A vehicle suspension system performs two functions, the ride quality and the stability, which conflict with each other. Among the various suspension systems, an active suspension system has an external energy source, from which energy is always supplied to the system for continuous control of vehicle motion. In the process of the linearization for the nonlinear active suspension system, the frequency dependent damping method is used for the exact modelling to the real model. The pressure control valve which is controlled by proportional solenoid is the most important component in the active suspension system. The pressure control valve has the dynamic characteristics with 1st order delay. Therefore, It's necessary to adopt the lead compensator to compensate the dynamics of the pressure control valve. The sampling time is also important factor for the control performances. The sampling time value is proposed to satisfy the system performances. After the modelling and simulation for the pressure control valve and vehicle dynamic, the performances of the vehicle ride quality and the stability are enhanced.

Abstract
 1. 서론
 2. 시스템 모델링
  2.1 압력제어밸브의 모델링
  2.2 작동기(Actuator) 모델링
  2.3 주파수 감응감쇠에 의한 차량 모델링
 3. 시뮬레이션 결과 및 고찰
  3.1 주파수 감응감쇠 특성
  3.2 앞섬 보상기의 성능
  3.3 샘플링 시간의 영향
 4. 결론
 참고문헌

• 김주용(우송대학교 철도차량시스템학과) | J. Y. KIM