中低速磁浮轨道结构垂向振动传递特性研究

徐畅1,赵坪锐1,徐天赐1,屈超广1,刘卫星1,蔡文锋2

振动与冲击 ›› 2022, Vol. 41 ›› Issue (16) : 43-49.

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (16) : 43-49.
论文

中低速磁浮轨道结构垂向振动传递特性研究

  • 徐畅1,赵坪锐1,徐天赐1,屈超广1,刘卫星1,蔡文锋2
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Vertical vibration transfer characteristics of a medium-low speed maglev track structure

  • XU Chang1,ZHAO Pingrui1,XU Tianci1,QU Chaoguang1,LIU Weixing1,CAI Wenfeng2
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摘要

为研究中低速磁浮轨道结构的垂向振动传递特性,基于室内试验与振动理论,建立轨道结构频域分析模型,以结构垂向导纳,位移与力的垂向传递率为评价指标分析了结构的垂向振动传递特性。探究了扣件垂向刚度、扣件垂向阻尼、轨枕支承间距、F轨顶面厚度以及轨枕翼缘厚度对于结构垂向振动传递特性的影响。研究表明:中低速磁浮轨道结构的垂向振动可分为低频整体振动与高频局部振动两个阶段,且结构整体振动时力与位移的垂向传递率较高;F轨沿结构纵向上的垂向位移导纳变化并非随着与激励点距离的增大而减小,而是与结构在不同频率下的振型有关;扣件垂向阻尼增大对力与位移的垂向传递均有抑制作用,其中对于力的垂向传递抑制更加明显;扣件垂向刚度、轨枕支承间距、F轨顶面厚度以及轨枕翼缘厚度都会使结构局部刚度发生改变,从而影响力与位移垂向传递的峰值与频率。
关键词:中低速磁浮轨道;垂向振动传递;导纳;垂向传递率

Abstract

In order to study the vertical vibration transfer characteristics of medium-low speed maglev track structure, based on laboratory test and vibration theory, the frequency domain analysis model of track structure was established. The vertical vibration transfer characteristics of the structure were analyzed by the vertical admittance of the structure, the vertical transmissibility of displacement and force were taken as the evaluation index. The influences of vertical fastener stiffness, vertical fastener damping, sleeper support spacing, top thickness surface of the F-rail and sleeper flange thickness on the vertical vibration transmission characteristics of the structure were discussed. The results show that the vertical vibration of medium-low speed maglev track structure can be divided into two stages: low frequency overall vibration and high frequency local vibration, and the vertical transmissibility of force and displacement in the whole vibration stage is higher. The vertical displacement admittance of F-rail along the structure does not decrease with the increase of the distance from the excitation point, but is related to the vibration mode of the structure at different frequencies. The increase of vertical damping of fastener can restrain the vertical transmission of force and displacement, and the inhibition of vertical transmission of force is more obvious. The vertical fastener stiffness, sleeper support spacing, top thickness surface of the F-rail and sleeper flange thickness all change the local stiffness of the structure, thus affect the peak value and frequency of vertical transmission of force and displacement.
Key words: Medium-low speed maglev track; Vertical vibration transmission; Admittance; Vertical transmissibility

关键词

中低速磁浮轨道 / 垂向振动传递 / 导纳 / 垂向传递率

Key words

Medium-low speed maglev track / Vertical vibration transmission / Admittance / Vertical transmissibility

引用本文

导出引用
徐畅1,赵坪锐1,徐天赐1,屈超广1,刘卫星1,蔡文锋2. 中低速磁浮轨道结构垂向振动传递特性研究[J]. 振动与冲击, 2022, 41(16): 43-49
XU Chang1,ZHAO Pingrui1,XU Tianci1,QU Chaoguang1,LIU Weixing1,CAI Wenfeng2. Vertical vibration transfer characteristics of a medium-low speed maglev track structure[J]. Journal of Vibration and Shock, 2022, 41(16): 43-49

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