scholarly journals RESPONSE CONTROL EFFECT OF COUPLED VIBRATION CONTROL STRUCTURES USING HYSTERESIS DAMPER UNDER GROUND MOTION

2007 ◽  
Vol 72 (621) ◽  
pp. 49-56 ◽  
Author(s):  
Kenichi TAHARA ◽  
Shinji YAMAZAKI ◽  
Susumu MINAMI
Keyword(s):  
Vibration Control ◽  
Ground Motion ◽  
Coupled Vibration ◽  
Control Effect ◽  
Response Control ◽  
Control Structures

TREND OF SEISMIC RESPONSES OF EXISTING HIGH-RISE RC BUILDINGS

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Yusuke Maida ◽  
Tomofusa Akita ◽  
Nobuyuki Izumi
Keyword(s):  
Seismic Response ◽  
Ground Motion ◽  
Seismic Isolation ◽  
Rc Buildings ◽  
Response Control ◽  
Control Structures ◽  
Seismic Ground Motion ◽  
Seismic Response Control ◽  
High Rise ◽  
Seismic Resistant

This report presents studies on the seismic response of high-rise RC buildings in Japan. Data concerning the seismic response of approximately 600 high-rise RC buildings constructed from 1972 to 2015 were collected. Seismic response characteristics were analyzed by focusing on differences in seismic resistant structures, seismic response control structures, and seismic isolation structures. The results indicated that the maximum story drift ratio response under the level 1 study seismic ground motion (R) and the level 2 study seismic ground motion (R) criteria is smaller for seismic isolation structures than that of the seismic resistant structure and seismic response control structures. In addition, focusing on the R-R relationship, the correlation is low in the seismic resistant and seismic response control structures, but is almost linear in the seismic isolation structure. This is because the seismic isolation structure is designed such that the superstructure does not become plastic even with level 2 seismic ground motion.

Response Control of Variable Stiffness Structure Using Electromagnetic Clutch

2003 ◽  
Vol 7 (2) ◽  
pp. 101-107
Author(s):  
Toshihiro Irie ◽  
◽  
Kiyoshi Shingu ◽  
Keita Kitamura ◽  
Yoshihiro Takagi ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Vibration Control ◽  
Control Method ◽  
Variable Stiffness ◽  
Control Effect ◽  
Response Control ◽  
Electromagnetic Clutch

Vibration control method of a variable stiffness structure using an electromagnetic clutch is shown. The control effect is predicted by numerical simulation. On the basis of this result, an experiment is carried out using an actual apparatus to confirm the effect of the variable stiffness structure using the electromagnetic clutch.

Optimal Placement of Piezoelectric Sensors and Actuators for Controlled Flexible Linkage Mechanisms

2005 ◽  
Vol 128 (2) ◽  
pp. 256-260 ◽  
Author(s):  
Xianmin Zhang ◽  
Arthur G. Erdman
Keyword(s):  
Vibration Control ◽  
Simulation Analysis ◽  
Active Vibration Control ◽  
Optimal Placement ◽  
Control Effect ◽  
Sensors And Actuators ◽  
Piezoelectric Sensors And Actuators ◽  
Active Vibration ◽  
Flexible Mechanism ◽  
Flexible Linkage

The optimal placement of sensors and actuators in active vibration control of flexible linkage mechanisms is studied. First, the vibration control model of the flexible mechanism is introduced. Second, based on the concept of the controllability and the observability of the controlled subsystem and the residual subsystem, the optimal model is developed aiming at the maximization of the controllability and the observability of the controlled modes and minimization of those of the residual modes. Finally, a numerical example is presented, which shows that the proposed method is feasible. Simulation analysis shows that to achieve the same control effect, the control system is easier to realize if the sensors and actuators are located in the optimal positions.

