Energy Harvesting From Building Seismic Isolation With Multi-Mode Resonant Shunt Circuits

2014 ◽  
Author(s):  
Mincan Cao ◽  
Lei Zuo
Keyword(s):  
Energy Harvesting ◽  
Vibration Control ◽  
Seismic Isolation ◽  
Large Scale ◽  
Base Isolation ◽  
Numerical Study ◽  
Vibration Reduction ◽  
Host Structure ◽  
Multi Mode ◽  
Shunt Circuit

A novel electromagnetic transducer shunt circuit is proposed in this paper for dual-functional energy harvesting and vibration control of building seismic isolation. In recent decades, base isolation systems are widely used in low and middle rise buildings. Even though base isolation can filter out high frequency excitation from earthquake, it still necessary to consider higher order modes’ vibration in host structure. The new design extends the multi-mode shunt circuit technology in piezoelectric area in order to achieve good vibration suppression into the seismic isolation of multi degree of freedoms (MDOF) of host structure of buildings, and use multi-mode circuit to achieve both energy harvesting and seismic vibration control. A numerical study of simplified two degree of freedom base isolation is presented in this paper. This passive system is also examined by giving recorded earthquake excitation. The stimulation results show that this new design could take advantage both of low-pass filtering capacity of base isolation system and resonant vibration reduction of electromagnetic shunt circuit. It is also observed that parameters selected for vibration reduction of building can effectively achieve large-scale energy harvesting at same time.

An improved multi-mode seismic vibration control method using multiple tuned mass dampers

2022 ◽  
pp. 136943322110509
Author(s):  
Xuan Zhang ◽  
Qiang Han ◽  
Kaiming Bi ◽  
Xiuli Du
Keyword(s):  
Vibration Control ◽  
Control Method ◽  
Numerical Study ◽  
Ground Motions ◽  
Vibration Modes ◽  
Tuned Mass Dampers ◽  
Location Factor ◽  
Mass Damper ◽  
Multi Mode ◽  
Multiple Tuned Mass Dampers

Multiple vibration modes of an engineering structure might be excited by earthquake ground motions. Multiple tuned mass dampers (MTMDs) are widely used to control these multi-mode vibrations. However, in the commonly used MTMD system, the mass element in each tuned mass damper (TMD) is normally assumed to be the same. To improve the performance of MTMDs for seismic-induced vibration control, non-uniform MTMD masses are adopted in the present study to improve the mass utilization of TMD, and a location factor is proposed to determine the best location of each TMD in the MTMD system. The effectiveness of the proposed method is validated through numerical study. The results show that the proposed method effectively reduces the seismic responses of the structure induced by multiple vibration modes.

Experiment Verification of Seismic Isolation Device Having Charging Function

2017 ◽  
Author(s):  
Takashi Yamaguchi ◽  
Hayato Nakakoji ◽  
Nanako Miura ◽  
Akira Sone
Keyword(s):  
Control System ◽  
Vibration Control ◽  
Control Systems ◽  
Seismic Isolation ◽  
Active Vibration Control ◽  
Vibration Reduction ◽  
Large Earthquake ◽  
Energy Regeneration ◽  
Active Vibration ◽  
Isolation Device

In late years, many base isolated structures are planned as seismic design, because they suppress vibration response significantly against large earthquake. In addition, to achieve greater safety, semi-active or active vibration control system is installed in the structures as. Semi-active and active vibration control systems are more effective to large earthquake than passive one vibration control system in terms of vibration reduction. However semi-active and active vibration control systems cannot operate as required when external power supply is cut off. To solve the problem of energy consumption, we propose a self-powered active seismic isolation device which achieves active control system using regenerated vibration energy. This device doesn’t require external energy to produce control force. The purpose of this paper is to propose the seismic isolation device having charging function and verified its performance by experiment. In our previous research[1], we proposed the new model and optimized the control system and passive elements such as spring coefficients and damping coefficients using genetic algorithm. As a result, we proposed the model which is superior to the previous model in terms of vibration reduction and energy regeneration. In this study, we conducted an experiment and show its results. As a results, we confirmed the vibration reduction and energy regeneration of the seismic isolation device having charging function.

Base Isolation: Linear Theory and Design

1990 ◽  
Vol 6 (2) ◽  
pp. 223-244 ◽  
Author(s):  
James M. Kelly
Keyword(s):  
Linear Theory ◽  
Seismic Isolation ◽  
Large Scale ◽  
Base Isolation ◽  
Ground Movement ◽  
Engineering Profession ◽  
Shake Table Testing ◽  
Static Testing ◽  
Degree Of Acceptance ◽  
Isolation Systems

The idea that a building can be uncoupled from the damaging effects of the ground movement produced by a strong earthquake has appealed to inventors and engineers for more than a century. Many ingenious devices have been proposed to achieve this result, but very few have been implemented and the concept now referred to as base isolation or seismic isolation has yet to be generally accepted by the engineering profession. Although most of the proposed systems are unacceptably complicated, in recent years a few practical systems have been developed and implemented. While some of these systems have been tested on large-scale shaking tables, none have to date been tested as-built by a strong earth tremor. The shake table testing and related static testing of full-scale components such as isolation bearings, however, has led to a certain degree of acceptance by the profession and it is possible that the number of practical implementations of base isolation will increase quite dramatically in the next few years. This paper describes recent implementations of base isolation and describes an approximate linear theory of isolation which can be used for the design of base isolation systems that use multilayer elastomeric isolators.

