With the new advancements in the vibration control, the control strategies for the controllableudsemi-active dampers are finding their way as an essential part of vibration isolators,udparticularly in vehicle suspension systems. An analysis of frequency response for single degreeudof freedom (1DOF) system gives an attribute to the fact that in a semi-active suspensionudsystem, the damping coefficients can be adjusted to improve ride comfort and road handlingudperformances.udThe systems study includes various type of semi-active suspension systems, employingudnonlinear magnetorheological(MR) dampers that are controlled to provide improved vibrationudisolation. The currently available control strategies for semi-active dampers can beuddivided into two main groups. The first one is `On-Off' control and second one is `continuous'udcontrol of variable dampers. Available control strategies are either proportional to theudrelative velocity of sprung mass or the acceleration of sprung mass. A new control strategyudwhich is proportional to the jerk produced in sprung mass called Jerk Driven Damper (JDD)udis proposed and analyzed by the use of two state 'On-Off' damper. The control strategy forud'JDD' system is extremely simple and it involves very common logic. `JDD' system requiresuda two state controllable damper and jerk sensor. A brief study on controllable damper andudjerk sensors are presented in this thesis.
展开▼
