This paper presents performance analysis of semi-active railway vehicle suspension system using MR damper. In order to achieve this goal, a mathematical dynamic model of railway vehicle is derived by integrating car body, bogie frame and wheel-set which can be able to represent lateral, yaw and roll motion. Based on this model, the dynamic range of MR damper at the railway secondary suspension system and design parameters of MR damper are calculated. Subsequently, control performances of railway vehicle including car body lateral motion and acceleration of MR damper are evaluated through computer simulations. Then, the MR damper is manufactured to be retrofitted with the real railway vehicle and its characteristics are experimentally measured. Experimental performance of MR damper is assessed using test rig which is composed of a car body and two bogies.
In urban transit systems, railway vehicles are often required to negotiate tight curves. During curve negotiation, the
wheelsets of conventional vehicles generally misalign radically with the track increasing wheel/rail contact forces and
resulting in increased wheel and rail wear, outbreak of squeal noise, fuel consumption, and risk of derailment. This paper
presents active steering controller design in the railway systems using Linear Quadratic Gaussian. Simulation results
have been shown that the proposed LQG method methodology robustly yields uniform performance with adequate
response over the axle weight and wheel conicity variation range.