CONTROL STRATEGY FOR IMPROVING RIDE COMFORT IN RAILWAY VEHICLE BY MR DAMPER

초록

Recently the maximum speed becomes the most important performance in high speed train. But the speed up of train will not give the passenger good riding comfort. The semi-active suspen-sion system by using variable damper with hydraulic solenoid valve is used to solve this problem. But the variable damper with hydraulic solenoid valve requires tank for supplying fluid. In this study, the MR(Magneto Rheological) damper was considered instead of hydraulic variable damper in order to improve riding comfort. 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. Dynamic simulation was conducted for semi-active suspension system with MR damper was made by using Matlab-Simulink S/W. Finally, according to control strategy of MR damper for improving ride comfort in railway vehicle, The riding comfort of the railway vehicle with semi-active suspension system was analyzed and compared with conventional suspension system by using the program.