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检索条件"任意字段=2012全国压电和声波理论及器件技术研讨会"

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STRUCTURAL DYNAMICS DESIGN OF AXIAL/RADIAL COUPLING NON-CONTACT PIEZOELETRIC ULTRASONIC MOTOR WITH A SPHERICAL ROTOR

STRUCTURAL DYNAMICS DESIGN OF AXIAL/RADIAL COUPLING NON-CONT...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Jun-shan WANG Chao CHEN Geng-chao CHEN Xiao-jun YAN State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics & Astronautics Beijing Aerospace Control Device Institute

In this paper,an axial/radial coupling spherical rotor non-contact piezoelectric actuator is presented,the actuator consists of an axial suspension device and a radial suspension device,and traveling waves can be formed under the incentive specific conditions,which apply suspension force and driving force for the spherical *** the axial device structure and constraints in order to optimize its suspension and drive effect for the spherical rotor,the finite element model of the axial / radial suspension device is built and dynamics analysis and design are done on the two parts *** a sound and solid coupling model to acquire the kinetic mechanism of suspension and drive force,and acquired the relationship between sound pressure distribution and vibration amplitude as well as the relationship between the suspended mass and the *** this basis determined the structure and manufactured a prototype and tested the radial stator vibration parameters to provide a basis for further optimization.

关键词： Suspension Coupling Acoustic radiation pressure Spherical rotor

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PIEZOELECTRIC BEAM WITH NON-UNIFORM THICKNESS FOR VIBRATION ENERGY HARVESTING

PIEZOELECTRIC BEAM WITH NON-UNIFORM THICKNESS FOR VIBRATION ...

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2012全国压电和声波理论及器件技术研讨会

作者： Song-mao CHEN Jin-juan ZHOU Jing SUN Jun-hui HU State Key Lab of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics

This paper presents the design,test and analysis of a thickness non-uniform piezoelectric beam for impact vibration energy *** piezoelectric beam has three evenly spaced rectangular grooves of identical size,and three identical rectangular piezoelectric *** piezoelectric patch has the same central position as its corresponding groove,and the three piezoelectric patches are connected in parallel *** show that the maximum output power is approximately 48.5 μW at the excitation frequency of 15.1 Hz and acceleration of 1 g(rms),and under the constant excitation acceleration of lg(rms),the working bandwidth is found to be around 5 Hz in which the maximum output power is 263.9 μ*** are made to conventional uniform piezoelectric beam both experimentally and *** is found that the proposed non-uniform piezoelectric beam has much better energy harvesting capability than conventional uniform one.

关键词： Vibration energy harvesting Non-uniform thickncss Piezoelectric Impact Finite element method

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“2009年全国压电和声波理论及器件技术研讨会暨2009年全国频率控制技术年会”纪要

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固体力学学报 2009年第6期 649-650页

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NUMERICAL SIMULATION INVESTIGATION ON PARAMETERS INFLUENCING SYNTHETIC-JET FOR ACTIVE FLOW CONTROL

NUMERICAL SIMULATION INVESTIGATION ON PARAMETERS INFLUENCING...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Dang-guo YANG Jun LIU Yi ZHANG Jin-min LIANG Yao-hua LI State Key Laboratory of Aerodynamics China Aerodynamics Research and Development Center High Speed Aerodynamics Research Institute China Aerodynamics Research and Development Center School of Aerospace Tsinghua University

Synthetic-Jet(SJ) technology is a novel method for flow control in aerodynamic design of *** development of science and technology,flow control method based on SJ technology makes significant progress,and it is very ***,Synthetic-Jet actuator(SJA) has advantages of light weight,simple structure,no need for external air *** incessant requirements for high performances of spacecrafts,the application of active flow control technology,especially SJ technology,turns into one of the hottest research *** this paper,based on two-dimensional structured moving grids algorithm and multi-block grid technology,numerical simulation investigation about the effects of parameters on the performances of SJA is *** research results indicate that the maximum jet velocity increases as the SJA vibration frequency and amplitude increase,and decreases as the orifice diameter *** orifice thickness has little influence on the maximum jet *** flow presents turbulent characteristics at high Reynolds number(Re),and the increase of Re makes diameter of vortex core and attenuation speed greater,the increase of Strouhal number(St) makes diameter of vortex core *** a word,the paper presents effects of different physical parameters,such as operating parameters,orifice parameters,Re,St,and so on,on flow characteristics of *** results may provide technical support for the design and application of SJA.

