Structural Design. Magnetorheological Shock Buffer And Fuzzy Control

In many machinery and construction systems, the high impact load widely exists. Because of the short time and huge force, the impact load can easily bring the equipments and constructions to vibrate, fatigue, even invalidation. Due to the characters of low power requirement, rapid-response and large force, the MR damper have shown to be one kind of ideal impact absorber. In this dissertation, MR damper is applied as the shock absorber under impact load. And to have good performance in this application, not only the structure and parameters of MR damper piston but also the control algorithm are researched.Firstly, the model of MR damper is developed based on the Bingham and the Herschel-Bulkley model of the MR fluid, individually. And with the Bingham model, a series of long-scale MR dampers are designed to apply in the impact mitigation.Secondly, the MR damper model is simulated in the Simulink both with constant control current and different control algorithms to confirm the practicability of the application of MR damper under impact load. These control algorithms include PI control, fuzzy control, fuzzy-PI control and variable universe fuzzy control. The effect of these control algorithms are compared. Meanwhile, the influence of system delay and uncertainty to different algorithm are analyzed."Finally, considering some problems in the results of control simulation, the influences of the structure parameters to the control effect are researched, and two points are emphasized and added to the process of structure design.