Research On Tilting Vehicle Based On Airspring Active Control Method

Using tilting train is one of important way to raise train speed without transforming the exsiting railroad. The tilting method of train is divided into passive tilting method and active tilting method, the active tilting method is devided into a variety of types such as Hydraulic actuator, electromechanical actuator and airspring actuator. The structure of hydraulic actuator and electromechanical actuator is very complicated so that they are very difficult to be repaird and it cost expensive. Airspring is most common in the secondary suspension. The purpose of carbody tilting could also be reached by controling airspring’s height. The structure of airspring actuator is more simple compared with other kinds of actuators. The carbody and bogie needn’t to be transformed so that they have light weight advantage. The tilting angle of cabody usually could be most of2°by the limit of airspring’s structure. But the train speed could also be raised ten present and the dynamic performance of tilting train is well. Airspring tilting method is suitable for minor radius curves which running speed are limited.This paper is based on multibody system dynamics theory, airspring theory and active control theory. The multibody system dynamic models of tilting car is set up in SIMPACK. The vertical mathematical models of airspring and the active control models are set up in MATLAB/SIMULINK. Then the tilting train models of airspring active control is simultaneous by using SIM AT Co-simulation.The tilting vehicle is simulated by SIMAT Co-simulation. The dynamic performance of vehicle is analysed by GB5599-1985and95J01-M standards and compared with original vehicle in the same condition of curves and running state. The analysis results show that all the dynamic performance index of tilting vehicle are meet requirements of the standards and each of the index is increased by vehicle speed. Unbalanced centrifugal acceleration of tilting vehicle is decreased obviously compared with original vehicle so that it enhance the comfort of passengers. The differences of derailment coefficient and bogie lateral force between tilting vehicle and original vehicle is unconspicuous but the wheel road reduction ratio of tilting vehicle is decreased obviously compared with original vehicle.The influence of tilting vehicle’s running behavior that generated by the change of charging and exhaust rate of airspring, lateral span of airsprings, rolling stiffness of antiroll bar and tilting failure is studied. The analysis results show that the unbalanced centrifugal acceleration, angular velocity and angular acceleration of carbody are influenced by charging and exhaust rate obviously. The lateral span of airsprings should be decreased to fit the structural requirements of airspring. The rolling stiffness of antiroll bar should be at most of0.6MN·m·rad-1to ensure the security of airspring. The unbalanced centrifugal acceleration and the wheel road reduction ratio of vehicle are increased obviously when tilting is failed.The active control method of aispring, dynamic performance of tilting vehicle and the influence of running behavior and passengers’ comfort with different parameters that are studied in this paper found the theoretical basis of the research of active control tilting vehicle with airspring.