MR damper-based semiactive control system using electromagnetic induction device

2009 ◽  
Author(s):  
Hyung-Jo Jung ◽  
Dong-Doo Jang ◽  
Jeong-Hoi Koo
Keyword(s):  
Control System ◽  
Electromagnetic Induction ◽  
Mr Damper ◽  
Semiactive Control

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.

scholarly journals Effective Semiactive Base Isolation System under Multiple Earthquakes

2018 ◽  
Vol 2018 ◽  
pp. 1-12
Author(s):  
Mohtasham Mohebbi ◽  
Hamed Dadkhah
Keyword(s):  
Control System ◽  
Numerical Simulations ◽  
Base Isolation ◽  
Design Method ◽  
Mr Damper ◽  
Semiactive Control ◽  
Maximum Acceleration ◽  
Isolation System ◽  
Base Isolation System ◽  
Multiple Earthquakes

A method is proposed to design an effective semiactive control system composed of a linear low damping base isolation and a supplemental magnetorheological (MR) damper when the structure subjected to multiple earthquakes. In the proposed design method, the parameters of semiactive control system have been determined based on minimizing the average of maximum response of isolated structure under multiple design ground motions. To select appropriate value for force related weighting parameter, defined in performance index, a range has been suggested for each design objective. For numerical simulations, a scaled three-story base-isolated frame subjected to different scaled real earthquakes as well as filtered white noise excitations and the proposed method has been applied to design semiactive base isolation system under multiple earthquakes. The results of numerical simulations have shown the capability of the proposed method in designing an effective semiactive base isolation system, the performance of which under multiple earthquakes has been almost close to the case that it is designed optimally for each earthquake separately. Also, under multiple earthquakes, using the passive-off and passive-on forms of MR damper can be recommended, respectively, regarding to the objectives of minimizing the maximum acceleration and base drift.

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.

Semiactive Control System based on MR Damper for Suppressing Vibration of Stay Cable under Wind Load

2008 ◽  
Vol 41 (2) ◽  
pp. 15756-15761
Author(s):  
Hyung-Jo Jung ◽  
Dong-Doo Jang ◽  
Seung-Woo Lee ◽  
Heon-Jae Lee ◽  
In-Ho Kim
Keyword(s):  
Control System ◽  
Mr Damper ◽  
Wind Load ◽  
Semiactive Control ◽  
Stay Cable

Investigation of an energy harvesting MR damper in a vibration control system

2016 ◽  
Vol 25 (12) ◽  
pp. 125017 ◽  
Author(s):  
Bogdan Sapiński ◽  
Maciej Rosół ◽  
Marcin Węgrzynowski
Keyword(s):  
Control System ◽  
Energy Harvesting ◽  
Vibration Control ◽  
Mr Damper

Realization of desired damping characteristics based on an open-loop-controlled magnetorheological damper

2021 ◽  
pp. 107754632110388
Author(s):  
Hongwei Lu ◽  
Zhifei Zhang ◽  
Yansong He ◽  
Zhi Li ◽  
Jujiang Xie ◽  
...  
Keyword(s):  
Control System ◽  
Control Method ◽  
Characteristic Curve ◽  
Mr Damper ◽  
Open Loop ◽  
Low Noise ◽  
Magnetorheological Damper ◽  
Bench Test ◽  
Damping Force ◽  
Damping Characteristics

The realization of the desired damping characteristics based on magnetorheological (MR) dampers is important for semi-active control and useful for the matching process of suspension damper. To reduce the cost of the control system and improve the output accuracy of the desired damping force, this study proposes an open-loop control method featuring an accurate inverse model of the MR damper and a tripolar current driver. The reversible sigmoid model is used to accurately and quickly calculate the desired current. Furthermore, the change characteristic of the desired current is analyzed qualitatively and quantitatively, which shows that the desired current needs to change suddenly to make the actual damping force velocity curve quickly approach the desired one. To meet the demand of the desired current, a tripolar current driver controlled by an improved PI control algorithm is proposed, which is with fast response and low noise. Finally, the bench test verifies that the control system can achieve different desired damping characteristics well, and the inherent error in this process is explained through the gap between the available damping force area and the desired damping characteristic curve and the crossover phenomenon of the dynamic characteristic curves of the MR damper.

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