Study On Semi-Active Control Of MR Fluid Absorber Vibration Reduction System

The Magnetorheological (MR) fluid absorber has advantages of safe, low power, wide dynamic ranges and fast reaction. It is a typical controllable fluid absorber. It is suitable for vibration reduction of structures and vehicle suspension system. Semi-active control is often used in vibration reduction. There are some advantages in semi-active control, without energy source,easy going, etc. Semi-active vibration reduction is in effect by changing the damp coefficient of MR fluid absorber in vibration reduction system. The vibration characteristic and the semi-active control method of MR fluid Absorber were discussed in this paper.The vibration characteristic of multi-ring grooves structure MR fluid absorber have been constructed in this paper. The vibration mechanics model of the absorber is established. The forced oscillation analyzes is carried on under simple harmonics drives。The transmittance curve of system vibration characteristic is obtained. By the vibration test-bed the absorber's vibration characteristic is experimented.,and the absorber design is proved to be rational。Under the Union theoretical analysis, The absorber design parameters is optimized。Then control algorithm is designed by using fuzzy control theory. The actuation electric circuit of exciting coil is designed by using the switching power supply theory. Using the vibration test-bed ,the vibration characteristic of passive control absorber is compared with the vibration characteristic of semi-active control. It is indicated that semi-active vibration reduction based on fuzzy control has an advantage over passive control. Semi-active control based on fussy control takes an effective performance in MR fluid absorber vibration reduction system. .