Semi-active secondary suspension for improving ride comfort by using MR damper

초록

The maximum speed is one of the most important performance in high speed train. But as the train speed is higher, the riding comfort becomes worse. Therefore it will need better track condition and the maintenance cost will be higher. The semi-active and active suspension system has introduced to solve this problem. Especially, the semi-active suspension system is cheaper than the active one, and the performance is satisfactory. The dynamic equations on full model of railway vehicle in lateral direction were built. The MR damper was used instead of lateral damper in secondary suspension. Before studying the semi-active suspension by using MR damper, the limit speed of railway vehicle was reviewed because the running stability of railway vehicle in tangent track must be guaranteed. The limit speed was analyzed according to the variation of secondary suspension characteristics and wheel tread conicity. The dynamic simulation was conducted for semi-active suspension system with MR damper. According to the skyhook control by using MR damper, the riding comfort of the railway vehicle with semi-active suspension system was analyzed and compared with conventional suspension system by using the program. Finally, the experimental results of improving riding comfort was presented by using 1/5 scaled mockup of railway vehicle.