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A low frequency piezoelectric power harvester using a spiral-shaped bimorph

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Science china(Physics,mechanics & Astronomy) 2006年第6期49卷 649-659页

作者： HU Yuantai1,2,HU Hongping2 & yang jiashi3.1. institute of {3. and sensing technology,central south university,changsha 410083.china 2. Department of {3.,Huazhong university of Science and technology,Wuhan 43.074,china 3. Department of Engineering {3.,university of Nebraska,Lincoln,NE 68588-0526,USA 1. institute of mechanics and sensing {3. Central South University Changsha 410083 China 2. Department of mechanics Huazhong University of Science and Technology Wuhan 430074 China 3. Department of Engineering mechanics University of Nebraska Lincoln NE 68588-0526 USA

We propose a spiral-shaped piezoelectric bimorph power harvester operating with coupled flexural and extensional vibration modes for applications to low frequency energy sources. A theoretical analysis is performed and the computational results show that the spiral structure has relatively low operating frequency compared to beam power harvesters of the same size. It is found that to optimize the performance of a piezoelectric spiral-shaped harvester careful design is needed.

关键词： spiral-shaped bimorph,piezoelectric harvester,power density.

ANTI-PLANE DYNAMIC PROBLEMS OF PIEZOELECTRIC CERAMECS AND DEVICE APPLICATIONS

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ANTI-PLANE DYNAMIC PROBLEMS OF PIEZOELECTRIC CERAMECS AND DE...

庆祝中国力学学会成立50周年暨中国力学学会学术大会’2007

作者： CHEN Ziguang~(*,1)) yang jiashi~(*,**) *(institute of {3. and sensing technology,school of civil Engineering and architecture,central south university, changsha {13.china) **(Department of Engineering {3.,university of Nebraska,Lincoln,NE68588-0526,USA)

We present theoretical results from a series of our recent analyses on dynamic problems of anti-plane motions of piezoelectric ceramic plates and *** problems analyzed have various device applications including

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Thickness-shear vibration of a circular cylindrical ceramic cylinder with unattached electrodes and air gaps

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Science china(Physics,mechanics & Astronomy) 2009年第9期52卷 1423-1427页

作者： yang zengtao yang {3. GUO ShaoHua CAO Liang Sichuan institute of Piezoelectric&Acoustooptic technology Chongqing 400060China Department of Engineering mechanics University of NebraskaLincolnNE 68588-0526USA institute of mechanics and sensing {3. School of Civil Engineering and ArchitectureCentral South UniversityChangsha 410083China

We analyze thickness-shear vibration of an axially poled circular cylindrical tube with unattached electrodes and air gaps. Both free and electrically forced vibrations are studied. Exact solutions are obtained from the equations of linear piezoelectricity. Resonant frequencies and the impedance of the transducer are calculated from the solution. Results show that the resonant frequencies are sensitive to the dimensions of the air gaps when the gaps are thin. The impedance depends strongly on the air gaps.

关键词： vibration cylindrical cylinder piezoelectricity air gap

MODELING OF POWER TRANSMISSION THROUGH AN ELASTIC WALL BY PIEZOELECTRIC TRANSDUCERS AND ACOUSTIC WAVES

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MODELING OF POWER TRANSMISSION THROUGH AN ELASTIC WALL BY PI...

第三届全国压电和声波理论及器件技术研讨会

作者： Zeng-tao yang,Shao-hua GUO institute of mechanics and {3. technology,school of civil Engineering and architecture central south university,changsha,Hunan 410083.china Yuan-tai HU Department of mechanics,Huazhong {13. of Science and technology,Wuhan,Hubei 43.074,china Jia-shi yang Department of Engineering mechanics,{13. of Nebraska,Lincoln,NE 68588-0526,USA

We present our recent modeling results on power transmission through an elastic wall by piezoelectric transducers and acoustic waves,This includes the case of finite piezoelectric transducers on plates,power transmiss... 详细信息

关键词： Piezoelectricity transducer acoustic waves

ELECTRICALLY FORCED VIBRATION OF A THICKNESS-TWIST MODE PIEZOELECTRIC RESONATOR WITH NON-UNIFORM ELECTRODES

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Acta Mechanica Solida Sinica 2007年第3期20卷 266-274页

作者： yang jiashi Chen Ziguang Hu Hongping Key Laboratory for Advanced Materials and Rheological Properties of Ministry of Education Xiangtan University Xiangtan 411105 China Department of Engineering mechanics University of Nebraska Lincoln NE 68588-0526 USA institute of mechanics and sensing {3. School of Civil Engineering and Architecture Central South University Changsha 410083 China Department of mechanics University of Huazhong University of Science and Technology Wuhan 430074 China

We study the effect of electrodes with varying thickness on thickness-twist vibration of a piezoelectric plate resonator of crystals of 6 mm symmetry. An exact theoretical analysis is performed. Results show that non-uniform electrodes have a strong effect on mode shapes, and suggest the possibility of using nonuniform electrodes for strong energy trapping.

