| Magnetorheological (MR) fluid is a kind of smart material, its apparent viscosity and shear yield stress can change quickly with the transformation of externally applied magnetic field. So, the MR fluid can be used as controllable damping medium, mainly in form of real-time controllable dampers. The Magnetorheological damper (MRD) which is a new kind of devices for semi-active control, only needs less power to keep the control systems running and provides a good kind of control device for structural vibration control. To control structural vibration effectively, the semi-active intelligent control technology of structural vibration has been studied by using the MRD in this thesis.At the beginning of the thesis an introduction of previous research on MR fluid and the mechanics characteristics of MR fluid is given. Following based on the analyses of MR damper work characteristics, a dynamics model of vibration system that is similar with the vehicle suspension system is set up, and the theories and advantages of sky-hook control algorithm and a fuzzy control algorithm are discussed. The dynamics functions are given and the model is simulated and calculated by the software MATLAB and its toolboxes. According to the simulation results, the effect of vibration-control system is proved.Then an experiment is done by using self-made vibration-control system and MR damper. A TMS320F2812 DSP made by TI is used to sample signal and output control signal, and On-Off algorithm and fuzzy algorithm is used in the control program. Finally a satisfied result is obtained. By analyzing the result, the feasibility of the vibration-control system and the algorithms is proved. |
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