The Study Of Hunting Wave In Urban Rail Transit Viaduct Based On Time-frequency Analysis

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.