MR damper-based smart passive control system for seismic protection of building structures

2006 ◽  
Author(s):  
Hyung-Jo Jung ◽  
Kang-Min Choi ◽  
Ji-Eun Jang ◽  
Sang-Won Cho ◽  
In-Won Lee
Keyword(s):  
Control System ◽  
Passive Control ◽  
Mr Damper ◽  
Seismic Protection ◽  
Building Structures

Experimental Investigation of Effectiveness of Smart Passive System for Seismic Protection of Building Structures

2008 ◽  
Vol 56 ◽  
pp. 355-362
Author(s):  
Hyung Jo Jung ◽  
Dong Doo Jang ◽  
Heon Jae Lee ◽  
Seok Jun Moon
Keyword(s):  
Electromagnetic Induction ◽  
Mr Damper ◽  
Shaking Table ◽  
Frame Structure ◽  
Seismic Protection ◽  
Semiactive Control ◽  
Building Structures ◽  
Passive System ◽  
Engineering Structures ◽  
Faraday’S Law

The newly developed smart passive system is based on a magnetorheological fluid (MR) damper, which is one of the most promising semiacitve control devices, and an electromagnetic induction (EMI) part, which is a power harvesting device from vibration of a structure according to Faraday’s law of electromagnetic induction. Numerical simulations recently conducted by the authors have verified that the smart passive system could be effective to reduce the structural responses in the cases of civil engineering structures such as buildings and bridges. On the other hand, the experimental validation of the system is not sufficiently carried out yet. In this study, therefore, a series of shaking table tests are conducted to experimentally investigate the effectiveness of the smart passive system for seismic protection of building structure. The model structure is a scaled six-story frame structure with the height of 3.5 m and the weight of about 8 ton. The smart passive system is installed between its base floor and the first floor. The responses of the structure are measured under several ground motions including scaled historic earthquake records. The preliminarily experimental results in the smart passive system case are compared with those in the MR damper-based semiactive control cases.

Passive control system for seismic protection of a multi-tower cable-stayed bridge

2014 ◽  
Vol 6 (5) ◽  
pp. 495-514 ◽  
Author(s):  
Fangfang Geng ◽  
Youliang Ding ◽  
Jianyong Song ◽  
Wanheng Li ◽  
Aiqun Li
Keyword(s):  
Control System ◽  
Passive Control ◽  
Seismic Protection ◽  
Cable Stayed Bridge

Seismic protection of base isolated structures using smart passive control system

2007 ◽  
Vol 3 (3) ◽  
pp. 385-403 ◽  
Author(s):  
Hyung-Jo Jung ◽  
Kang-Min Choi ◽  
Kyu-Sik Park ◽  
Sang-Won Cho
Keyword(s):  
Control System ◽  
Passive Control ◽  
Seismic Protection ◽  
Isolated Structures

Smart Damping System Based on MR Damper and Electromagnetic Induction Device for Suppressing Vibration of Stay Cable

2009 ◽  
Author(s):  
In-Ho Kim ◽  
Dong-Doo Jang ◽  
Hyung-Jo Jung ◽  
Jeong-Hoi Koo
Keyword(s):  
Control System ◽  
Electromagnetic Induction ◽  
Passive Control ◽  
Mechanical Energy ◽  
Mr Damper ◽  
Electrical Energy ◽  
Induced Voltage ◽  
Stay Cable ◽  
Power Sources ◽  
Cable Vibrations

This paper investigates the effectiveness of a smart damping system consisting of a magnetorheological (MR) damper and an electromagnetic induction (EMI) device in reducing cable vibrations. The smart damping system incorporates an EMI device to reduce complexity of conventional MR damper based semi-active control system by eliminating external power sources. This is because the EMI part in the system generates electrical energy (i.e., induced voltage) from mechanical energy (i.e., reciprocal motions of an MR damper), which can be used as a power source for the MR damper. The primary goal of this experimental study is to evaluate the performance of the proposed smart damping system using a full-scale, 44.7 meters long, high-tension cable. To this end, free vibration responses and damping of the proposed smart damping system were compared with those of an equivalent passive control system. The experimental results show that the smart damping system shows better control performance than all the passive control cases.

On the Efficacy of Magnetorheological Dampers for Seismic Response Reduction

1997 ◽  
Author(s):  
S. J. Dyke ◽  
B. F. Spencer ◽  
M. K. Sain ◽  
J. D. Carlson
Keyword(s):  
Control Systems ◽  
Structural Response ◽  
Mr Damper ◽  
Seismic Protection ◽  
Seismic Excitations ◽  
One Dimensional ◽  
Mr Dampers ◽  
Earthquake Motion ◽  
Intrinsic Nonlinearity ◽  
Series Of Experiments

Abstract In this paper, the efficacy of magnetorheological (MR) dampers for seismic protection of structures is investigated through a series of experiments in which an MR damper is used to control a three story test structure subjected to a one-dimensional earthquake motion. Because of the intrinsic nonlinearity of the MR damper, several earthquake amplitudes are considered to investigate the performance, in terms of both peak and rms responses, of this control systems over a range of loading conditions. The results indicate that the MR damper is quite effective for structural response reduction over a wide class of seismic excitations.

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