A design and bench test of multi-modal active suspension of railway vehicle

An active suspension system of railway vehicle is discussed. This system copes with three modes (vertical, lateral, rolling) of carbody vibrations. The vehicle dynamics is modeled as a 7-degree of freedom model which includes the characteristic effect of lateral force and yawing moment of railway vehicle. In this study, a pneumatic control system and a hydraulic control system are implemented. The control valve of pneumatic system is configured with a PWM solenoid valve set which contributes cutting delay time. The hydraulic system is configured with a flow rate control valve and accumulators which give compliance to the system. Then control systems are submitted to bench tests on the rolling stock test plant. The results show that each vibration mode of carbody is reduced to 1/2~1/3. Mutual interactions of vibration modes are also reduced