Basic study of M.R.F.active-damper by controlling a magnetic field of an electro magnet

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This study deals with a novel type of semiactive damper, which is composed of a cylinder injected with Magnetic Rheological Fluid(M.R.F.) and an electromagnet with a nonlinear H^* controller.It is generally known that the viscosity of M.R.F.can be changed by the magnitude of a magnetic field. Therefore, this study aims at constructing such a semiactive damper system that makes good use of the property.In 1996, a theoretical model of the novel semiactive damper was proposed. Next, a designing method of the H nonlinear controller for this type of damper was shown because the semiactive damper system has strong nonlinearity. Some advantages of the proposed semiactive damper were confirmed only by digital simulations.In 1997, a semiactive damper injected with a certain kind of M.R.F.was made and its basic properties were measured. As the results, it was shown the vscosity of the M.R.F.has the dynamic range which is suitable for control. In addition, a proper nonlinear compensator for the M.R.F.semiactive damper was actually installed and some vibration experiments were carried in order to catch basic caracteristics.In 1998, the theoretical model for designing compensators was altered so as to fit more for the characteristics of the actual device refering the results of many vibration experiments. Finally, the superiority was certified by many vibration experiments and digital simulations.