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Performance enhancement of a viscoelastic bistable energy harvester using time-delayed feedback control

Chinese Physics B 2024年第6期33卷 142-154页

作者：黄美玲杨勇歌刘洋 School of Mathematics and Statistics Guangdong University of TechnologyGuangzhou 510520China State Key Laboratory for Strength and Vibration of Mechanical Structures Xi'an Jiaotong UniversityXi'an 710049China Exeter Small-Scale Robotics Laboratory Engineering DepartmentUniversity of ExeterNorth Park RoadExeter EX44QFUK

This paper focuses on the stochastic analysis of a viscoelastic bistable energy harvesting system under colored noise and harmonic excitation, and adopts the time-delayed feedback control to improve its harvesting efficiency. Firstly, to obtain the dimensionless governing equation of the system, the original bistable system is approximated as a system without viscoelastic term by using the stochastic averaging method of energy envelope, and then is further decoupled to derive an equivalent system. The credibility of the proposed method is validated by contrasting the consistency between the numerical and the analytical results of the equivalent system under different noise conditions. The influence of system parameters on average output power is analyzed, and the control effect of the time-delayed feedback control on system performance is compared. The output performance of the system is improved with the occurrence of stochastic resonance(SR). Therefore, the signal-to-noise ratio expression for measuring SR is derived, and the dependence of its SR behavior on different parameters is explored.

关键词： energy harvesting bistability stochastic averaging method stochastic resonance time-delayed feedback control

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Compensation for time-delayed feedback bang-bang control of quasi-integrable Hamiltonian systems

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中国科学:技术科学 2010年第3期 338-338页

作者： LIU ZhongHua1 & ZHU WeiQiu2 1 Department of Civil Engineering,Xiamen University,Xiamen 361005,China 2 Department of Mechanics,State Key Laboratory of Fluid Power Transmission and control,Zhejiang University,Hangzhou 310027,China

The stochastic averaging method for quasi-integrable Hamiltonian systems with time-delayed feedback bang-bang control is first ***,two time delay compensation methods,namely the method of changing control force amplitude (CFA) and the method of changing control delay time (CDT),are *** conditions applicable to each compensation method are ***,an example is worked out in detail to illustrate the application and effectiveness of the proposed methods and the two compensation methods in combination.

关键词： time-delayed feedback control compensation method bang-bang control quasi-integrable Hamiltonian system

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Stochastic Hopf bifurcation of quasi-integrable Hamiltonian systems with delayed feedback control

Stochastic Hopf bifurcation of quasi-integrable Hamiltonian ...

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第九届全国动力学与控制学术会议

作者： LIU Zhong-hua ZHU Wei-qiu Department of Civil Engineering Xiamen University Department of Mechanics Zhejiang University

time delay is usually unavoidable in feedback control systems due to time spent in measuring and estimating the system state,calculating and executing the control forces,*** time delay often leads to instability or poor performance of the controlled ***,the issue of time delay has drawn much attention of the control *** stochastic Hopf bifurcation of multi-degree-of-freedom (MDOF) quasi-integrable Hamiltonian systems with multi-time-delayed feedback control subject to wide-band noise excitations is ***,the time-delayed

关键词： Stochastic Hopf bifurcation Stochastic averaging time-delayed feedback control

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