Sliding Mode Semi-Active Base Isolation Using the Switching Hyperplane Designed by Disturbance-Accommodating Bilinear Control.

Abstract

In vibration isolation control problem, semi-active control methods in which coefficient of viscous damping is varied effectively have been proposed and expected to realize a high performance. However, the semi-active system is classified into a bilinear system which belongs to a nonlinear system. In this study, the switching hyperplane of sliding mode control is designed by the disturbance-accommodating bilinear optimal control theory and it is applied to a semi-active vibration base isolation problem. The proposed method adopts the damping force in criteria function, and the controller takes into account the disturbance dynamics by difining an augemented bilinear system. This study deals with a ten-degree-of-freedom structural model with base isolation. And the computer simulation is carried out by taking account of the delay of switching the coefficient of dampers. As a result, the usefulness of the present method was demonstrated.