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Dynamics and vibration reduction performance of asymmetric tristable nonlinear energy sink

Applied Mathematics and Mechanics(English Edition) 2024年第3期45卷 389-406页

作者： Hongyan CHEN Youcheng ZENG Hu DING Siukai LAI Liqun CHEN School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Frontier Science Center of MechanoinformaticsShanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200444China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityKowloonHong KongChina

With its complex nonlinear dynamic behavior,the tristable system has shown excellent performance in areas such as energy harvesting and vibration suppression,and has attracted a lot of *** this paper,an asymmetric tristable design is proposed to improve the vibration suppression efficiency of nonlinear energy sinks(NESs)for the first *** proposed asymmetric tristable NES(ATNES)is composed of a pair of oblique springs and a vertical ***,the three stable states,symmetric and asymmetric,can be achieved by the adjustment of the distance and stiffness asymmetry of the oblique *** governing equations of a linear oscillator(LO)coupled with the ATNES are *** approximate analytical solution to the coupled system is obtained by the harmonic balance method(HBM)and verified *** vibration suppression efficiency of three types of ATNES is *** results show that the asymmetric design can improve the efficiency of vibration reduction through comparing the chaotic motion of the NES oscillator between asymmetric steady *** addition,compared with the symmetrical tristable NES(TNES),the ATNES can effectively control smaller structural *** other words,the ATNES can effectively solve the threshold problem of TNES failure to weak ***,this paper reveals the vibration reduction mechanism of the ATNES,and provides a pathway to expand the effective excitation amplitude range of the NES.

关键词： asymmetric nonlinear energy sink(NES) tristable vibration control po-tential barrier

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Design,modeling and experiments of broadband tristable galloping piezoelectric energy harvester

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Acta Mechanica Sinica 2020年第3期36卷 592-605页

作者： Junlei Wang Linfeng Geng Shengxi Zhou Zhien Zhang Zhihui Lai Daniil Yurchenko Engineering Research Center of Energy Saving Technology and Equipment of Thermal Energy System Ministry of EducationZhengzhou 450000China School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China William G.Lowrie Department of Chemical and Biomolecular Engineering The Ohio State UniversityColumbusOH 43210USA Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen 518060China Institute of Mechanical Process&Energy EngineeringHeriot-Watt UniversityEdinburgh EH 144ASUK

Galloping based piezoelectric energy harvester is a kind of micro-environmental energy harvesting device based on flowinduced vibrations.A novel tristable galloping-based piezoelectric energy harvester is constructed by introducing a nonlinear magnetic force on the traditional galloping-based piezoelectric energy *** on Euler-Bernoulli beam theory and Kirchhoff’s law,the corresponding aero-electromechanical model is proposed and validated by a series of wind tunnel *** parametric study is performed to analyse the response of the tristable galloping-based piezoelectric energy *** results show that comparing with the galloping-based piezoelectric energy harvester,the mechanism of the tristable galloping-based piezoelectric energy harvester is more *** the increase of a wind speed,the vibration of the bluff body passes through three branches:intra-well oscillations,chaotic oscillations,and inter-well *** threshold wind speed of the presented harvester for efficiently harvesting energy is 1.0 m/s,which is decreased by 33% compared with the galloping-based piezoelectric energy *** maximum output power of the presented harvester is 0.73 mW at 7.0 m/s wind speed,which is increased by 35.3%.Compared with the traditional galloping-based piezoelectric energy harvester,the presented tristable galloping-based piezoelectric energy harvester has a better energy harvesting performance from flow-induced vibrations.

关键词： Energy harvesting Galloping tristable Flow induced vibrations

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EFFICIENT ENERGY HARVESTING FROM HUMAN MOTION BY tristable PIEZOELECTRIC CANTILEVER

EFFICIENT ENERGY HARVESTING FROM HUMAN MOTION BY TRISTABLE P...

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2015全国压电和声波理论及器件技术研讨会

作者： Wei WANG Jun-yi CAO Yun-long CAI Sheng-xi ZHOU Jing LIN State Key Laboratory for Manufacturing System Engineering Xi’an Jiao tong University

tristable energy harvester is applied to harvesting energy from human motion in order to overcome the narrowband issues of linear resonant piezoelectric energy *** on the characteristics of human motion,time-varying potential energy function of tristable oscillator with respect to the swing angle is established to derive the theoretical model for harvesting energy from the swing motion during human walking and *** restoring forces of the tristable energy harvester under different swing angles are measured and the corresponding potential energy functions are *** results under various motion speeds show that the tristable energy harvester exhibits better performance than the linear one for harvesting vibration energy from the swing motion during human walking or running.

关键词： Energy harvesting Piezoelectricity Nonlinear vibration tristable Time-varying Human motion

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