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| Effects of Parameters of CRTS Ⅱ Slab Track on Frequency Responses of High-speed Vehicle |
| XU Jin-hui1, WANG Xin2, HUANG Da-wei1, WANG Biao3 |
| (1. Engineering Research Center of Railway Environment Vibration and Noise, Ministry of Education, East China Jiaotong University, Nanchang, Jiangxi 330013, China; 2. Key Laboratory of High- speed Railway Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu, Sichuan 610031, China; 3. Sichuan Ren-mu Expressway Co. Ltd, Chengdu, Sichuan 610015, China) |
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Abstract Abstract：Research purposes： To study the effects of structural parameters of CRTSⅡ slab track on the operation quality of vehicles, a dynamic analysis model of high speed vehicle - CRTSⅡ slab track vertical coupling system was established. Frequency analysis method and symplectic method were combined to solve the frequency responses of the coupling system, and the influence on frequency responses of high speed vehicle of slab thickness, concrete supporting layer thickness, stiffness and damping of fastening system, elastic modulus and damping of CA mortar was studied. Research conclusions： (1)The track parameters have negligible influence on the vibration of car-body and bogie, but have large influence on wheel-rail vertical force and wheel-set vertical acceleration. (2)The thickness of slab should not be too large or too small. If the thickness of slab is too large, the vibration in the range of 50~70 Hz of wheel-set vertical acceleration and wheel-rail vertical force will be increased. In turn, if the thickness of slab is too small, the vibration in the range of 30~50 Hz of wheel-set vertical acceleration and wheel-rail vertical force will be increased too. (3)Under the premise of satisfying track structure strength, appropriately reducing the thickness of concrete supporting layer can decrease wheel-set vertical acceleration and wheel-rail vertical force. (4)Under the premise of satisfying track geometry and track dynamic displacement, adopting fastening system with small stiffness and large damping can decrease wheel-set vertical acceleration and wheel-rail vertical force. (5) The research results can provide a theoretical basis for the design of CRTS II slab track and promote the development of China's high speed railway.
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Received: 07 August 2017
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2018, Vol. 35 
