【作者】 乔洋；

【导师】 於永和；

【作者基本信息】 广西工学院 ， 结构工程， 2010， 硕士

【摘要】 列车-桥梁系统横向振动激振源一直以来都是一个难以确定的问题,横向振动也是列车的脱轨与否的重要原因之一,随着我国铁路系统的建设列车脱轨问题也是时有发生,而且发展城际列车的方案也已提到了日常议程上来,所以研究其激振源问题就更是迫在眉睫,从能量的角度提出横向振动波(又名蛇行波)理论就将此问题的研究大大的精确化,蛇行波的研究对预测车桥系统的振动响应具有重要的实用价值,传统的方法主要是采用Monte-Carlo法来研究蛇行波,但随着其他领域分析方法的发展与完善,已经有很多方法可以用来分析蛇行波,时频分析就是一种很好的选择。本文以横向振动激振源蛇行波为研究的基础,围绕蛇行波展开讨论,研究轻轨高架桥的振动,找出其他领域更好的研究蛇行波的方法,提高列车运行的安全性,引述车桥耦合系统以蛇行波为激振源的合理性,为研究我国城市列车桥梁系统的研究增加一定的理论基础。时频分析方法作为分析非平稳信号的有利工具,成为现代处理信号的主要手段。蛇行波信号属于一种非平稳信号,研究的方法集中在替换传统的Monte-Carlo方法,系统的介绍时频分析的概念、性质,引述其常用分析信号的方法:短时傅里叶变换,小波分析,Wigner-Ville分布。经过仿真软件Matlab对所选用的时频分析方法的对比发现,平滑伪Wigner-Ville分布结合重排谱图的方法能够很好的分析蛇行波。更多还原

【Abstract】 It is difficult to determine the source of train-bridge system’s transverse vibration. Transverse vibration is an important problem for train derailment or not, with the construction of railway system in China, train derailment problem surfaces from time to time, and the development of inter-city training system has also been referred to the daily agendas, then study its excitation source is a even more pressing issue. From the angle of energy theory, transverse vibration wave (also known as the hunting wave) lets this problem more precise, the study of hunting wave for forecasting the response of vehicle-bridge’s vibration has important practical value, in the passed mainly used Monte-Carlo method to study it, but along with the development and improvement of other areas, there are many ways to analyze hunting wave, time-frequency analysis is a good choice.Regard the hunting wave as the basic to study, around hunting wave to discuss ,study the vibration of light rail viaduct, find out better way to study it in other areas, and improve the security of train, quote the rationality of vehicle-bridge system’s theory based on hunting wave, and to fulfill the theories of urban high-speed rail system.Time-frequency analysis as a powerful tool for non-stationary signals, becomes the main means of modern signal processing. Hunting wave is a non-stationary signal, the study focuses on abandoning the traditional method of Monte-Carlo, introducing the concept and nature of time-frequency and diciting common methods of signal analysis:short time Fourier transform, wavelet advantages, Wigner-Ville distribution.The simulation software Matlab on the selected time-frequency analysis methods of comparison, the smoothed pseudo Wigner-Ville distribution method combined with rearrangement of spectrum analysis can be a good way to study hunting wave.更多还原