Title: Semi-active base isolation for a building structure

Authors: Kazuo Yoshida, Tadahiro Fujio

Addresses: Department of System Design Engineering, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan. Graduate School, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan

Abstract: Recently semi-active control methods have been proposed and received much attention. In semi-active base isolation, the coefficient of viscous damping or the spring constant is changed effectively according to the state of the control object. The system using a semi-active damper is classified as a bilinear system which belongs to non-linear systems. In this paper, optimal control theory is applied to a bilinear system using feedforward information of disturbance, and the bilinear optimal control law is derived. Then the method is applied to an actual building which is modelled by a 10 degree-of-freedom structure model with base isolation using a semi-active oil damper. The numerical analysis shows that the method has high control performance in a wide frequency range, and it is effective for the vibration base isolation of building structures.

Keywords: base isolation; building structure; semi-active control; optimal control; bilinear control.

DOI: 10.1504/IJCAT.2000.000223

International Journal of Computer Applications in Technology, 2000 Vol.13 No.1/2, pp.52-58

Published online: 13 Jul 2003 *

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