Vertical coupled dynamics of Maglev vehicle/guideway system with center spring ‎suspensions

Chen Xiaohao, Ma Weihua, Hu Junxiong, Zhang Min, Luo Shihui

Abstract


To investigate the mechanisms of the medium and low speed EMS maglev vehicle/track beam vertical coupled dynamic interaction. The air spring is in the middle of the suspension frame. The vertical dynamic models of medium and low speed maglev train with three levitation frames are established. By introducing active controller with feedback link and considering the influence of track irregularity, the Euler Bernoulli beam model is used for track beam model. On this basis, the medium and low speed maglev vehicle/track beam vertical coupled vibration model is built with whole process iteration method. Through the vibration test of the second-generation medium and low speed maglev vehicle, the accuracy of the maglev vehicle/track vertical coupling vibration model is verified. Using this model for simulation, the results show that the main vibration frequency of the maglev vehicle running on the elevated track beam is the first order vibration frequency of the track beam and its negotiation speed frequency. And, frequency absorption occurs when the negotiation speed frequency is close to the main vibration frequency. When frequency absorption occurs, negotiation speed frequency will become a main vibration frequency of track beam, when it doesn’t occur, negotiation speed frequency is almost not included, each characteristic frequency is the main vibration frequency of track beam, and, the proportion of each frequency varies with the negotiation speed. The higher-order vibration mode can’t be ignored in the calculating. And the coupling vibration amplitude of maglev vehicle/ track beam increases with increasing of negotiation speed.


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References


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