关键词： Synthetic-Jet Active flow control Structured moving grids Parameters Numerical simulation

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PRESSURE-INDUCED ENHANCEMENT OF PIEZOELECTRICITY OF QUARTZ-LIKE SINGLE CRYSTALS

PRESSURE-INDUCED ENHANCEMENT OF PIEZOELECTRICITY OF QUARTZ-L...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Kai-nan XIONG Su-xian CUI Yan-qing ZHENG Er-wei SHI Shanghai Institute of Ceramics Chinese Academy of Sciences University of Chinese Academy of Sciences

The piezoelectricity of same material is often affected by its form（such as bulk single crystals,low dimension materials,extension thin film and so on）,pressure,stress and *** this paper,by first-principles calculation,the piezoelectricity of quartz-like crystals（synthetic quartz,AlPO,GaPO,GaAsO and GeO） was investigated with virtual isostatic *** virtual negative pressure makes its structure close to high temperature quartz phase with a higher symmetry,which lead to first-order phase transition and normal piezoelectric strain coefficient along a-axis disappearing *** piezoelectricity is related closely with tetrahedral tilt angle which is used for characterizing the degree to divergence of *** stress or other non-isostatic pressing can also lead to this kind of increasing or declining,which is a general *** a specific type of structure,piezoelectric coefficient can be represented as a simple function of pressure or order ***,the contribution of piezoelectric effect can be divided into two parts,clamping ion and internal strain *** the internal strain is divided to each cell to get microscopic piezoelectric coefficient of every ions and oxygen *** compared variation of tetrahedral tilt angle and microscopic piezoelectric coefficient of these five kinds of crystals,we get an explanation of the relationship between structure parameters and piezoelectric effect of quartz-like crystals in microcosmic level.

关键词： Quartz First-principles Piezoelectricity

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TEMPERATURE DEPENDENCE OF ELECTRO-ELASTIC PROPERTIES OF YTTRIUM CALCIUM OXYBORATE SINGLE CRYSTLALS

TEMPERATURE DEPENDENCE OF ELECTRO-ELASTIC PROPERTIES OF YTTR...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Fa-peng YU Xiu-lan DUAN Shu-jun ZHANG Yong-gui YU Ting-feng MA Xian Zhao State Key Laboratory of Crystal Materials and Institute of Crystal Materials Shandong University Materials Research Institute Pennsylvania State UniversityUniversity ParkPA 16802USA Piezoelectric Device Laboratory School of EngineeringNingbo University

High temperature piezoelectric crystals,YCaO（BO）（YCOB） possess relatively high piezoelectric activities(d =.8pC/N,k= 9%) and no phase transition prior to the melting point（500℃）,indicating the potential use for high temperature *** this work,growth of YCOB single crystals by using Czochralski（Cz） method was introduced and the temperature dependence of electro-elastic properties was investigated from 20 to 950℃,where the resonance frequencies relating to elastic compliances s and s,were found to shift linearly with increasing temperature,with relatively large first order temperature coefficient being on the order of-94ppm/℃.Of particular significance is that the lateral mode of（XY） and（XZ） crystal cuts were found not only possess relatively high electromechanical coupling factor(k= 5%) and piezoelectric coefficient(d = pC/N),but also the temperature independence of electromechanical properties,demonstrating YCOB a good candidate for high temperature piezoelectric sensing.

