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Piezoelectric energy harvesting from morphing wing motions for micro air vehicles

Theoretical & Applied Mechanics Letters 2013年第5期3卷 69-72页

作者： Abdessattar Abdelkefi Mehdi Ghommem Department of Engineering Science and Mechanics Virginia TechBlacksburg Virginia 24061 USA Center for Numerical Porous Media (NumPor) King Abdullah University of Science and TechnologyThuwal 23955-6900 Kingdom of Saudi Arabia

Wing flapping and morphing can be very beneficial to managing the weight of micro air vehicles through coupling the aerodynamic forces with stability and control. In this letter, harvesting energy from the wing morphing is studied to power cameras, sensors, or communication devices of micro air vehicles and to aid in the management of their power. The aerodynamic loads on flapping wings are simulated using a three-dimensional unsteady vortex lattice method. Active wing shape morphing is considered to enhance the performance of the flapping motion. A gradient-based optimization algorithm is used to pinpoint the optimal kinematics maximizing the propellent efficiency. To benefit from the wing deformation, we place piezoelectric layers near the wing roots. Gauss law is used to estimate the electrical harvested power. We demonstrate that enough power can be generated to operate a camera. Numerical analysis shows the feasibility of exploiting wing morphing to harvest energy and improving the design and performance of micro air vehicles.

关键词： energy harvesting piezoelectric material micro air vehicles wing morphing

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Performance enhancement of wing-based piezoaeroelastic energy harvesting through freeplay nonlinearity

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Theoretical & Applied Mechanics Letters 2013年第4期3卷 14-17页

作者： Abdessattar Abdelkefi Muhammad R. Hajj Department of Engineering Science and Mechanics Virginia Tech

We investigate experimentally how controlled freeplay nonlinearity affects harvesting energy from a wing-based piezoaeroelastic energy harvesting system. This system consisits of a rigid airfoil which is supported by a nonlinear torsional spring （freeplay） in the pitch degree of freedom and a linear fiexural spring in the plunge degree of freedom. By attaching a piezoelectric material （PSI-5A4E） to the plunge degree of freedom, we can convert aeroelastic vibrations to electrical energy. The focus of this study is placed on the effects of the freeplay nonlinearity gap on the behavior of the harvester in terms of cut-in speed and level of harvested power. Although the freeplay nonlinearity may result in subcritical Hopf bifurcations （catastrophic for real aircrafts）, harvesting energy at low wind speeds is beneficial for designing piezoaeroelastic systems. It is demonstrated that increasing the freeplay nonlinearity gap can decrease the cut-in speed through a subcritical instability and gives the possibility to harvest energy at low wind speeds. The results also demonstrate that an optimum value of the load resistance exists, at which the level of the harvested power is maximized.

关键词： energy harvesting freeplay nonlinearity piezoelectric material aeroelasticity experimental measurements

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Development of piezoelectric energy-harvesting tuned mass damper

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中国科学：技术科学英文版 2017年第3期60卷 467-478页

作者： PAN Peng ZHANG DongBin NIE Xin CHEN HaoWen Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry Tsinghua University Beijing 100084 China Department of Civil Engineering Tsinghua University Beijing 100084 China

Tuned mass dampers(TMDs)are one of the most widely used devices to mitigate vibrations in ***,in conventional TMDs,viscous dampers convert the energy of vibration into heat.A new type of TMDs,called regenerative TMDs。

关键词： piezoelectric tuned mass damper regenerative vibration control energy harvesting

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Online Optimal Transmission Scheduling of an energy harvesting Sensor for Remote State Estimation

Online Optimal Transmission Scheduling of an Energy Harvesti...

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第40届中国控制会议

作者： Haoxiang Xiang Chenwei Zhong Jingwen Yang Xi’nan Qiu Hongxia Rao Guangdong Provincial Key Laboratory of Intelligent Decision and Cooperative Control School of Automation Guangdong University of Technology

We investigate an online optimal sensor transmission scheduling problem for remote state estimation. We consider the energy harvesting sensor, which can absorb external energy and use the energy to transmit the local state estimates to the remote estimator over an unreliable wireless channel. Furthermore, we consider that the sensor has two different transmission energy levels, where different energy levels correspond to different data reception ratios. Considering the trade-off between estimation performance and energy consumption, we hope to design an optimal transmission policy that minimizes the convex combination of the estimation error covariance and the energy for data transmission. We formulate the optimization problem as a Markov decision process, which can be solved by dynamic programming. Then, we introduce the concept of submodularity to prove that there is an optimal threshold policy on the error covariance, given sensor battery and collected energy. Eventually, simulations are given to illustrate the aforementioned results.

关键词： Remote estimation energy harvesting sensor scheduling Markov decision process threshold structure

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Investigation on Metasurface for Dual-Band RF energy harvesting Without Mutual Interference

Investigation on Metasurface for Dual-Band RF Energy Harvest...

