跨座式单轨列车-桥梁系统随机振动分析

周智辉; 肖舒晴; 何旭辉; 菅振华; 蔡陈之

doi:10.19713/j.cnki.43-1423/u.T20222166

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跨座式单轨列车-桥梁系统随机振动分析

桥梁隧道与结构 | 更新时间：2023-12-05

- 跨座式单轨列车-桥梁系统随机振动分析
- Random vibration analysis of the straddle type monorail train-bridge system
- 铁道科学与工程学报 2023年20卷第11期页码：4210-4220
- 作者机构：
  
  1.中南大学土木工程学院，湖南长沙 410075
- 作者简介：
  
  蔡陈之(1989—)，男，湖南益阳人，副教授，博士，从事车-桥耦合振动研究；E-mail：chenzhi.cai@csu.edu.cn
- 基金信息：
  
  国家自然科学基金资助项目(52378546)
- DOI：10.19713/j.cnki.43-1423/u.T20222166
  中图分类号：
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周智辉,肖舒晴,何旭辉等.跨座式单轨列车-桥梁系统随机振动分析[J].铁道科学与工程学报,2023,20(11):4210-4220.

ZHOU Zhihui,XIAO Shuqing,HE Xuhui,et al.Random vibration analysis of the straddle type monorail train-bridge system[J].Journal of Railway Science and Engineering,2023,20(11):4210-4220.
周智辉,肖舒晴,何旭辉等.跨座式单轨列车-桥梁系统随机振动分析[J].铁道科学与工程学报,2023,20(11):4210-4220. DOI： 10.19713/j.cnki.43-1423/u.T20222166.

ZHOU Zhihui,XIAO Shuqing,HE Xuhui,et al.Random vibration analysis of the straddle type monorail train-bridge system[J].Journal of Railway Science and Engineering,2023,20(11):4210-4220. DOI： 10.19713/j.cnki.43-1423/u.T20222166.

摘要

由于跨座式单轨轨面不平顺激励具有随机特性，所以跨座式单轨列车-桥梁系统动力响应的随机性值得探讨。通过建立跨座式单轨列车-桥梁系统随机振动分析模型，分析在大量不平顺样本组作用下跨座式单轨列车-桥梁系统动力响应的离散性。研究基于虚拟激励法的跨座式单轨列车-桥梁系统的随机振动分析方法的计算精度和效率，对比分析跨座式单轨列车-桥梁系统基于虚拟激励法的随机分析方法和基于单样本组的确定性分析方法所得的动力响应随车速的变化规律。研究结果表明：跨座式单轨列车-桥梁系统的大多数响应具有很大的离散性，开展跨座式单轨列车-桥梁系统随机振动分析是必要的；验证了基于虚拟激励法的跨座式单轨列车-桥梁系统随机分析方法具有很高的精度，在同等精度条件下，虚拟激励法的计算效率明显高于Monte Carlo法；论证了仅作单个确定性样本的速度影响分析并不能确切反映跨座式单轨列车-桥梁系统响应随车速变化规律，进一步论证了开展跨座式单轨列车-桥梁系统随机振动分析的必要性；从概率统计的角度分析了跨座式单轨车辆及轨道梁的位移与加速度响应随车速的总体变化规律。研究成果可为跨座式单轨列车-桥梁系统随机振动进一步的研究提供依据和参考。

Abstract

In consideration of the randomness characteristics of the track irregularity of the straddle type monorail, the randomness of dynamic response of the straddle type monorail train-bridge system was worth discussing. Firstly, the vibration model of the straddle type monorail train-bridge system was established to analyze the randomness characteristics of the dynamic response of the train-bridge system using a large number of track irregularity sample. Then, the calculation accuracy and efficiency of the random vibration analysis method of the train-bridge system based on Pseudo Excitation Method was investigated. Finally, the effects of the train speed on the dynamic response of the train-bridge system were analyzed using both pseudo excitation method and the deterministic analysis based on the excitation of single sample. The results show a significant randomness for most dynamic responses of the straddle type monorail train-bridge system, which indicates the necessity for the random vibration analysis of the train-bridge system. It is verified that the random analysis method of the straddle type monorail train-bridge system based on pseudo excitation method has high precision. The computational efficiency of pseudo excitation method is significantly higher than that of Monte Carlo method under the same accuracy condition. The deterministic analysis method based on single sample group cannot accurately reflect the dynamic response of the straddle type monorail train-bridge system with the change of the train speed. It further verifies the essentiality of random vibration analysis of the train-bridge system. The general variation law of displacement and acceleration of vehicle and track beam with train speed has been analyzed from the perspective of probability statistics. The research results can provide the basis and reference for the further study of random vibration of the straddle type monorail train-bridge system.

关键词

跨座式单轨列车-桥梁系统随机振动虚拟激励法

Keywords

straddle type monorail traintrain-bridge systemrandom vibrationpseudo excitation method

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