A proposal of a nonlinear H∞ control method for a semiactive damper with a magnetic fluid base

This paper deals with a novel type of semiactive damper which is composed of a cylinder injected with a magnetic rheological fluid (MRF) and an electromagnet with a nonlinear H^∞ controller. It is generally known that the viscosity of an MRF depends on the magnitude of the magnetic field. Therefore, this paper aims at controlling the damping property of a mechanical system by changing the magnitude of the magnetic field. In this study, the novel semiactive damper system is modeled precisely, a design method of the H^∞ nonlinear controller is proposed and finally various advantages of the proposed damper system are confirmed by digital simulation