Vibration Control of Space Truss Structure with Viscoelastic Laminated Composite Damper

2014 ◽  
Vol 971-973 ◽  
pp. 860-863 ◽  
Author(s):  
Bao Xian Jia ◽  
Feng Gao ◽  
Wen Feng Bian
Keyword(s):  
Vibration Control ◽  
Resonance Region ◽  
Truss Structure ◽  
Pulse Excitation ◽  
Control Effect ◽  
Modal Strain Energy ◽  
Viscoelastic Composite ◽  
Optimal Position ◽  
Space Truss ◽  
Space Truss Structure

This paper works on the vibration control of the space truss structure. The damper made of viscoelastic composite was designed according to the configuration parameters of the truss structure. The parameters of damper were obtained by using the method of modal strain energy. The optimal position configuration of the damper was determined. The truss in the time domain and frequency domain was analyzed. The dynamic characteristics of three structures which are without damper, with damper in the random position configuration and with damper in the optimal position configuration were compared in the sweep excitation and pulse excitation. The result shows that the structure with damper in the optimal position configuration has a great improvement in the amplitude of vibration in the first resonance region and the amplitude attenuation of the truss. The space truss structure with viscoelastic composite damper has excellent vibration control effect.

Vibration Control of Offshore Platforms Using a Wideband METMD System

2006 ◽  
Author(s):  
Dong Zhao ◽  
Rujian Ma ◽  
Dongmei Cai
Keyword(s):  
Vibration Control ◽  
Natural Frequency ◽  
Fem Simulation ◽  
Average Frequency ◽  
Offshore Platforms ◽  
Frequency Bandwidth ◽  
Wave Load ◽  
Control Effect ◽  
Exciting Frequency ◽  
Specific Frequency

A wideband multiple extended tuned mass dampers (METMD) system has been developed for reducing the multiple resonant responses of the platforms to all kinds of loads, such as earthquake, typhoon, tsunami and big ice load. This system is composed of several subsystems, each of which consists of one set of extended tuned mass damper (ETMD) unit covering a specific frequency bandwidth, and its average frequency is tuned to one of the first resonant frequencies of the platform. The offshore platform is simplified to a single degree-of-freedom (DOF) system to which a METMD subsystem (composed of m ETMDs) is attached and constitutes m+1 DOFs system. The total mass ratio of the METMD subsystem to the platform is 14% and the frequency ratio of the exciting frequency to the platform’s natural frequency varies in [0.5, 1.5]. The theory analysis shows that: 1) the platform has the better vibration control effect when the non-dimensional frequency bandwidth Ω, which is defined as the ratio of the frequency range to the controlled (target) platforms natural frequency, is in [0.35, 0.6]; 2) the damping coefficient ξ of ETMD systems is in [0.05, 0.15] and 3) the number of the ETMDs is 5 when Ω = 0.45 and ξ = 0.1. The FEM simulation shows that the METMD has a better vibration control effect on the mega-platforms’ vibration control under the random ocean wave load.

scholarly journals Optimal Design and Application of a Multiple Tuned Mass Damper System for an In-Service Footbridge

2019 ◽  
Vol 11 (10) ◽  
pp. 2801 ◽  
Author(s):  
Chao Wang ◽  
Weixing Shi
Keyword(s):  
Optimal Design ◽  
Vibration Control ◽  
Damping Ratio ◽  
Element Model ◽  
Frequency Bandwidth ◽  
Dynamic Amplification Factor ◽  
Control Effect ◽  
In Situ Test ◽  
Dynamic Amplification

Slender steel footbridges suffer excessive human-induced vibrations due to their low damping nature and their frequency being located in the range of human-induced excitations. Tuned mass dampers (TMDs) are usually used to solve the serviceability problem of footbridges. A multiple TMD (MTMD) system, which consists of several TMDs with different frequencies, has a wide application in the vibration control of footbridges. An MTMD system with well-designed parameters will have a satisfactory effect for vibration control. This study firstly discusses the relationship between the acceleration dynamic amplification factor and important parameters of an MTMD system, i.e., the frequency bandwidth, TMD damping ratio, central frequency ratio, mass ratio and the number of TMDs. Then, the frequency bandwidth and damping ratio optimal formulas are proposed according to the parametric study. At last, an in-service slender footbridge is proposed as a case study. The footbridge is analyzed through a finite element model and an in situ test, and then, an MTMD system is designed based on the proposed optimal design formulas. The vibration control effect of the MTMD system is verified through a series of in situ comparison tests. Results show that under walking, running and jumping excitations with different frequency, the MTMD system always has an excellent vibration control effect. Under a crowd-induced excitation with the resonance frequency, the footbridge with an MTMD system can meet the acceleration limit requirement. It is also found that the analysis result agrees well with the in situ test.

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