Principle of Piezoelectric Passive Dampers

2021 ◽  
pp. 99-108
Keyword(s):  
Passive Dampers

Supplemental dampers in base-isolated buildings to mitigate large isolator displacement under earthquake excitations

2015 ◽  
Vol 48 (2) ◽  
pp. 100-117 ◽  
Author(s):  
Daniel H. Zelleke ◽  
Said Elias ◽  
Vasant A. Matsagar ◽  
Arvind K. Jain
Keyword(s):  
Equations Of Motion ◽  
Time History ◽  
Coupled Equations ◽  
History Analysis ◽  
Base Isolator ◽  
Fixed Base ◽  
Passive Dampers ◽  
Supplemental Dampers ◽  
Isolation Systems ◽  
Storey Building

The effect of viscous, viscoelastic, and friction supplemental dampers on the seismic response of base-isolated building supported by various isolation systems is investigated. Although base-isolated buildings have an advantage in reducing damage to the superstructure, the displacement at the isolation level is large, especially under near-fault ground motions. The influence of supplemental dampers in controlling the isolator displacement and other responses of base-isolated building is investigated using a multi-storey building frame. The coupled equations of motion are derived, solved and time history analysis is carried out on a building modeled with fifteen combinations of five isolation systems and three passive dampers. The seismic responses are compared with that of the fixed-base and base-isolated buildings. Based on the results, it is concluded that supplemental dampers are beneficial to control the large deformation at the isolator level. Parametric study is conducted and optimum ranges of damper parameters to achieve reduced isolator displacement without adverse effect on the other responses are determined. Further, it is concluded that the combination of the resilient-friction base isolator (R-FBI) and viscous damper is the most effective in reducing the bearing displacement without significant increase in superstructure forces.

SIMULTANEOUS OPTIMIZATION OF PASSIVE DAMPERS FOR THE SEISMIC CONTROL IN STRUCTURES

2015 ◽  
Author(s):  
Sergio Pastor Ontiveros Pérez ◽  
Letícia Fleck Fadel Miguel ◽  
Leandro Fleck Fadel Miguel
Keyword(s):  
Simultaneous Optimization ◽  
Seismic Control ◽  
Passive Dampers

scholarly journals Some aspects of design and application of inertial dampers

2018 ◽  
Vol 178 ◽  
pp. 06010 ◽  
Author(s):  
Maciej Dutkiewicz ◽  
Irena Gołębiowska ◽  
Ivan Shatskyi ◽  
Vasyl Shopa ◽  
Andrii Velychkovych
Keyword(s):  
Transmission Lines ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Gas Industry ◽  
High Rise ◽  
Overhead Transmission Lines ◽  
Common Effect ◽  
Vibration Impact ◽  
Passive Dampers ◽  
Particle Dampers

Over the last years, there has been intensive development of technologies applied to protect structures such as overhead transmission lines, chimneys, high rise buildings from excessive dynamic effects leading to their damage or destruction. In the paper special attention is put on the system of passive dampers applied to overhead transmission lines and dampers used in oil and gas industry. The efficiency of the aeolian damper is presented. The constructions of weighted drill pipes with vibration-impact particle dampers designed to absorb the energy of longitudinal and twisting oscillations of the drill tool are described. The advantage of a multi-container absorber is substantiated. The application aspects of the inertial dampers developed by the authors are combined using a common effect based on the antiresonance phenomenon.

Experimental evaluation of eccentric rotational channel-type damping system for vibration control of building structures

2019 ◽  
Vol 23 (2) ◽  
pp. 360-373
Author(s):  
Hyeong-Gook Kim ◽  
Kil-Hee Kim
Keyword(s):  
Test Model ◽  
Building Structures ◽  
Behavior Prediction ◽  
Secondary System ◽  
Passive Dampers ◽  
Scale Test ◽  
Vibration Tests ◽  
Simple Behavior ◽  
Channel Type ◽  
Damping Systems

A theoretical and experimental investigation of an eccentric rotational channel-type damping system is presented. The proposed damping system can incorporate any type of existing passive dampers and provide a wider field of view to residents compared with existing damping systems. Furthermore, the efficiency of the proposed damping system can be magnified by modifying the geometry of the channel-type secondary system. Cyclic loading and free vibration tests of a full-scale test model with steel dampers were conducted to investigate the validity of the suggested simple behavior prediction model and the vibration characteristics of the proposed damping system. The experimental results were in good agreement with the numerical analysis. The results of numerical prediction studies on a single degree of freedom system with the proposed damping system also showed the effect of the eccentric rotational channel-type damping system on seismic response reduction.

Passive Control Analysis and Design of Twin-Tower Structure with Chassis

2020 ◽  
Vol 20 (06) ◽  
pp. 2040010
Author(s):  
Qiaoyun Wu ◽  
Hai Feng ◽  
Shiye Xiao ◽  
Hongping Zhu ◽  
Xixuan Bai
Keyword(s):  
Minimum Energy ◽  
Degree Of Freedom ◽  
Vibration Energy ◽  
Control Analysis ◽  
Numerical Examples ◽  
Analysis And Design ◽  
Mdof Systems ◽  
Tower Structure ◽  
Passive Dampers ◽  
Analytical Expressions

In this paper, a symmetrical twin-tower structure with chassis connected with passive dampers is coupled as 2-DOF (degree of freedom) model. Using the stationary white noise as seismic excitation, the frequency–response function and the vibration energy expression of the symmetrical twin-tower structure are established based on the simplified 2-DOF model. Furthermore, based on the principle of minimum energy, the analytical expressions of the optimization parameters of two kinds of passive dampers are deduced, and the effectiveness of the dampers with optimized coefficients on structural control is verified by numerical examples of 2-DOF and MDOF (multi-degree-of-freedom) systems, respectively. Finally, the control effects of the two kinds of dampers under different control strategies on the responses of displacement of the top, base shear, structural vibration energy, and maximum inter-story drift of the symmetrical twin-tower structure are discussed through three-dimensional finite element numerical examples. It is verified that the analytical expressions of optimum parameters of the two kinds of dampers proposed based on the 2-DOF model are also beneficial to reduce the responses of the MDOF systems and actual engineering.

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