scholarly journals Fuzzy Control of Smart Base Isolation System using Genetic Algorithm

2005 ◽  
Vol 9 (2) ◽  
pp. 37-46
Keyword(s):  
Genetic Algorithm ◽  
Fuzzy Control ◽  
Base Isolation ◽  
Isolation System ◽  
Base Isolation System ◽  
Smart Base Isolation

A genetic algorithm–based design approach for smart base isolation systems

2017 ◽  
Vol 29 (7) ◽  
pp. 1315-1332 ◽  
Author(s):  
Mohtasham Mohebbi ◽  
Hamed Dadkhah ◽  
Hamed Rasouli Dabbagh
Keyword(s):  
Genetic Algorithm ◽  
Optimization Problem ◽  
Base Isolation ◽  
Design Procedure ◽  
Design Parameters ◽  
Linear Quadratic ◽  
Isolation System ◽  
Isolation Systems ◽  
Magneto Rheological ◽  
Smart Base Isolation

This article presents a new approach for designing effective smart base isolation systems composed of a low-damping linear base isolation and a semi-active magneto-rheological damper. The method is based on transforming the design procedure of the hybrid base isolation system into a constrained optimization problem. The magneto-rheological damper command voltages have been determined using H2/linear quadratic Gaussian and clipped-optimal control algorithms. Through a sensitivity analysis to identify the effective design parameters, base isolation and control algorithm parameters have been taken as design variables and optimally determined using genetic algorithm. To restrict increases in floor accelerations, the objective function of the optimization problem has been defined as minimizing the maximum base drift while putting specific constraint on the acceleration response. For illustration, the proposed method has been applied to design a semi-active hybrid isolation system for a four-story shear building under earthquake excitation. The results of numerical simulations show the effectiveness, simplicity, and capability of the proposed method. Furthermore, it has been shown that using the proposed method, the acceleration of the isolated structure can also be incorporated into design process and practically controlled with a slight sacrifice of control effectiveness in reducing the base drift.

Design of Shape Memory Alloy Damper for Base Isolated Structure

1997 ◽  
Author(s):  
Krzysztof Wilde ◽  
Paolo Gardoni ◽  
Yozo Fujino ◽  
Stefano Besseghini
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Base Isolation ◽  
Hysteretic Behavior ◽  
Isolation System ◽  
Rubber Bearing ◽  
Laminated Rubber Bearing ◽  
Base Isolation System ◽  
Rubber Bearings ◽  
Smart Base Isolation

Abstract Base isolation provides a very effective passive method of protecting the structure from the hazards of earthquakes. The proposed isolation system combines the laminated rubber bearing with the device made of shape memory alloy (SMA). The smart base isolation uses hysteretic behavior of SMA to increase the structural damping of the structure and utilizes the different responses of the SMA at different levels of strain to control the displacements of the base isolation system at various excitation levels. The performance of the smart base isolation is compared with the performance of isolation by laminated rubber bearings to assess the benefits of additional SMA damper for isolation of three story building.

Real-time hybrid testing of a smart base isolation system

2013 ◽  
Vol 43 (1) ◽  
pp. 139-158 ◽  
Author(s):  
Pei-Ching Chen ◽  
Keh-Chyuan Tsai ◽  
Pei-Yang Lin
Keyword(s):  
Real Time ◽  
Base Isolation ◽  
Hybrid Testing ◽  
Isolation System ◽  
Base Isolation System ◽  
Smart Base Isolation

Dynamic Performance Analysis of a Smart Base Isolation System Based on Magnetorheological Elastomers

2013 ◽  
Vol 397-400 ◽  
pp. 422-426
Author(s):  
Zhi Qiao ◽  
Jian Guo Ding
Keyword(s):  
Elastic Modulus ◽  
Smart Materials ◽  
Base Isolation ◽  
Dynamic Performance ◽  
Isolation System ◽  
Magnetorheological Elastomers ◽  
Dynamic Loadings ◽  
Base Isolation System ◽  
Dynamic Performance Analysis ◽  
Smart Base Isolation

In this paper, we studied a smart base isolation system based on magnetorheological elastomers (MRE), which is a new class of smart materials whose elastic modulus or stiffness can be adjusted by changing the magnitude of the applied magnetic field. The main goals of this study are to demonstrate the use of MREs as field-dependent element in a smart base isolation system and investigate the dynamic performance of the smart base isolation system in mitigating excessive vibrations of the building structure under dynamic loadings. To this end, we designed some MRE samples working in compressive mode and measured their properties under various magnetic fields in which the elastic modulus varied by up to 250%.Compared with the structure installing traditional base isolation system, the dynamic performance of the structure installing smart base isolation system is much better under the dynamic loadings.

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