Research On The Turning Movement Of High Speed Maglev Train

Turning-capability is an important guideline to evaluate the performance of a maglev train system. Smaller radius of turning will help to increase the adaptability of the guideway, avoid unnecessary demolition, and then reduce the construction cost. Turning capacity of high-speed maglev train is restricted not only by the structure of the walking-mechanism, but also by the guidance performance while running along the guideway. This dissertation studies on the turning-capability of high speed maglev train from two aspects, with one is kinematics of the walking mechanism, and the other is the dynamics of the guidance system.Research on the kinematics of the walking-mechanism. First, the basic structure of the walking-mechanism and the guidance system in high-speed maglev trains are introduced. Based on the analysis of the constraints of the connection between different components of the walking-mechanism, and the constraints that the electromagnets will track the guideway and that the carriage is a rigid body, three key factors that effect the turning-capability of maglev train are proposed, which are the guidance gap, the changes of the metal-rubber connecting different bogies, and the sway-angle and the pulling force of the pendulum pole. Moreover, the analytic equation of the difference of the guidance gap between the middle and the end of the guidance magnet, the variety of the shape of the metal-rubber, and the sway-angle and pulling force of the pendulum pole are presented. Based on the obtained conclusions, the initial improvement scheme of structure of the existing TR maglev is given to achieve the turning-capability of 150m.Research on the dynamics of the guidance system. To build the mathematical model of the dynamics of the guidance system of the dual-suspension-bogie, the forces on the dual-suspension-bogie on the curving line are analyzed, which gives the mathematical description of the side-force of the pendulum pole, the side-force of the suspension force, the effect-force from the joint-magnet. Based on the distribution character of the guidance force, the simplified form of the equation to calculate the guidance force and moment is obtained. On the basis of these results, the moving and rotational side-movements of the dual-suspension bogies are analyzed, which lead to the mathematical model of the dynamics of the guidance system. Based on the obtained model, the tracking performance of the dual-bogies and the variety of the guidance gap are analyzed. Finally, the dynamics of the dual-suspension-bogies running along the curving part of the guideway is simulated in Matlab, the results of which show that, the existing guidance-system can realize the control of the rotational movement of the bogies, while the change of the gap is large, and that the speeds of the vehicle greatly effects the guidance control system along the curving guideway, and that the rotational control ability of the guidance system should be improved to obtain a better tracking performance of the bogie along the guideway.