Active Control Of Curving Performance Of Railway Vehicles

Curve negotiation of railway vehicles has been the focus of railway vehicles dynamics research areas, which is viewed as an important index for evaluating vehicle performance. During curve negotiation, the wheelsets of vehicles generally misalign radially on the track that results in a series of problems such as the increase of the wheel/rail contact forces, wheel/rail wear, power consumption, risk of derailment and wheel/rail noise, etc. In order to solve these problems, many experts home and abroad have made a lot of theoretical and experimental researches, including the optimization of suspension parameters, changing of wheel/rail profiles, etc., in which the radial steering bogies and tilting trains are the most typical solution schemes.The active control technology has been the research focus since introduced into the field of railway vehicles. This thesis applies the active control concept to improve the curve negotiation of vehicles, and makes a thorough study and research upon radial bogies and active tilting train. Based on the researches, some new points of view are put forward. The thesis firstly outlines the background and current situation of the studies on vehicle curving performance. Then, from the perspectives of active control, the actuator control technologies are investigated systematically by using the vector control, direct torque control and fuzzy control; On this basis, the principle and performance of the controlled radial bogies and the tilting train mechanism are carefully analyzed, and reasonable schemes including frame-type radial bogies and linear motor-type tilting mechanism are suggested; The non-linear dynamic model of tilting train is established with the application of multi-body system dynamics analysis software SIMPACK, and the actuators control system model is set up by means of the dynamic simulation software MATLAB/SIMULINK. Then, the electromechanical coupling system model of the tilting train is obtained by the use of co-simulation technology. Finally, the dynamic performance of the tilting train is simulated. The emphasis is put on the studies on the main factors that influence the dynamic curving performance. The performance of the traditional types of bogie and tilting train is compared with performance of the new types suggested in this thesis. Therefore, this research reveals the advantages of the radial bogies and tilting train in the dynamic curve negotiation, and the feasibility and superiority of the new schemes.The simulation indicates that the application of the active control technology on the improvement of curving performance is reasonable and effective. Undoubtedly, it has very broad application prospect and high research value.