Low frequency lightweight vibration reduction of floating slab track based on amplitude magnification mechanism

被引：0

作者：

Yang Z. ^{[1
]}

Feng Q. ^{[1
]}

Cheng G. ^{[1
]}

Zhang L. ^{[1
]}

机构：

[1] State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure, East China Jiaotong University, Nanchang

来源：

Tumu Gongcheng Xuebao/China Civil Engineering Journal | 2024年 / 57卷 / 05期

关键词：

amplitude magnification; dynamic vibration absorber; floating slab track; lightweight vibration reduction; low frequency vibration;

D O I：

10.15951/j.tmgcxb.23040302

中图分类号：

学科分类号：

摘要：

To investigate the feasibility of achieving compatibility between lightweight and effective vibration reductions in low frequency vibration control of floating slab track, a lever-type dynamic vibration absorber (LT-DVA) is designed based on the amplitude magnification mechanism. A dynamic analysis model of a steel spring floating slab track with LT-DVA is established using the energy functional variation method. The effectiveness of the LT-DVA was verified by comparing it with the dynamic vibration absorber (DVA) using the force transfer rate and the displacement admittance as evaluation indicators. Building on this, we introduced multiple lever-type dynamic vibration absorbers (LT-MDVA) on the floating slab to achieve broadband control and high attenuation using the idea of multi-frequency control. The low frequency vibration isolation performance of LT-MDVA under dynamic wheel-rail forces and its effect on the dynamic response of the track structure are analyzed and verified. The results demonstrate that, due to the beneficial effect of the amplitude magnification mechanism (the amplitude magnification factor is α), the effective inertial mass, stiffness and damping of the LT-DVA is α2 times that of DVA with the same parameters, resulting in a working capacity equal to α2 times that of DVA. Based on the LT-DVA, the LT-MDVA offers a broadened vibration attenuation band and increased vibration attenuation capability. The LT-MDVA with a mass ratio of only 0. 02 effectively reduces the force transmitted to the lower foundation under dynamic wheel-rail forces (maximum attenuation is 7. 5 dB), compared to the ordinary steel spring floating slab track. Moreover, LT-MDVA also effectively reduces the response of the track structure (with maximum attenuation of 7. 2 dB and 7. 1 dB for rail and floating slab, respectively) and suppresses the vibration amplification phenomenon of the floating slab track, while the MDVA with the same parameters has almost no effect. These results demonstrate that the LT-MDVA can achieve a balance between lightweight and effective vibration reduction in low frequency vibration control of floating slab track. © 2024 Chinese Society of Civil Engineering. All rights reserved.

引用

页码：117 / 132

页数：15

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