Research On Semi-active Control Of Lateral Suspension Systems Based On Adaptive Control Theory

Transport capacity is not only the propeller of the development for the economy, but also is one main part of transport capacity, therefore the development of the railway is quite important. The capacity of the railway’s transportation has been enhanced by the new high speed railway’s building, which needs the train to increase the speed. The lateral vibration was not clear when the train was running in the low speed, which was not concerned. The harshness of the track not only significantly affects the running of train, results in increased lateral vibration but also influents the comfort and smooth of the train. Therefore reducing lateral vibration of the train has become a serious problem.Direction and horizontal track irregularity signal is simulated numerically depend on the basic principles of the train’s vibration. Train lateral semi-active suspension adaptive control system is designed, which is constructed by MATLAB/Simulink, and studied by simulation. The specific content of the work is mainly composed by the following areas:(1) The Necessity for semi-active suspension system of the train is analyzed. Three kinds of suspension characteristics are compared by the analysis of the passive suspension system, the active suspension system and the semi-active suspension system. Advantages and necessity of the semi-active suspension system is given. Common control strategies are analyzed.(2) Direction and horizontal track irregularity signal is numerically simulated by using the power spectrum of the German rail.17degrees of freedom train lateral suspension system Simulink model is constructed in MATLAB/Simulink environment.(3) Minimum variance control system, self-tuning pole placement control system, self-tuning PID control system and MIT model reference system are designed by using adaptive control theory. Four semi-active suspension adaptive control systems are simulated in different speed. The control effects of the minimum variance self-adaptive system,the pole placement self-tuning control system, self-tuning PID control system and MIT model reference adaptive control system are all compared in the same speed. The simulation results are analyzed according to the relevant comfort index. The experiment results show self-tuning PID lateral semi-active suspension control system contain both of the adaptive and robustness, which is more suitable for the semi-active suspension system of the train.