinth constrained damped rail as the study target. By testing the vibration performance of both standard rail and labyrinth constrained damped rail in an anechoic room, we use the time-domain analysis to study the vibration changes with time passing. The results showed that: the labyrinth constrained damped rail vibration can effectively reduce the vibration amplitude and duration. Under the radial impact load, compared to the standard rail, vibration acceleration attenuation of the labyrinth constrained damped rail is 5% -19%, time of vibration and attenuation greater than 94%; under the axial impact load, compared to the standard rail, vibration acceleration attenuation of the labyrinth constrained damped rail is 9% -21%, time of vibration and attenuation greater than 92%. The results have provided an experimental basis for the design of new constrained damped rail. Vibration is mainly generated by irregularity on the surface of rail and the wheel tread, and the vibration is eventually outputted by passing through the track structure. Therefore, the track structure as both the source of vibration and an important part of the vibration transmission has a direct impact on the final vibration effects. To study the vibration reduction performance from the perspective of vibration source and transmission is relatively reasonable and most effective [13] . With the rapid development of noise and vibration damping technology, it has achieved good results in the field of vibration and noise reduction [4] . Dr. Wei Pengbo and others in Beijing Jiaotong University studied the Beijing Metro Line 13 from Xizhimen to the Great Bell Temple by testing and comparing the rail and bridge deck with a general damped plate and the rail and bridge deck without a general damped plate. The results show that the rail installed with an ordinary damped board, the peak acceleration of the rail waist track reduces 6-7 dB, which has a certain vibration reduction effect [5] ; Professor Jiang Weikang in Shanghai Jiaotong University, who developed the SJTU-2-type vibration absorber, studied the rail transport in Shanghai line 3,4 from Zhongshan Park Station to Yan’an Road station within a range of 150m and found it also has some noise reduction effects [6] . In this paper, the vibration reduction analysis and comparison is conducted in an anechoic room for both standard rail and labyrinth constrained damped rail [7] , which has provided an