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| Measurement and Analysis of the Vibration - ：:tenuating Mfect of Rail Suspension Fasteners on Subway Vibration |
| WEI Kai，LIANG Ying -chun，ZHANG Pan，WANG Ping |
| (MOE Key Laboratory of High - speed Railway Engineering，Southwest Jiaotong University，Chengdu，Sichuan 610031， China) |
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Abstract Abstract ： Research purposes ： In order to control subway vibration in our country，many kinds of track structures were adopted. As a new vibration - control technique， the suspension fasteners are rarely used in China， and its actual vibration - alleviating effect is still unclear. Therefore，some field tests should be carried out to facilitate design of subway track. Research conclusions :Acertain section of the metro line 2 in Chengdu was chosen to test the vertical ground vibration accelerations before and after replacing rail fasteners. The test results in both time and frequency domains were compared. The compared results show that: (1) The time - domain vertical ground vibration accelerations would transform from several concentrated vibrations to the decentralized and uniform ones after replacement of the DZ Ⅲrail fasteners witli rail suspension fasteners. Besides，the time - domain peak particle accelerations caused by rail suspension fasteners is less than 50% of that caused by the DZ Ⅲ rail fasteners. (2 ) The vibration - reduction effect of rail suspension fasteners is more remarkable in the 1/3 octave center frequencies of 50 ?160 Hz. Compared with common rail fasteners，the highest decrease of !"zmax in the 1/3 octave center 50 ~ 160 Hz is 21 dB. (3) The integrated VLx 1/3 octave center frequencies of 1 ~ 160 Hz at all measuring positions are ranged from 57. 3 dB to 68.3 dB，mostly less than China, standard threshold of 65 dB，after application of rail suspension fasteners. (4)The research results can be used in control of subway vibration and noise.
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Received: 24 November 2015
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2016, Vol. 33 
