The Effectiveness Of Active Front Bumper System For Frontal Impact Protection Using Magnetorheological

This research introduces a non-parametric modeling of a magnetorheological (MR) damper under impact its uses as a frontal impact protection device in active front bumper system. The research is started with the development of vehicle crash model for the impact testing. The concept of vehicle crash model including with the equation of motion such as impulse and momentum equation is derived. This study is aimed to model the behavior of a magnetorheological (MR) damper under impact loading through polynomial approach. The polynomial model is developed based on curve fitting from experimental results which consists of three regions namely fluid locking, positive and negative acceleration regions. The experimental results obtained from the impact test apparatus are evaluated in the form of transmitted force in time, velocity and di placement domains. The simulation results of the proposed polynomial model are then validated with the experimental results. The validated model is used to develop an inner loop controller by implementing a close-loop PI control to track the desired damping force through simulation. The governing equations of motions of vehicle collision and MR damper model are then integrated with the well known control strategy namely skyhook control. The performance of sk-yhook control is then compared with the vehicle with passive damper and common vehicle by using computer simulation in order to reduce the acceleration and the jerk of the vehicle during collision. As the result the skyhook control is significant to reduce the vehicle acceleration more than 20% and the jerking up to 40% compared with common vehicle