New Type Of Magnetorheological Damper Under Impact Load Control System Design And Implementation

The impact load is widespread in the engineering applications, and most of the large machines are developed toward high-speed and heavy-load, so the shock and vibration problems its faced become more severe. Due to impact load with short action time and large force, it is easy to cause destruction for engineering equipment. So to solve the problem of vibration under impact load is particularly important. Magnetorheological fluid is a versatile and smart material with excellent quality. Magnetorheological Damper, an intelligent buffer cushioning device with simple structure, low power consumption and controllable damping force characteristics, which is made use of the controllable characteristic of the magnetorheological fluid. By combining with the control theory, the vibration can be effectively controlled.As to the MR damper worked under the impact load, the following research is done in this paper:(1) The structure of MR damper was introduced, the damper force was analyzed when it worked, the mechanical formula was derived, and the influence from effective length, the annular gap and the other structural parameters to damping force was discussed. The MR damper’s electromagnetic model was built based on the B-H and B-ty curve, combined with the structural and material parameters of the damper.(2)The nonlinearity, stability and controllability of the MR damper buffer system were analyzed; the platform effect of the displacement and damping force was raised as the control target. Fixed current control, PID control and fuzzy control were designed based on the characteristics of MR damper buffer system worked under the impact load. The three control algorithms were verified through simulation and the simulation data was analyzed.(3) An integrated control system was designed, including the hardware and the software. By using of test platform to simulate the impact load, the buffer damping effect of the new MR damper was studied under fixed current control, PID control and fuzzy control. The test results show that the fuzzy control method has the best buffer damping effect.