This article aims at designing a magnetorheological (MR) fluid damper that is suitable for a semi-active train suspension system in order to improve its ride quality. A double-ended MR damper is designed, fabricated, and tested. Simulation is carried out by integrating the MR damper model in the secondary suspension of a full-scale railway vehicle model. The feasibility and effectiveness of the semi-active train suspension system with the developed MR dampers are investigated by comparing the controlled performances of the MR suspension system with different passive suspension systems. The results show that the semi-active suspension with the developed MR dampers can substantially improve the ride quality of the passengers.
The development of high-speed railway vehicles has been a great interest of many countries because high-speed trains have been proven as an efficient and economical transportation means while minimizing air pollution. However, the high speed of the train would cause significant car body vibrations. Thus effective vibration control of the car body is needed to improve the ride comfort and safety of the railway vehicle. Various kinds of railway vehicle suspensions such as passive, active, and semi-active systems could be used to cushion passengers from vibrations. Among them, semi-active suspensions are believed to achieve high performance while maintaining system stable and fail-safe. In this paper, it is aimed to design a magnetorheological (MR) fluid damper, which is suitable for semi-active train suspension system in order to improve the ride quality. A double-ended MR damper is designed, fabricated, and tested. Then a model for the double-ended MR damper is integrated in the secondary suspension of a full-scale railway vehicle model. A semi-active on-off control strategy based on the absolute velocity measurement of the car body is adopted. The controlled performances are compared with other types of suspension systems. The results show the feasibility and effectiveness of the semi-active train suspension system with the developed MR dampers.
The objective of this paper is to develop a pressurized magnetorheological (MR) damper which is suitable for train suspension in order to improve the ride comfort of passengers. A double-ended MR damper is designed and fabricated. The custom-made MR damper is pressurized in order to eliminate the force-lag problem. Then the MR damper is mathematically modeled with experimental validation and then integrated with the railway vehicle model. An on-off semi-active control strategy based on the measurement of the absolute lateral velocity of the car body is adopted for the semi-active suspension system. The performances of the semi-active train suspension system using MR dampers are evaluated by comparing with the passive, passive-on-H and passive-on-L suspension systems. The results indicate that when the human sensation of ride comfort is considered, the semi-active suspension with the developed MR dampers can substantially improve the ride quality of the passengers.
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