扣件胶垫阻尼的频变性对地铁隧道环境振动的影响

发布时间：2018-04-19 19:54

本文选题：地下铁道 + 隧道　；参考：《中国铁道科学》2015年03期

【摘要】：以地铁隧道内常使用的DT VI2型扣件为研究对象,采用车辆—轨道垂向耦合随机振动频域分析模型与有限元谱分析模型组合求解法,研究扣件胶垫阻尼的频变性对地铁隧道环境振动的影响。结果表明:与常量的扣件胶垫阻尼相比,随频率变化的扣件胶垫阻尼对地铁隧道环境低频振动影响很小,但会增大其分频最大振级,同时还会降低其分频最大振级以上频带内的振动水平,并且随着频率的持续提高,振动级的下降幅度也会越来越大;尽管可以通过单纯降低胶垫阻尼系数提高地铁隧道环境振动频域的预测精度,但难以保证对各频段振级均有较高的预测精度,因此,如不考虑扣件胶垫阻尼的频变性,易低估地铁隧道环境振动的分频最大振级,同时会高估主频段以上的振动水平。
[Abstract]:Taking DT VI2 fastener commonly used in subway tunnel as the research object, the combination of frequency domain analysis model of vertical coupling random vibration of vehicle and track and finite element spectrum analysis model are used to solve the problem. The influence of frequency variation of fastener cushion damping on the environmental vibration of subway tunnel is studied. The results show that, compared with the constant damping of fastener, the damping of fastener with frequency has little effect on the low frequency vibration of subway tunnel, but it will increase the maximum vibration level of frequency. At the same time, it will reduce the vibration level in the frequency band above the maximum frequency level, and with the continuous increase of the frequency, the decline of the vibration level will become larger and larger. Although the prediction accuracy of environmental vibration frequency domain of subway tunnel can be improved by simply reducing the damping coefficient of rubber cushion, it is difficult to ensure a high prediction accuracy for each frequency band vibration level. Therefore, if the frequency variation of the damping of fastener is not considered, It is easy to underestimate the maximum vibration level of the environmental vibration of subway tunnel and overestimate the vibration level above the main frequency band.
【作者单位】：高速铁路线路工程教育部重点实验室;西南交通大学土木工程学院;南京工业大学交通学院;
【基金】：国家自然科学基金—铁道基金联合资助项目(U1434201,U1234201) 国家自然科学基金青年科学基金资助项目(51008257,51008158) 国家杰出青年科学基金项目(51425804) 四川省科技支撑计划项目(2014GZ0003)
【分类号】：U211.3;U213.53;U451

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