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

本文研究了一种新型半主动阻尼器，该阻尼器由注入磁流变液的圆柱体和带有非线性H^*控制器的电磁铁组成。众所周知，磁流变液的粘度可以随磁场的大小而改变。因此，本研究旨在构建这样一个充分利用该特性的半主动阻尼系统。1996年，提出了新型半主动阻尼器的理论模型。其次，针对半主动阻尼器系统具有较强的非线性特性，给出了该类阻尼器的H型非线性控制器的设计方法。仅通过数字仿真就证实了该半主动阻尼器的一些优点。1997年，研制了一种注入某种磁流变液的半主动阻尼器，并对其基本性能进行了测试。结果表明，磁流变特性具有适合控制的动态范围。此外，还实际安装了合适的磁流变半主动阻尼器的非线性补偿器，并进行了振动实验，以捕捉其基本特性。1998年，根据大量振动实验结果，对设计补偿器的理论模型进行了修改，使其更符合实际装置的特性。最后，通过大量的振动实验和数字仿真验证了该方法的优越性。

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.