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2021中国智能自动化大会(CIAC2021)

作者： Daoheng Zhu Zhiqiang Li Dongyang Fu Hua Xiao Xiaokun Yang College of Electronics and Information Engineering Guangdong Ocean University South China Sea Resources Big Data Center of Zhanjiang Bay Laboratory College of Big Data and Information Engineering Guizhou University

A dual-band(2.45 and 12 GHz) and wide-angle MS(short for metasurface) for RF(short for radio frequency) energy harvesting is proposed in this research. This structure can maintain a high efficiency over 90% at 2.45 GHz for electromagnetic wave harvesting as conventional ones, and can operate in another frequency band with efficiency of at least 90%. For verification, a prototype is fabricated and measured in an anechoic chamber. The experimental results corroborate the proposed MS performs well with the efficiency of more than 80% for wide-angle incident waves in all frequency bands. Isolated by a wide band between both resonances points, the MS structure can provide alternative sources to wireless sensor network(WSN) without mutual interference.

关键词： Dual-band Metasurface energy harvesting Mutual interference

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Electromechanical couping and energy harvesting of circular rings

Electromechanical couping and energy harvesting of circular ...

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2011年全国压电和声波理论及器件应用研讨会

作者： Horn-Sen TZOU StrucTronics and Control Lab.Department of Engineering Mechanics School of Aeronautics and Astronautics Zhejiang UniversityHangzhou 310027

＜正＞Ring shell structures,i.e.,gears,stiffeners,motors,structural sensors,etc.,often exhibits oscillatory behaviors during their *** is a crucial challenge to extract vibration energy,which is always wasted,and to convert to useful electric *** this study,the concept of energy harvesting based on a circular ring laminated with piezoelectric

关键词： vibration modal expansion modal frequency energy harvesting

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Designing of Ferrite Rod Antenna for RF energy harvesting using FEKO

Designing of Ferrite Rod Antenna for RF Energy Harvesting us...

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2017Altair技术大会

作者： Shihua Cao Jianqing Li Faculty of Information Technology Macau University of Science and Technology

Structural health monitoring(SHM) is widely used for maintaining and monitoring various structures in different areas. While, the SHM system life span depends on the capability of the batteries, but it can be increased by energy harvesting approaches to autonomously produce power. These autonomously powered SHM systems have received increasing attention over the past decades. A double resonant coil ferrite rod(DRCFR) antenna for RF energy harvesting in medium frequency(MF) band is proposed. Simulation results indicate that the proposed DRCFR antenna can increase the gain by 2.8 dBi and the receiving voltage by 25.77% compared with a conventional single resonant coil ferrite rod(SRCFR) antenna.

关键词： energy harvesting structural health monitoring ambient energy RF double resonant coil ferrite rod antenna

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Power Allocation for energy harvesting-based D2D Communication Underlaying Cellular Network

Power Allocation for Energy Harvesting-based D2D Communicati...

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第36届中国控制会议

作者： Min Zeng Ying Luo Qiumei Guo Hong Jiang School of Information South West University of Science and Technology

ISBN: (纸本)9781538629185

Cellular network with energy harvesting（EH） powered Device-to-Device（D2D） communication can increase cellular network capacity and meanwhile keep a high efficiency of spectrum and *** this paper,we consider a single cellular network,where one pair of D2D user（DU） reuses the uplink channel of a cellular user（CU）,and the D2D transmitter has EH *** order to investigate the optimal power allocation scheme for both CU and DU,we formulate a short-term weighted system rate maximization problem,which has a non-concave ***,the constraints of minimum transmission rate and maximum available power of both CU and DU are also considered in the optimization ***,we convert the non-concave problem to a concave one by introducing a tight lower bound for the original weighted system rate and a transformation *** solving the concave problem,the closed-form expression of optimal power allocation scheme for both CU and DU can be *** the simulation,we evaluate the optimal power allocation scheme,and show the maximal achievable system rate under different EH power and ***,we expose the results on the relationship between system rate and channel distance of CU and DU link,as well as the relationship between system rate and battery size of the D2D transmitter.

关键词： D2D communication Cellular network energy harvesting Power allocation

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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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PIEZOELECTRIC WIND energy harvesting DEVICE WITH RESONANT CAVITY AND TUNING FORK REEDS

PIEZOELECTRIC WIND ENERGY HARVESTING DEVICE WITH RESONANT CA...

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2015全国压电和声波理论及器件技术研讨会

作者： Yong-bin ZHANG Cheng-liang PAN Xue-kui MENG Lian-dong YU School of Instrument Science and Opto-electronics Engineering Hefei University of Technology

energy source and environment protection are universal concerned topics in our *** are a series of problems caused by using traditional batteries for wireless and portable electronic *** this paper,a novel resonant cavity with piezoelectric tuning fork reeds is proposed to scavenge wind energy as a power supplier for remote wireless sensor network *** of the proposed piezoelectric wind energy harvesting device is studied numerically and *** design and working principle of the device are *** mode and frequency of the structure are analyzed with FEA *** abilities of the prototype device are tested under different working *** device shows a violent resonant vibration in anti-phase mode when the wind speed is over 9 m/*** a matching load of 83 kΩ,an output power of 6.3 mW was achieved under the wind speed of 12 m/s.

关键词： energy harvesting Piezoelectric reed Resonant cavity Tuning fork

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