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Opened up a new world in the past three decades, the development of intelligent control for vibration control of civil engineering structures. Structure of intelligent control system to the application of smart materials and devices for prominent signs. The intelligent drive material can be used for the production of the control device main the electrical / magnetorheological fluid, shape memory material, a piezoelectric material, a magnetostrictive material, and can shrink expansion polymerization colloid. Using intelligent driver material can produce electricity, magnetism or temperature adjustable active control of the drive unit and the variable damping device, and large output, energy consumption, and a quick response, will become a new generation of active drive unit and variable damping structural vibration control device. Magnetorheological fluid (MR) damper is an excellent semi-active control devices. MR damper with its mechanical simplicity, wide tuning range, low energy consumption, large output, as well as stability caused widespread concern in the domestic and foreign experts and scholars. The study focused on our own research and development the 2T-MR damper. First, summarize and review the experts and scholars at home and abroad in recent years, studies and applications of MR damper, and put forward the work to be carried out on its basis; Second, MR liquid rheological mechanism, constitutive relations, and preparation requirements etc., by comparing the previously developed MR dampers, more reasonable type of damper and internal structure, on this basis, the use of MR damper plate model for the preliminary design of the MR damper. MR liquid gap of two important indicators of the dampers and damper: damping force size and power adjustable range in the design process, and get the most optimized gap. The preliminary design of the magnetic circuit design, design of accumulator. Again, for the 2T-MR damper developed a quasi-static test, and describes the different current input, in response to the test results of the time based on the amplitude, based on the frequency, the damper, and the test results are compared with the theoretical results, the theoretical results yield shear stress and the relationship between the current calculated by the plate model to predict the MR fluid, while some phenomena appear in the test carried out, given the possible causes of these phenomena occur. Due to the quasi-static model, such as flat-panel model can not be a realistic simulation of the dynamic characteristics of the MR damper, in the fourth chapter focuses about the types of dynamic model, discussed the impact of the parameters of the model, damped least squares method to identify and use according to the test results the parameters of the model. Finally, the use of finite element analysis of electromagnetic field simulation software that magnetic circuit part of the core part of the 2T-MR damper, the magnetic field distribution of the different current damper, magnetic saturation and magnetic leakage condition, MR fluid pore the magnetic flux density, finite element analysis, which optimize the design of the magnetic circuit of the damper, the damper designed to achieve the best efficiency. The purpose of this study is to in-depth study of the dynamic characteristics of the MR damper optimal design method of MR damper dynamic model parameter identification method with magnetic circuit, and lay the foundation for the design of a more excellent MR damper.
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