Shaking table tests on semi-active base-isolation system by magnetorheological fluid damper

2003 ◽  
Author(s):  
Takeshi Hiwatashi ◽  
Yoichi Shiozaki ◽  
Hideo Fujitani ◽  
Chikahiro Minowa ◽  
Satsuya Soda
Keyword(s):  
Base Isolation ◽  
Magnetorheological Fluid ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Isolation System ◽  
Magnetorheological Fluid Damper ◽  
Fluid Damper ◽  
Base Isolation System ◽  
Active Base

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.

Reduction of Seismic Response of Mechanical System by Base Isolation System With Friction Bearing

2007 ◽  
Author(s):  
Shigeru Aoki ◽  
Yuji Nakanishi ◽  
Kazutoshi Tominaga ◽  
Takeshi Otaka ◽  
Tadashi Nishimura ◽  
...  
Keyword(s):  
Mechanical System ◽  
Seismic Response ◽  
Base Isolation ◽  
Low Frequency ◽  
Simulation Method ◽  
Shaking Table ◽  
Restoring Force ◽  
Isolation System ◽  
Friction Bearing ◽  
Base Isolation System

Reduction of seismic response of mechanical system is important problem for aseismic design. Some types of base isolation systems are developed and used in actual base of buildings and floors in buildings for reduction of seismic response of mechanincal system. In this paper, a base isolation system utilizing bearing with friction and restoring force of bearing is proposed. Friction bearing consists of two plates having spherical concaves and oval type metal or spherical metal with rubber. First, effectiveness of the base isolation system is examined experimentally. Using artificial time histories, the isolated table is shaken on the shaking table. The maximum value of response is reduced and sum of squares of response is significantly reduced. Power spectrum is significantly reduced in almost of all frequency regions, except for very low frequency region. Next, in order to examine reduction of seismic response of actual mechanical system, a console rack is set on the isolated plate. Seismic response is also significantly reduced. Finally, obtained results of experiment are examined by simulation method. An analytical model considering friction and restoring force is used. From simulation method, effectiveness of the proposed base isolation system is demonstrated.

Neuro-fuzzy model of hybrid semi-active base isolation system with FPS bearings and an MR damper

2006 ◽  
Vol 28 (7) ◽  
pp. 947-958 ◽  
Author(s):  
Hyun-Su Kim ◽  
Paul N. Roschke ◽  
Pei-Yang Lin ◽  
Chin-Hsiung Loh
Keyword(s):  
Base Isolation ◽  
Fuzzy Model ◽  
Mr Damper ◽  
Isolation System ◽  
Neuro Fuzzy ◽  
Base Isolation System ◽  
Active Base

530 Application of Active Base Isolation System Using Absolute Vibration Control Technology

2011 ◽  
Vol 2011 (0) ◽  
pp. _530-1_-_530-10_
Author(s):  
Osamu YOSHIDA ◽  
Mitsuru KAGEYAMA ◽  
Takeshi SANO ◽  
Hideo KATSUMATA ◽  
Fumiaki ENDO ◽  
...  
Keyword(s):  
Vibration Control ◽  
Base Isolation ◽  
Control Technology ◽  
Isolation System ◽  
Base Isolation System ◽  
Active Base
Sign in / Sign up

Export Citation Format

Share Document