Study On Control Schemes Of The Railway Vehicle Lateral Semiactive Suspension

The ride comfort of the railway vehicle is seriously depended on the suspension system's efficiency. Improving ride comfort of high-speed trains using high- efficiency suspensions is economical and effective, which is very beneficial to the train speed raising project in our country.Active and semiactive suspensions are considered as the future of vehicle suspensions. Two concepts of skyhook control and H_∞ control are studied and the single railway vehicle is regarded as research object in this paper.Control principles of the skyhook and H_∞ control are specified and the two controllers is designed based on principle-analysis. Computer simulation using the car model built in ADAMS software is conducted to compare and investigate the two control concepts and controller parameters' effects on the control efficiency are summarized based on simulation results. It can be validated by simulation results that active suspensions have a better efficiency in car body vibration control than semiactive suspensions and semiactive suspensions better than unactive suspensions. It also can be seen that improving controller efficiency must result in deterioration of the system robust. Semiactive suspension only can produce the target suspension force demanded by the controller approximately, so semiactive suspensions using higher efficiency controller must not have a higher vibration control efficiency. Controller design must consider the efficiency and robust at the same time.The experimentation using magneto-rheological damper is conducted on the vehicle vibration experimentation-bed to further study lateral semiactive suspensions using the skyhook and H_∞ control and results are compared and analyzed. It can be seen from the experimentation results that the overall control efficiency of the semiactive suspension is close to the best unactive suspension, while the semiactive suspension has a better efficiency in the resonance frequency spectrum. Results validate the reasonable experimentation process and the semiactive suspension's good function.