不同波段高低不平顺与车体垂向振动加速度关系分析  

Analysis of the Relationship between the Track Profile Irregularity and the Vertical Vibration Acceleration of the Vehicle Body in Different Frequency Bands

作　　者：闫子权 李再帏[3] 孙林林 YAN Ziquan;LI Zaiwei;SUN Linlin(State Key Laboratory of High-Speed Railway Track Technology,China Academy of Railway Sciences Group Co.,Ltd.,Beijing 100081,China;Railway Construction Research Institute,China Railway Research Institute Group Co.,Ltd.,Beijing 100081,China;School of Urban Rail Transit,Shanghai University of Engineering and Technology,Shanghai 201620,China)

机构地区：[1]中国铁道科学研究院集团有限公司高速铁路轨道系统全国重点实验室,北京100081 [2]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [3]上海工程技术大学城市轨道交通学院,上海201620

出　　处：《噪声与振动控制》2023年第6期168-172,共5页Noise and Vibration Control

基　　金：中国铁道科学研究院集团有限公司科研项目(2020YJ048)。

摘　　要：保证高速列车运行的平稳性与舒适性,是高速铁路运营的核心问题;高低不平顺作为车体垂向振动的主要激励源,其与车体垂向振动加速度的关系是基础性科学问题。为有效地构建高低不平顺与车体垂向振动加速度映射关系,首先,分析轨检数据的时域波形特点,利用二进制小波分析获取不同频段下高低不平顺与车体垂向振动加速度的时频分布特征;其次,引入分形维数计算方法,采用变差法计算高低不平顺与车体垂向振动加速度的分形维数;最后,利用线形回归分析方法构建两者间的映射关系。结果表明:高低不平顺与车体垂向振动加速度在时域波形极值处有一定的对应性;两者的分形维数随着波长的增加呈现逐渐减小的趋势,在波长大于8 m的区段的定量化映射关系明确;分形维数可为解决车体振动加速度超限问题提供新的思路,建议进一步地进行相关深化研究。Ensuring the stability and comfort of running high-speed trains is the core issue of high-speed railway operation.As the main excitation source of vertical vibration of the vehicle body,the relationship of the vertical vibration acceleration of the car body with the track irregularity is a fundamental scientific problem.In order to effectively construct the mapping relationship between the irregularity and the vertical vibration acceleration of the vehicle body,the time-domain waveform characteristics of the track inspection data are analyzed,and the time-frequency distribution characteristics of the irregularity and the vertical vibration acceleration of the vehicle body in different frequency bands are obtained by binary wavelet analysis.Then,the fractal dimension calculation method is introduced,and the fractal dimension of the irregularity and the vertical vibration acceleration of the vehicle body is calculated by the variation method.Finally,the linear regression analysis method is used to construct the mapping relationship between them.The results show that there is a certain correspondence between the irregularity and the vertical vibration acceleration of the vehicle body at the extreme value of the time domain waveform;the fractal dimensions of the two show a decreasing trend with the increase of the wavelength.The quantitative mapping relationship of the segment is clear for 8 m wavelength.The fractal dimension provides a new idea for solving the problem of vehicle body vibration acceleration exceeding the limit,and it is recommended to carry out further related in-depth research.

关 键 词：振动与波 高低不平顺 车体垂向振动加速度 小波分析 分形维数 

分 类 号：U213.244[交通运输工程—道路与铁道工程]