Energy harvesting potential of tuned inertial mass electromagnetic transducers

Asai, Takahiro; Araki, Yoshikazu; Ikago, Kohju

doi:10.1016/j.ymssp.2016.07.048

Cited by 78 publications

(46 citation statements)

References 24 publications

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“…[16][17][18] It was subsequently utilized in other mechanical systems such as motorcycles, [19] trains, [20] optical tables, [21] aircraft landing gears, [22] storage tank, [23] and energy-harvesting systems. [24,25] There have also been attempts to use inerter-based systems to control the dynamic responses of civil structures. Around the same time as the introduction of inerters, or even earlier, Arakaki et al [26] used the ball screw mechanism to amplify the efficient viscous damping force of a viscous damper for the seismic control of structures.…”

Section: Introductionmentioning

confidence: 99%

Design of structure with inerter system based on stochastic response mitigation ratio

Pan

Zhang

2018

Struct Control Health Monit

113

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Summary An easy‐to‐use method for a practical design of single‐degree‐of‐freedom (SDOF) structures with inerter systems was developed. The method adopts the stochastic vibration response mitigation ratio as the design index, and expressions of the closed‐form stochastic response are used to evaluate the structural response and optimize the design parameters. Three basic types of inerter systems with tuning and damping magnification mechanisms were considered in this study. The closed‐form stochastic responses of SDOF structures with inerter systems under white‐noise excitations were derived on the basis of the equations of motion. In addition, the response variation patterns due to changes in key parameters of the inerter system were investigated, and the parameter optimization approaches for different inerter systems are proposed on the basis of the response variation patterns. The use of the closed‐form stochastic response mitigation ratio as the design index leads to a rational and simple design process, with the tuning or response extremum conditions employed as complementary conditions for determining the key design parameters. Thus, the proposed method involves the solution of a set of nonlinear equations. Fitted empirical design formulae are provided in this paper for quick calculation of the key parameters of the SDOF structure with the inerter system for a given response mitigation ratio and inherent damping ratio. Moreover, design examples are provided to verify the proposed method. The design results show that the proposed method is effective and more convenient than existing methods. Furthermore, the method can be easily extended for considering seismic excitations and design of structures with other complex‐form inerter systems.

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Section: Introductionmentioning

confidence: 99%

Design of structure with inerter system based on stochastic response mitigation ratio

Pan

Zhang

2018

Struct Control Health Monit

113

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Section: Parameter Designmentioning

confidence: 99%

“…To determine the values for k t and c t for the TMD with TIMET system, these parameters are treated as control gains for a stochastic optimal control problem subjected to a white noise input and the optimized values are sought through the algorithms presented in previous works. [17,21] By seeing the forces applied by the transducer and supporting spring of the TIMET as the control forces to the system, the equation of motion given by Equations 9 and 18 can be rewritten aŝ…”

Section: Tmd With Timetmentioning

confidence: 99%

“…Also, the fact that the ball screw mechanism is employed in both devices in common has attracted the authors' attention. Then by a combination of these two devices, tuned inertial mass electromagnetic transducers (TIMETs), which can increase energy generation efficiency, can be realized by one ball screw mechanism and have been proposed in the authors' previously published work . In that paper, the authors showed the effectiveness of the proposed device on a single‐degree‐of‐freedom (SDOF) oscillator as an energy harvester through numerical simulation studies.…”

Section: Introductionmentioning

confidence: 99%

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Structural control with tuned inertial mass electromagnetic transducers

Asai

Araki

Ikago

2017

Struct Control Health Monit

Self Cite

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Summary This paper investigates the validity of the tuned inertial mass electromagnetic transducer (TIMET) applied to building structures subjected to seismic motions. The TIMET is a device inspired by two innovative structural control devices proposed recently, that is, tuned viscous mass damper and electromagnetic transducer. The TIMET consists of a spring, an inertial mass produced by a ball screw mechanism, and an electromagnetic transducer part composed of a motor and an electrical circuit. The stiffness of the spring is tuned such that the inertial mass resonates with the vibrating building. This makes the motor installed in parallel with the inertial mass run up in an efficient way, and the vibration energy is converted to electrical energy effectively. As a result, vibration of the building decays fast and electrical energy is stored. This generated energy that is reusable for the self‐powered control systems, structural health monitoring, emergency power source, and so on. In this paper, through numerical simulation studies employing the scaled three‐story building model proposed for benchmark studies, the vibration reduction and energy harvesting capabilities of the TIMET is explored and the application potentiality to civil structures is discussed.

