MODELLING AND CONTROL OF MAGNETORHEOLOGICAL SHOCK ABSORBER UNDER IMPACT LOAD

摘要

The application of Magnetorheological (MR) shock absorber under impact and impulsive load is of great value for vibration reduction. However, when the loads are impulsive, little dynamic model can be used to describe the dynamic behavior of the MR shock absorber. Few researches have been focused on the control of MR shock absorber under impact load. In this paper, a novel MR shock absorber for impulsive load was exhibited and the model of this shock absorber was developed for its use under impulsive load. Inertia damping force and throttle damping force, which is caused by abrupt acceleration and high flow velocity of MR fluids, was introduced to describe the dynamic performance of MR shock absorber. This model can easily explain the reason of the uncontrollable region. Six control algorithms were compared for its implement to control the dynamic behavior of MR shock absorber under impact and impulsive load. It is shown that the optimal control is the better control algorithm because of its effective and smooth change of the current.