The Research Of Characteristics And Key Technologies Of Air Suspension In Low-Speed Maglev Train

Research of maglev train technology not only pursue a higher speed, but also pursue a better movement quality. The air spring suspension system can be used not only to solve the problem of mechanical decoupling, but also meet the requirements of movement quality. The air spring can inflate or exhaust along with the load change. It can make the compartments maintain at the certain height, and can maintain the base frequency to be nearly invariable under any load, enable the suspension unit to have extremely steady performance. But because of the lateral instability of free constrained diaphragm air spring, we have to add the lateral spacing devices, which would influence the vertical characteristics of suspension and suspension control system. It is the most urgent problem of the suspension on maglev train. In this article, taking the air spring suspension system in low-speed maglev train as the goal, carry out in-depth research and analysis, and propose an improved design to the structure of air suspension system. Specific details are as follows:1. Study and discuss the structural characteristics and application advantages of the free membrane-type air spring. Analyze and compare the structure and characteristics of kinds of air spring suspension, and then propose an improved design to the lateral rod-style structure. The design is called limited lateral constrained diaphragm air spring suspension. In the new design, the lateral load is withstood by the contact pressure between trough sidewall and the air spring. So to ensure that air suspension can withstand larger lateral force, reduce the effect to vertical characteristics, and simplify the structure of the bogie.2. In view of the structural features of free constrained diaphragm air spring on maglev train, integrate a large number of materials about the theoretical analysis method of the air spring, revise the vertical and lateral stiffness formula of free constrained diaphragm air spring, analyze the stiffness formula of free constrained diaphragm air spring in the lateral limited constrained structure.3. Establish the finite element model of free constrained diaphragm air spring by finite element analysis software ANSYS. Analysis the shape and stiffness of free constrained diaphragm air spring and limited lateral constrained diaphragm air spring suspension with different inflation pressure and load.4. Synthesize the results of theoretical analysis and finite element simulation, calculate the space between the air spring and the trough sidewall, and the height difference between up cover of air spring and trough sidewall. Prove the feasibility of the limited lateral constrained diaphragm air spring suspension.