scholarly journals SHAKING TABLE TEST OF SEMI-ACTIVE CONTROL FOR BASE-ISOLATION SYSTEM BY MR-DAMPER APPLIED WITH OPTIMAL REGULATOR THEORY : Effect of changing weighting matrix

2007 ◽  
Vol 72 (618) ◽  
pp. 73-79 ◽  
Author(s):  
Hideki FUJII ◽  
Takeshi HIWATASHI ◽  
Hideo FUJITANI
Keyword(s):  
Active Control ◽  
Shaking Table Test ◽  
Base Isolation ◽  
Mr Damper ◽  
Shaking Table ◽  
Isolation System ◽  
Weighting Matrix ◽  
Base Isolation System ◽  
Optimal Regulator

scholarly journals Experimental Investigation on Semi-Active Control of Base Isolation System Using Magnetorheological Dampers for Concrete Frame Structure

2019 ◽  
Vol 9 (18) ◽  
pp. 3866 ◽  
Author(s):  
Weiqing Fu ◽  
Chunwei Zhang ◽  
Mao Li ◽  
Cunkun Duan
Keyword(s):  
Optimal Control ◽  
Control System ◽  
Active Control ◽  
Shaking Table Test ◽  
Base Isolation ◽  
Mr Damper ◽  
Shaking Table ◽  
Engineering Practice ◽  
Isolation System ◽  
Large Earthquakes

The traditional passive base isolation is the most widely used method in the engineering practice for structural control, however, it has the shortcoming that the optimal control frequency band is significantly limited and narrow. For the seismic isolation system designed specifically for large earthquakes, the structural acceleration response may be enlarged under small earthquakes. If the design requirements under small earthquakes are satisfied, the deformation in the isolation layer may become too large to be accepted. Occasionally, it may be destroyed under large earthquakes. In the isolation control system combined with rubber bearing and magnetorheological (MR) damper, the MR damper can provide instantaneous variable damping force to effectively control the structural response at different input magnitudes. In this paper, the control effect of semi-active control and quasi-passive control for the isolation control system is verified by the shaking table test. In regard to semi-active control, the linear quadratic regulator (LQR) classical linear optimal control algorithm by continuous control and switch control strategies are used to control the structural vibration response. Numerical simulation analysis and shaking table test results indicate that isolation control system can effectively overcome the shortcoming due to narrow optimum control band of the passive isolation system, and thus to provide optimal control for different seismic excitations in a wider frequency range. It shows that, even under super large earthquakes, the structure still exhibits the ability to maintain overall stability performance.

scholarly journals SEMI-ACTIVE BASE-ISOLATION SYSTEM BY MR DAMPER UTILIZING OPTIMAL REGULATOR THEORY

2003 ◽  
Vol 68 (567) ◽  
pp. 47-54 ◽  
Author(s):  
Takeshi HIWATASHI ◽  
Yoichi SHIOZAKI ◽  
Hideo FUJITANI ◽  
Satsuya SODA
Keyword(s):  
Base Isolation ◽  
Mr Damper ◽  
Isolation System ◽  
Base Isolation System ◽  
Optimal Regulator ◽  
Active Base

Verification of real-time hybrid tests of response control of base isolation system by MR damper comparing shaking table tests

2008 ◽  
Author(s):  
Hideo Fujitani ◽  
Hiroaki Sakae ◽  
Rui Kawasaki ◽  
Hideki Fujii ◽  
Takeshi Hiwatashi ◽  
...  
Keyword(s):  
Real Time ◽  
Base Isolation ◽  
Mr Damper ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Response Control ◽  
Isolation System ◽  
Base Isolation System

scholarly journals Shaking Table Test of a Model Bridge with Sliding Type Base Isolation System.

1995 ◽  
pp. 167-177 ◽  
Author(s):  
Susumu Okamoto ◽  
Shunji Fujii ◽  
Daisuke Ozaki ◽  
M. C. Constantinou ◽  
P. C. Tsopelas
Keyword(s):  
Shaking Table Test ◽  
Base Isolation ◽  
Shaking Table ◽  
Isolation System ◽  
Base Isolation System

scholarly journals DEVELOPMENT OF NEW BASE-ISOLATION SYSTEM FOR DETACHED HOUSES AND FULL-SCALE SHAKING TABLE TEST

2008 ◽  
Vol 14 (27) ◽  
pp. 49-54 ◽  
Author(s):  
Ken'ichi KAWAGUCHI ◽  
Keiichi ABE ◽  
Jun'ichiro ABE ◽  
Tomoyasu TAGUCHI ◽  
Ryota TAKAHAMA
Keyword(s):  
Shaking Table Test ◽  
Base Isolation ◽  
Full Scale ◽  
Shaking Table ◽  
Isolation System ◽  
Base Isolation System

Study on Multifunctional Base Isolation System Using Air-Floating Technique

2020 ◽  
Author(s):  
Osamu Furuya ◽  
Kiyotaka Takito ◽  
Hiroshi Kurabayashi ◽  
Kunio Sampei ◽  
Koji Yamazaki
Keyword(s):  
Performance Evaluation ◽  
Seismic Isolation ◽  
Vibration Isolation ◽  
Shaking Table Test ◽  
Base Isolation ◽  
Shaking Table ◽  
Response Analysis ◽  
Vibration Isolator ◽  
Isolation System ◽  
Base Isolation System

Abstract Vibration isolation devices are generally applied to equipment that dislikes vibration installed in buildings. Since the vibration isolator is intended for small vibration input, the damage has been frequently confirmed with excessive vibration input such as an huge earthquake motion. Therefore, the development of a seismic isolation device with a vibration isolation function is desired for important equipment and expensive manufacturing equipment. However, the vibration region targeted by the vibration isolator and the vibration region of the seismic input are at completely different levels. In this study, the authors propose a seismic isolation system using air floating technique to cope with such different vibration levels. In this paper, basic concept, basic performance, preliminary performance evaluation by nonlinear time response analysis, and performance evaluation by shaking table test.

Shaking Table Test Study on Mid-Story Isolation Structures

2012 ◽  
Vol 446-449 ◽  
pp. 378-381
Author(s):  
Jian Min Jin ◽  
Ping Tan ◽  
Fu Lin Zhou ◽  
Yu Hong Ma ◽  
Chao Yong Shen
Keyword(s):  
Seismic Response ◽  
Seismic Isolation ◽  
Shaking Table Test ◽  
Base Isolation ◽  
Shaking Table ◽  
Natural Period ◽  
Isolation System ◽  
Isolation Layer ◽  
Lead Rubber Bearing ◽  
Complex Structural

Mid-story isolation structure is developing from base isolation structures. As a complex structural system, the work mechanism of base isolation structure is not entirely appropriate for mid-story isolation structure, and the prolonging of structural natural period may not be able to decrease the seismic response of substructure and superstructure simultaneously. In this paper, for a four-story steel frame model, whose prototype first natural period is about 1s without seismic isolation design, the seismic responses and isolation effectiveness of mid-story isolation system with lead rubber bearing are studied experimentally by changing the location of isolation layer. Respectively, the locations of isolation layer are set at bottom of the first story, top of the first story, top of the second story and top of the third story. The results show that mid-story isolation can reduce seismic response in general, and substructure acceleration may be amplified.

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