Regenerative Base Isolation With Multi-Resonant Electromagnetic Shunt Dampers

2017 ◽  
Author(s):  
Yalu Pei ◽  
Yilun Liu ◽  
Lei Zuo
Keyword(s):  
Energy Harvesting ◽  
Vibration Isolation ◽  
Base Isolation ◽  
Single Mode ◽  
Relative Displacement ◽  
Ground Acceleration ◽  
Isolation System ◽  
Dual Functional ◽  
Base Isolation System ◽  
Shunt Circuit

Electromagnetic (EM) shunt damping has been recently proposed for dual-functional vibration isolation and energy harvesting. This paper proposed two multi-resonant electromagnetic shunt damper configurations, namely in parallel and in series, with application to the building base isolation system. The electromagnetic shunt circuit parameters were optimized based on the H2 criteria to minimize the RMS relative displacement for the concern of building safety subjected to broad bandwidth ground acceleration excitations. The performance of the proposed multi-resonant electromagnetic shunt dampers was compared with traditional multiple tuned mass dampers (TMDs). It shows that, for multiple TMDs and multi-resonant electromagnetic shunt dampers with 5% total stiffness ratio, the parallel electromagnetic shunt damper can achieve the best vibration isolation performance. Case study of a base-isolated structure was analyzed in both the time and frequency domain to investigate the effectiveness of the multimode electromagnetic shunt resonances. It shows that both multimode shunt circuits outperform the single mode shunt circuit by suppressing the primary and the second vibration modes simultaneously. Comparatively, the parallel shunt damper is more effective in vibration isolation and energy harvesting, and is also more robust in parameter mistuning than the series shunt damper. This paper further experimentally validated the effectiveness of the multi-resonant electromagnetic shunt damper on a scaled-down base-isolated building.

scholarly journals Semi-Active Vibration Control Based on a Smart Exciter with an Optimized Electrical Shunt Circuit

2021 ◽  
Vol 11 (20) ◽  
pp. 9404
Author(s):  
Yi Wang ◽  
Thomas Kletschkowski
Keyword(s):  
Vibration Control ◽  
Active Vibration Control ◽  
Vibration Reduction ◽  
Structural Vibration ◽  
Simulation Framework ◽  
Structural Vibrations ◽  
New Type ◽  
Active Vibration ◽  
Reduction Effect ◽  
Shunt Circuit

A smart exciter coupled to cabin panels can be used as a new type of loudspeaker for emergency announcements in the aircraft cabin. The same device can also be used as a semi-active vibration control system which is effective in reducing the amplitude of structural vibration. The objective of this paper is to investigate the potential of vibration reduction using a smart exciter in combination with an optimized resistive-inductive shunt circuit, which serves as an absorbing network. First, the vibration reduction effect has been analyzed numerically using a simulation framework realized with COMSOL and MATLAB/Simulink. In a second step, the reduction effect of the smart exciter together with a resistive-inductive shunt circuit, which is produced by the Center of Applied Aeronautical Research (Zentrum für Angewandte Luftfahrtforschung GmbH, Hamburg, Germany), has been investigated experimentally. The results presented here prove that the smart exciter together with a resistive-inductive shunt can be highly effective in reducing structural vibrations.

Vibration Control of a Floating Raft System by Synchrophasing of Electrical Machines: An Experimental Study

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
Tiejun Yang ◽  
Di Huang ◽  
Xinhui Li ◽  
Michael J. Brennan ◽  
Liubin Zhou ◽  
...  
Keyword(s):  
Vibration Control ◽  
Large Scale ◽  
Asynchronous Motor ◽  
Electrical Power ◽  
Vibration Reduction ◽  
Electrical Machines ◽  
Dynamic Force ◽  
Floating Raft ◽  
System Reduction ◽  
System Vibration

This paper describes an experimental investigation into the vibration control of multiple electrical machines installed on a large-scale floating raft system. Vibration transmission to a flexible hull-like structure that supports the floating raft is controlled by adjusting the phases of the electrical power supply to the machines—a technique known as synchrophasing. Each machine is driven by a phase asynchronous motor and has two counter rotating shafts with adjustable eccentric masses, which allows the dynamic force generated by each machine to be set independently. Up to four rotating machines are considered. A genetic algorithm is used in the search for the optimum relative phases between each machine, because it is impractical to carry out an exhaustive search of the huge number of possible phase combinations. It is demonstrated that vibration control using synchrophasing is feasible in a marine environment, and can achieve significant vibration reduction, by simply adding some sensors and a control system. Reduction in the total transmitted vibration, as measured by the sum of the squared accelerations from 22 error sensors on the hull-like structure, was found to be up to 13 dB, and vibration reduction at higher harmonic frequencies was found to be up to 51 dB.

scholarly journals Interaction of Very Large Scale Motion of Coherent Structures with Sediment Particle Exposure

Water ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 248
Author(s):  
Sencer Yücesan ◽  
Daniel Wildt ◽  
Philipp Gmeiner ◽  
Johannes Schobesberger ◽  
Christoph Hauer ◽  
...  
Keyword(s):  
Coherent Structures ◽  
Large Scale ◽  
Numerical Study ◽  
Local Maximum ◽  
Wave Number ◽  
Exposure Level ◽  
Sediment Particle ◽  
High Wave Number ◽  
Large Scale Motion ◽  
Scale Motion

A systematic variation of the exposure level of a spherical particle in an array of multiple spheres in a high Reynolds number turbulent open-channel flow regime was investigated while using the Large Eddy Simulation method. Our numerical study analysed hydrodynamic conditions of a sediment particle based on three different channel configurations, from full exposure to zero exposure level. Premultiplied spectrum analysis revealed that the effect of very-large-scale motion of coherent structures on the lift force on a fully exposed particle resulted in a bi-modal distribution with a weak low wave number and a local maximum of a high wave number. Lower exposure levels were found to exhibit a uni-modal distribution.

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