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

Shaking Table Tests of the Smart Restorable Sliding Base Isolation System (SRSBIS)

2011 ◽  
Vol 15 (8) ◽  
pp. 1157-1177 ◽  
Author(s):  
Donatello Cardone ◽  
Peyman Narjabadifam ◽  
Domenico Nigro
Keyword(s):  
Base Isolation ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Isolation System ◽  
Base Isolation System

Applications of Multiple Trench Friction Pendulum System to Seismic Mitigation of Structures

2008 ◽  
Author(s):  
C. S. Tsai ◽  
Jeng-Wen Lin ◽  
Yung-Chang Lin ◽  
Chia-Chi Chen
Keyword(s):  
Base Isolation ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Natural Period ◽  
Isolation System ◽  
Pendulum System ◽  
Base Isolation System ◽  
Friction Pendulum ◽  
Seismic Mitigation ◽  
Friction Pendulum System

In order to promote seismic resistance capability of structures and simplify the manufacturing processes of an isolator, a new base isolation system called the multiple trench friction pendulum system (MTFPS) is proposed. The investigations for the proposed isolator have been carried out to address its mechanical characteristics and to assess its performance in seismic mitigation through a series of shaking table tests in this study. The MTFPS isolator can provide different natural periods, displacement capacities and damping effects in any two independent directions. The natural period and damping effect for a MTFPS isolator change continually during earthquakes. Results from the shaking table tests on a scaled three-story structure isolated with MTFPS isolators illustrate that the proposed MTFPS isolator can isolate most earthquake induced energy and provide good protection for structures from earthquake damage. In addition, the mathematical formulations for the MTFPS isolator have also been derived to examine its characteristics.

scholarly journals Polymeric Bearings as a new base isolation system suitable for mitigating machine-induced vibrations

2018 ◽  
Vol 211 ◽  
pp. 17001 ◽  
Author(s):  
Tomasz Falborski ◽  
Robert Jankowski
Keyword(s):  
Base Isolation ◽  
Excitation Frequency ◽  
Hysteresis Loops ◽  
Shaking Table ◽  
Damping Properties ◽  
Structural Vibrations ◽  
Isolation System ◽  
Equivalent Damping ◽  
Flexible Polymer ◽  
Base Isolation System

The present paper summarizes the preliminary results of the experimental shaking table investigation conducted in order to verify the effectiveness of a new base isolation system consisting of Polymeric Bearings in reducing strong horizontal machine-induced vibrations. Polymeric Bearing considered in the present study is a prototype base isolation system, which was constructed with the use of a specially prepared flexible polymer with improved damping properties. Dynamic oscillatory tests, during which a concrete base slab supported by four Polymeric Bearings was subjected to horizonal sinusoidal excitations characterized by different frequencies and amplitudes, were conducted in order to determine the damping properties of Polymeric Bearings and their effectiveness in mitigating structural vibrations. Equivalent damping ratios for every excitation frequency considered were determined using the experimentally obtained hysteresis loops. Final conclusions are presented and the results discussed.

Response Control Performance Evaluation of MR Damper by Shaking Table Tests and Real-Time Hybrid Tests

2008 ◽  
Vol 56 ◽  
pp. 212-217 ◽  
Author(s):  
Hideo Fujitani ◽  
Hiroaki Sakae ◽  
Mai Ito ◽  
Takeshi Hiwatashi
Keyword(s):  
Real Time ◽  
Sliding Mode ◽  
Structural Response ◽  
Mr Damper ◽  
Shaking Table ◽  
Magnetorheological Damper ◽  
Control Force ◽  
Building Structures ◽  
Shaking Table Tests ◽  
Hybrid Test

Magnetorheological damper (MR damper) has been expected to control the response of civil and building structures in recent years, because of its large force capacity and variable force characteristics. In this paper, a series of real-time hybrid test was conducted and the results of real time hybrid tests were compared to those of shaking table tests. To determine the control force of the MR damper, skyhook control and sliding mode control theory were employed. As the results, the validity of real-time hybrid test was verified. This paper describes the capability of MR damper to control the structural response.

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