標題: Fuzzy logic control of a stiffness-adaptable seismic isolation system
作者: Lin, Tzu-Kang
Lu, Lyan-Ywan
Chang, Hsun
土木工程學系
Department of Civil Engineering
關鍵字: semi-active isolation;fuzzy logic control;shaking table test;adaptable stiffness;near-fault earthquake;leverage mechanism
公開日期: 1-Jan-2015
摘要: Traditional passive isolation systems have been shown to provide satisfactory seismic mitigation performance under typical far-field earthquake conditions. However, because of the untunable designated isolation period, the performance of these systems is still strongly affected by the low-frequency resonance phenomenon observed during near-fault earthquakes, which are usually dominated by a long-duration impulse. The use of semi-active isolation systems with variable stiffness, which are usually equipped with a customized control algorithm to determine the isolation stiffness or period in real time, could be a promising solution to overcome this problem. To realize this technology, this study develops a smart isolation system that combines the leverage-type stiffness-controllable isolation system (LSCIS) with a simple fuzzy logic control (FLC). Because the proposed FLC merely requires feedback from the velocity and displacement responses of the isolation base, it is quite easily implemented. Theoretical analysis shows that the extreme displacement of the isolation level caused by near-fault seismic waves can be mitigated by the proposed system with tolerable acceleration response variations compared with that of the traditional passive isolation system. The movement of the pivot point of the LSCIS can also be adjusted to address the inherent hardware constraint that limits its practical application. Experimental verification conducted on a shake table further demonstrates the feasibility of integrating the LSCIS system with FLC after proper consideration of the friction effect generated by the leverage mechanism and the inevitable time delay effect. Copyright (c) 2014 John Wiley & Sons, Ltd.
URI: http://dx.doi.org/10.1002/stc.1667
http://hdl.handle.net/11536/124059
ISSN: 1545-2255
DOI: 10.1002/stc.1667
期刊: STRUCTURAL CONTROL & HEALTH MONITORING
Volume: 22
起始頁: 177
結束頁: 195
Appears in Collections:Articles