关键词： energy trapping thickness-twist mode non-uniform electrodes resonator

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新型光纤光栅加速度传感器动态特性的研究

武汉理工大学学报 2008年第12期30卷 117-120页

作者：厉善元蒋冬青梁磊南华大学机械工程学院衡阳421001 湖南工学院衡阳421002 武汉理工大学光纤传感技术研究中心武汉430070

以大型桥梁和建筑结构的健康监测为背景,设计了一种新型的低频高灵敏度光纤光栅加速度传感器,并利用有限元法对该传感器进行了优化设计和动态特性分析,结果表明:该新型光纤光栅加速度传感器具有灵敏度高、横向灵敏度小、测量精度高和动... 详细信息

以大型桥梁和建筑结构的健康监测为背景,设计了一种新型的低频高灵敏度光纤光栅加速度传感器,并利用有限元法对该传感器进行了优化设计和动态特性分析,结果表明:该新型光纤光栅加速度传感器具有灵敏度高、横向灵敏度小、测量精度高和动态特性较佳等特点。

关键词：光纤传感光纤布喇格光栅加速度传感器有限元法

AN EXACT ANALYSIS OF FORCED THICKNESS-TWIST VIBRATIONS OF MULTI-LAYERED PIEZOELECTRIC PLATES

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Acta Mechanica Solida Sinica 2007年第3期20卷 211-218页

作者： Hu Hongping Chen Ziguang yang jiashi Hu Yuantai Department of mechanics School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan 430074 China institute of mechanics and sensing {3. School of Civil Engineering and Architecture Central South University Changsha 410082 China Department of Engineering mechanics University of Nebraska Lincoln NE 68588 USA

This paper deals with the thickness-twist vibration of a multi-layered rectangular piezoelectric plate of crystals of 6 mm symmetry or polarized ceramics. An exact solution is obtained from the three-dimensional equations of linear piezoelectricity. The solution is useful to the understanding and design of composite piezoelectric devices. A piezoelectric resonator, a piezoelectric transformer, and a piezoelectric generator are analyzed as examples.

关键词： piezoelectricity plate resonator transformer generator

THE CHARACTERISTIC OF THE ACCELERATING ENERGY RELEASE（AER） AS THE PRECURSOR TO FAILURE OF ROCK SPECIMENS UNDER DIFFERENT LOADING CONDITIONS

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THE CHARACTERISTIC OF THE ACCELERATING ENERGY RELEASE（AER）...

The 7th International Conference on Shock and Impact Loads on Structures

作者： Guoxiang Wan~* central south university {3. Xibing Li central south university {3. Fengqiang Gong central south university {3. Zhouyuan Ye central south university {3. Qisheng Wang central south university {3.

＜正＞The experiments of uniaxial compression and impact of rock specimens were made on Instron13.2 and SHPB test systems *** exponent z-values of the accelerating energy release（AER） as one kind of macroscopic failure precursors of rock specimens are obtained by fitting with the experimental data using the theory of *** z-values are less than 1 both under static load and impact,which indicates that elastic strain energy does accelerate to release before rock *** z-values of the AER of rock under impact are larger than conventional value of rock under static *** exponent z is the focus of the problem,which characterizes the degree of the *** z-values under static load with impact,the degree of AER of rock specimens under static load is more fiercely than under *** theory of AER is first used to analyze the strain energy of rock failure under impact. The work furthers to develop the theory of the AER.

关键词： static load impact accelerating energy release(AER)

INVESTIGATION OF LANGANITE AND LANGATATE SINGLE CRYSALS FOR HIGH TEMPERATURE sensing

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INVESTIGATION OF LANGANITE AND LANGATATE SINGLE CRYSALS FOR ...

2010全国压电和声波理论及器件技术研讨会

作者： Fa-peng YU~(1,2),Duo-rong YUAN~(1,*),Xian ZHAO~1,Shu-jun ZHANG~(2,*) 1 State Key Lab.of Crystal Materials and institute of Crystal Materials,Shandong university, 27 Shanda south Road,Jinan,250100,{3. 2 Materials Research institute,Pennsylvania State university, university Park,PA,16802,USA

LaGaNbO（LGN） and LaGaTaO（LGT） with trigonal 3. symmetry were grown by Czochralski （CZ） *** Resolution X-Ray Diffraction（HRXRD） measurement was carried out on the as-grown LGN and LGT crystals for crystal quality *** temperature dependent behaviors were investigated to explore the zero temperature coefficient of frequency（TCF） cuts at elevated temperature. Among the investigated crystal cuts,（XYt）9 cuts with length extensional vibration mode（LEM） were found to possess high turnover temperature around 250℃,for LGN and LGT ***,LGN（YX1）15°and LGT（YX1）20°crystal cuts,taking advantage of thickness shear vibration mode（TSM）,were found to exhibit strong frequency stability in the temperature range of 20～400℃,with turnover temperatures at 280℃and 180℃,*** high electromechanical coupling factor k（>10%）,high mechanical quality factor Q（>4000）,together with the zero TCF characteristics at elevated temperature,indicating LGN and LGT crystals potential for high temperature（100～400℃） sensing applications.

关键词： Zero TCF sensor piezoelectric single crystals langatate langanite