Research Of Two-way Pusher-over Bar MRF Absorber And Damping System

The Magnetorheological fluid (MRF) absorber is a kind of novel intelligent material device. Compared with common liquid absorber it has a lot of advantages, such as simple structure, low power requirements, wide dynamic ranges and fast reaction. The MRF absorber is a typical controllable fluid absorber, which is the most effectively intelligence setting to carry out active or the half control of the engineering vibration. The MRF absorber has a vastly prospect in the field of automobile, aircraft and bridge etc.In this thesis, based upon the machinery design principle , electrical engineering theory and electromagnetic field theory, a model of shear and valve type MRF damper with two-way pusher-over bar and taking the spring as a component of bearing weight is designed and manufactured at first. The MRF absorber has a lot of advantages. For example, the magnetic density can be fully used, the leading and seal of the loop is easy and the damper can be used as the common hydraulic damper while there is no magnetic field.After the theory and the experimental results have been analysed , fine shock absorption effect and range of adjustable damp forces were gained. Judging from reducing vibration,the absorber has a better effect than one type absorber used on market. In static state effect aspect, the damp increase four times when electric current is changed. The Characteristics of the MRF absorber is very valuable in actual application aspect.And then, theoretical analysis and experimental modeling of multi-ring grooves structure MR fluid damper have been made in this thesis. Based upon MR fluid dynamics and electromagnetics theory and Bingham model of No-Newton fluid, a viscosity model is presented in the thesis. The correctness of dynamic model is verified by contrasting the simulation data and the experiment data, which provided a reference for forecast and controlling the capability of the absorber. Finally, according to results simulated by the labview software, it is indicated that changing electric current can be carried out optimal control on magnetism flowing deformation shock absorber.