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| Research on the Low Frequency Vibration Attenuation in Track Structure Based on TRIZ Theory
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| YANG Ji-zhong1, YAN Hua1, WEI Yong-xing1, ZHENG Xiao-yan1, YUAN Zhi-gang1, CAI Cheng-biao2
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| 1. China Railway Eryuan Engineering Group Co. Ltd, Chengdu, Sichuan 610031, China; 2. Southwest Jiaotong University, Chengdu, Sichuan 610031, China |
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Abstract Abstract：Research purposes： Based on the theory of inventive problem solving (TRIZ), aiming at the traditional FST′s phenomenon of low-frequency vibration amplification, the corresponding solutions were proposed in the FST′s design scheme for low-frequency vibration attenuation by inventive principle, flow analysis and other tools. Finally numerical simulation of vibration attenuation effect was carried on one of the schemes.
Research conclusions：(1) By the spatial separation principle, the "separated" slab track structure was put forward to resolving the physical contradiction in which the supporting stiffness under the slab must be lower to control vibration, at the same time, it must remain higher to hold the rail in smaller displacement. (2) In order to eliminate the influence of low-frequency vibration amplification, according to the flow analysis method, the FST's slab was elastically coupled with an additional mass resulting in a phase-inverted vibration flow at the similar frequency of FST. The resulting structure is called passive dynamic vibration attenuation floating slab track. (3) By the multi-body system dynamics (MSD) and finite element method (FEM) technologies, the vehicle-passive dynamic vibration attenuation floating slab track model was established. The results showed that the scheme could effectively suppress the traditional FST's low-frequency vibration at about 13 Hz (1st mode), the maximum of its vibration acceleration decrease from 1.06 m/s2 to 0.25 m/s2, a 76% decline. (4) The research results can provide references for design of low frequency vibration damping track structure.
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