Study On Modal Parameters And Ride Quality Of The Maglev Vehicle

Maglev train is a new type of ground tracked transport tool, which advantages such as non-contact suspension and propulsion, super speed run, comfortable ride quality, friendly environment compatibility are attractive and competitive in the 21 century. In the past thirty years, the research and development in maglev technology had made a great progress. Nowadays, German high-speed electromagnetic suspension (EMS) transport system-Transrapid and Japanese electrodynamic suspension (EDS) maglev train-MLX01 and HSST-100 are ready to the revenue application. The success of Shanghai maglev line indicates the beginning of commercialization for high speed maglev. At present, shanghai high-speed maglev railway adopts the German Transprapid technology. In order to promote the development of high maglev transport in china, realizing national production of maglev train has great significance. However, it is well know that the dynamic responses of maglev ground transportation system have important consequents for system safety and ride comfort of passenger, guide way design, and system costs. So the study of maglev vehicle system dynamics is necessary and important to boost the application technology of maglev railway in our country.The differences of study object lead to emphasizing particularly on different contents of the model. In this dissertation, studies on the random vibration and ride quality of the car body of maglev train, the electromagnetism force is predigested to spring-damper force, the suspensions of the whole maglev train is modeled as detailed as possible. First, using the Matrix Assembling Law to attain the matrixes of mass, stiffness and damping of the maglev train's vertical and lateral model is studied on, and then the Matlab/Simulink is employed to simulate the whole maglev train in the time domain and validate it.Veracity of the system excitation is all-important for feasible degree of simulation results. In Chapter III, the three-subsection PSD model of guide way irregularities considering the special characteristics of guide way construction and the irregularity managements is introduced to simulate random excitation of guide way. The guide way irregularities signal obtained by applying the Time-Frequency Inverse Technique to invent the PSD model of guide way in the time domain which can be used in the time domain simulation.The modal parameters are the inherent parameters of the maglev vehicle, which represent the inherent characteristics of the vibration system. Dynamic performance of product is basically ascertained after them manufactured completely. In the Chapter IV, Modal Analysis Theory is applied to analyzing the maglev vehicle's computational model.The ride quality is an important dynamic performance to maglev vehicle. In the Chapter V, Pseudo-excitation algorithm is a brand-new method introduced to analyze the random vibration and study the ride quality of maglev vehicle. The Sperling index, response spectrum, amplitude spectrum and RMS value are included in the analysis. And then, Taking ride quality as target, the optimum analysis of the second suspension is carried out.The frequency constitute of rail irregularity wavelength has effect on the ride quality. In the Chapter VI, according to studying the relation between the ride quality of maglev vehicle and the rail irregularity wavelength, some theory basis is supplied through the management and maintenance of maglev irregularity. In the finality, the problems requiring further studies are discussed.