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“…Through the incorporation of an electromagnetic damper, which is a type of VDE, Nakamura et al [31] developed an electromagnetic inerter mass damper with variable damping force. Asai et al [32,33] achieved enhanced energy-harvesting performance using a tuned inerter. Zhang et al [10,34] proposed an isolation inerter system that used an inerter and a VDE to mitigate the vibration of a storage tank.…”

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confidence: 99%

Displacement-Dependent Damping Inerter System for Seismic Response Control

et al. 2019

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Various inerter systems utilizing velocity-dependent damping for vibration control have been developed. However, a velocity-dependent damping element may exhibit relatively poor performance compared to a displacement-dependent damping element (DDE) of equivalent damping ratio, when the structural deformation is small in the early stage of the seismic response. To address this issue, the advantage of DDE in generating a larger control force in the early stage of excitation is promoted here and enhanced by a supplemental inerter-spring-system, thus realizing a proposed novel displacement-dependent damping inerter system (DDIS). First, the influence of various DDIS-parameters is carried out by resorting to the stochastic linearization method to handle non-linear terms. Then, seismic responses of the DDIS-controlled system are evaluated in the time domain taking the non-linearity into account, thus validating the accuracy of the stochastic dynamic analysis. Several design cases are considered, all of which demonstrated damping enhancement and timely control achieved by the DDIS. The results show that the energy dissipation as well as reduction of structural displacement and acceleration accomplished by the proposed system are significant. DDIS suppresses structural responses in a timely manner, as soon as the peak excitation occurs. In addition, it is demonstrated that interactions among the inerter, spring, and DDE, which constitute the damping-enhancement mechanism, lead to a higher energy-dissipation efficiency compared to the DDE alone. enhancement mechanism. Arakaki et al. [27,28] utilized the rotation mechanism to amplify the effective damping force of a viscous damper, which is a type of velocity-dependent damping element (VDE). However, these devices did not explicitly use the mass enhancement effect until Ikago et al. [1] proposed the tuned viscous mass damper, which belongs to a type of velocity-dependent damping inerter system (VDIS). The performance of the tuned viscous mass damper control system was subsequently investigated via shaking table tests conducted on single-story systems equipped with scaled-down versions of the damper [29]. Garrido et al. [30] proposed a rotational inertia double-tuned mass damper by replacing the viscous damping of the tuned mass damper with a tuned viscous mass damper, which achieved significantly greater control than the tuned mass damper with similar additional mass ratio. Through the incorporation of an electromagnetic damper, which is a type of VDE, Nakamura et al. [31] developed an electromagnetic inerter mass damper with variable damping force. Asai et al. [32,33] achieved enhanced energy-harvesting performance using a tuned inerter. Zhang et al. [10,34] proposed an isolation inerter system that used an inerter and a VDE to mitigate the vibration of a storage tank. The effect of the mechanical layout of the system was also investigated and considered in the development of a demand-based optimal design method for the system. Ikago et al. [1] presented the closed-form ...

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Energy harvesting potential of tuned inertial mass electromagnetic transducers

Abstract: performance-guaranteed (PG) control and the LQG control proposed in the literature are applied as well. Then the numerical simulation studies are carried out and the effectiveness of the proposed energy harvester is examined by comparing the traditional electromagnetic transducers.

Cited by 78 publications

References 24 publications

Design of structure with inerter system based on stochastic response mitigation ratio

Design of structure with inerter system based on stochastic response mitigation ratio

Structural control with tuned inertial mass electromagnetic transducers

Displacement-Dependent Damping Inerter System for Seismic Response Control

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