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| Experimental Research on the Vibration Reduction Characteristics of the Vibration Reduction Turnout in Metro Depot |
| LIN Shan1, CHEN Yanming2, FENG Qingsong2 |
1. Guangzhou Metro Design and Research Institute Co. Ltd, Guangzhou, Guangdong 510010, China;
2. State Key Laboratory of Performance Monitoring Protecting of Rail Transit Infrastructure, East China Jiaotong University, Nanchang, Jiangxi 330013, China |
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Abstract Research purposes: Metro depot has the characteristics of many turnouts and track joints, small curve radius and low train speed, and the vibration reduction design of the track structure generally refers to the main line of the subway, and the actual vibration reduction effect is not clear. In order to understand the vibration reduction effect of double-layer nonlinear fastener in turnout in metro depot, the experimental research of vibration reduction turnout in metro depot was carried out.
Research conclusions:(1) The double-layer nonlinear fastener can reduce the vibration of the track bed and platform below the fastener layer, but the vibration of the rail above the fastener layer increases significantly. When the train speed is 20 km/h, the track bed and platform ground at the frog attenuate by 6.6 dB and 4.1 dB respectively, and the rail increases by 8.6 dB. (2) After using double-layer nonlinear fastener, the rail vibration increases in most frequency bands, especially in 10~20 Hz; the attenuation of track bed is obvious in 60~400 Hz; the attenuation of platform ground is mainly in 20~60 Hz, and there is a certain amplification in 5 Hz and 10 Hz. (3) The rail-bed transfer loss at the vibration reducing turnout is significantly greater than that of the ordinary turnout. When the vibration is transmitted from the rail to the track bed, the attenuation occurs in the range of 1 000 Hz, in which the attenuation is significant within 20 Hz, and the attenuation is more than 35 dB. (4) The research results in this paper can be applied to the field of vibration reduction design of railway engineering.
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Received: 11 August 2021
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2023, Vol. 40 
