Comprehensive Study on Controllability of a Large-Scale MR Shock Absorber Under High Impact Load

Abstract

The primary purpose of this study is to provide a comprehensive understanding on the controllability of a large-scale single-ended Magnetorheological (MR) shock absorber under impact load. Performances of MR shock absorber under random load, mainly in the transportation applications, seismic protection in civil engineering and wind-rain-induced load in Cable Bridge, are well investigated by many researchers. However, little research has been focused on the dynamic performance of MR shock absorber under impact load. Furthermore, the controllability of large-scale MR shock absorber under impact load is not researched in detail. In this paper, a test rig which uses a closed bump to produce an impact load is developed. A novel large-scale single-ended MR shock absorber without the accumulator is used as the specimen. To evaluate the controllability of MR shock absorber under impact load, several different currents are applied to the MR shock absorber. Moreover, an on-off control strategy is applied to the electromagnetic coil to investigate the dynamics of this shock absorber under impact load. It is indicated that this large-scale single-ended MR shock absorber has a good controllability compared with small double-ended MR shock absorber.