Study On Dynamic Characteristics And Control Of Electrorheological Damper Under Impact Load

The impact load is widespread in the engineering applications, and the problems induced by vibration and shock that most of the large machines faced become more and more severe, which is easy to cause vibration and destruction and reduce the service life of equipments. Thus solving the vibration of devices under impact load is particularly important. Electrorheological(ER) fluid, its viscosity changes when applied the high voltage, is a new kind of smart material, and it can change between the solid-liquid two phase instantly. Using the controllable characteristic of the ER fluid, ER damper is designed with simple structure, controllable damping force and excellent mechanical and electrical coupling characteristics. Combined with the concerned control theory, the vibration can be effectively controlled and reduced.As to the ER damper is applied as the shock absorber under the impact load, the following researches are done in this dissertation:(1) Based on the analysis of damper force under the impact load, the mechanical formula based on Bingham model was derived. The simulation model of ER damper under multi-physical fields was established, and coupling simulation analysis was carried on by using of COMSOL Multiphysics. The feasibility of ER damper that works under the impact load was verified by the simulation results.(2)The nonlinearity, stability and controllability of the ER damper buffer system were analyzed and verified; the platform effect was put forward as the control target of system. The control model of the ER damper buffer system based on Simulink was established, which the core of model is fixed voltage control, PID control and fuzzy control respectively, and the algorithms were simulated.(3) The impact test platform based on dSAPCE semi-physical simulation system was set up, which test platform is used to simulate the impact load. To realize the Rapid Control Prototyping of the buffer system, fixed voltage control, PID control and fuzzy control are adopted respectively. And the buffer damping effect of the ER damper was studied. The test results show that the fuzzy control algorithm has the best control effect, which are consistent with the simulation results.