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Expedient secondary functions of flexible piezoelectrics for biomedical energy harvesting

Bioactive Materials 2023年第4期22卷 291-311页

作者： Yuan Wang Min Hong Jeffrey Venezuela Ting Liu Matthew Dargusch Centre for Advanced Materials Processing and Manufacturing(AMPAM) The University of QueenslandBrisbaneQueensland4072Australia Centre for Future Materials University of Southern QueenslandSpringfieldQueensland4300Australia

Flexible piezoelectrics realise the conversion between mechanical movements and electrical power by conformally attaching onto curvilinear surfaces,which are promising for energy harvesting of biomedical devices due to their sustainable body movements and/or deformations.Developing secondary functions of flexible piezoelectric energy harvesters is becoming increasingly significant in recent years via aiming at issues that cannot be addressed or mitigated by merely increasing piezoelectric efficiencies.These issues include loose interfacial contact and pucker generation by stretching,power shortage or instability induced by inadequate mechanical energy,and premature function degeneration or failure caused by fatigue fracture after cyclic deformations.Herein,the expedient secondary functions of flexible piezoelectrics to mitigate above issues are reviewed,including stretchability,hybrid energy harvesting,and self-healing.Efforts have been devoted to understanding the state-of-the-art strategies and their mechanisms of achieving secondary functions based on piezoelectric fundamentals.The link between structural characteristic and function performance is unravelled by providing insights into carefully selected progresses.The remaining challenges of developing secondary functions are proposed in the end with corresponding outlooks.The current work hopes to help and inspire future research in this promising field focusing on developing the secondary functions of flexible piezoelectric energy harvesters.

关键词： Flexible piezoelectrics Stretchable hybrid energy harvesting Self-healing

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Experimental and theoretical analysis of a hybrid vibration energy harvester with integrated piezoelectric and electromagnetic interaction

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第11期24卷 991-1002页

作者： Shifan HUANG Weihao LUO Zongming ZHU Zhenlong XU Ban WANG Maoying ZHOU Huawei QIN School of Mechanical Engineering Hangzhou Dianzi UniversityHangzhou 310018China

harvesting vibration energy has attracted the attention of researchers in recent decades as a promising approach for powering wireless sensor networks.The hybridization of piezoelectricity and electromagnetism has proven helpful in the improvement of vibration energy harvesting.In this study,we explore the integration of piezoelectric and electromagnetic parts in one vibration energy harvesting device.Lumped-parameter models of the system are derived considering the different connection topologies of the piezoelectric and electromagnetic parts.Numerical predictions from these models are compared with experimental results to throw light on the nonlinearities in the system.Modifications of the system are also explored to provide insights into opportunities to improve its performance and that of future vibration energy harvesters.

关键词： hybrid energy harvesting Nonlinear interaction Magnetic spring Piezoelectricity Electromagnetism

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A new energy harvester using a piezoelectric and suspension electromagnetic mechanism

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第12期14卷 890-897页

作者： Xiao-biao SHAN Shi-wei GUAN Zhang-shi LIU Zhen-long XU Tao XIE School of Mechatronics Engineering Harbin Institute of Technology Shenyang Institute of Automation Chinese Academy of Science

This study presents a new design of a piezoelectric-electromagnetic energy harvester to enlarge the frequency bandwidth and obtain a larger energy output.This harvester consists of a primary piezoelectric energy harvesting device,in which a suspension electromagnetic component is added.A coupling mathematical model of the two independent energy harvesting techniques was established.Numerical results show that the piezoelectric-electromagnetic energy harvester has three times the bandwidth and higher power output in comparison with the corresponding stand-alone,single harvesting mode devices.The finite element models of the piezoelectric and electromagnetic systems were developed,respectively.A finite element analysis was performed.Experiments were carried out to verify the validity of the numerical simulation and the finite element results.It shows that the power output and the peak frequency obtained from the numerical analysis and the finite element simulation are in good agreement with the experimental results.This study provides a promising method to broaden the frequency bandwidth and increase the energy harvesting power output for energy harvesters.

关键词： hybrid energy harvesting Piezoelectric Electromagnetic Environmental vibration

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