关键词： YCOB crystals Piezoelectric properties Temperature dependence High temperature sensors

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INFLUENCE OF BARIUM CONTENT ON THE PROPERTIES AND STRUCTURE OF LOW TEMPERATURE SINTERED BCZT LEAD-FREE PIEZOELECTRIC CERAMICS

INFLUENCE OF BARIUM CONTENT ON THE PROPERTIES AND STRUCTURE ...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Chun-hua GAO Xin-you HUANG Zhi-wen ZHU School of Materials Science and Engineering Jiangsu University

The influence of barium content on dielectric and piezoelectric properties of low temperature sintered(BaCa(ZrTi)O doped with 0.2wt.%LiCO（BCZT-0.2Li） lead-free piezoelectric ceramics was studied by scanning electron microscope（SEM） and X-ray diffraction（XRD） and other analytical methods and conventional solid state ***2 was chemically pure raw materials,other raw materials were analytical pure raw *** results showed that with the increasing of the content of barium,the grain size of BCZT-0.2Li ceramics decreased gradually,the diffraction peaks of perovskite structure was obvious,there was miscellaneous *** the increasing of the content of barium,the planar electromechanical coupling coefficient（k） and the piezoelectric strain constant(d) and the thickness electromechanical coupling coefficient（k_t） and the dielectric constant（ε） of low temperature sintered BCZT-0.2 Li ceramics all increased first and then decreased,dielectric loss（tanδ） of low temperature sintered BCZT ceramics decreased first and then *** the content of barium was 0.85 mol,the properties of low temperature sintered BCZT-0.2Li ceramics was optimum,which k was 0.42,d was 87 pC/N,k_t was 0.046,tan 5 was 0.013,εwas 2020,the sintered temperature was 1050℃.

关键词： Lead-free piezoelectric ceramics Barium calcium zirconate and titanate Low temperature sintered Barium content

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STUDY ON SIGNAL CRYSTAL PHOTO-ELASTIC MODULATOR BASED ON LITHIUM NIOBATE PIEZOELECTRIC AND PHOTO-ELASTIC EFFECT

STUDY ON SIGNAL CRYSTAL PHOTO-ELASTIC MODULATOR BASED ON LIT...

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2012全国压电和声波理论及器件技术研讨会

作者： Dong-e ZHAO You-hua CHEN Zhi-bin WANG Yuan-yuan CHEN Li-fu WANG Rui ZHANG Key Laboratory of Instrumentation Science and Dynamic Measurement North University of China Engineering Technology Research Center of Shanxi Province for Opto-Electronic Information and Instrument North University of China

In order to overcome the disadvantage of Kemp-type photo-elastic modulator such as low modulation efficiency,strict match size,bulky et al.,we proposed a photo-elastic modulate mode which use LiNbO crystal piezoelectric properties to produce the effect of the *** to the theory of piezoelectric vibration and Crystal optics principle,we analyzed the crystal orientation dependence of physical properties,and derived the relations of displacement and retardation amplitudes over voltage amphtude,then,the cut-type and the optical path was been *** device was designed with dimensions 41 mm×7.7 mm×17.1 mm in x-,y- and z-direction,0°cutting angle（x-cut）,z-axis for the optical path and electrodes on the xz-surfaces offers basic modulation frequencies at 73.71 kHz corresponding to the longitudinal oscillations in x- ***,the correlation experimental equipment was built for the experimental verification;the result shows that:the voltage amplitude to achieve a half-wave retardation amphtude is only .6 V for 633 nm wavelength,the modulation voltage reduced times Compared with the LiTaO3 signal crystal photo-elastic modulator whose cutting-type didnt been *** SCPEM will have larger dynamic modulation range and lower modulation power dissipation;in addition,the light damage threshold of this SCPEM will be high,and modulation frequency can be further improved till hundreds of kHz or several *** has important application prospect in the field of super-laser pulse modulation,super-speed interference modulation and so on.

关键词： Lithium Niobate Piezoelectric Effect Cutting-Type Single crystal Photo-elastic modulator

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INFLUENCE OF Co2O3 DOPED AMOUNT ON THE PROPERTIES OF(Ba0.85Ca0.15)(Zr0.1Ti0.9)O3 LEAD-FREE PIEZOELECTRIC CERAMICS

INFLUENCE OF Co2O3 DOPED AMOUNT ON THE PROPERTIES OF(Ba0.85C...

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2012全国压电和声波理论及器件技术研讨会

作者： Xin-you HUANG Chun-hua GAO Zhi-wen ZHU Li PAN Zhi-gang CHEN School of Materials Science and Engineering Jiangsu University

The influence of CoO doped amount on dielectric and piezoelectric properties of(BaCa)(ZrTi)O（BCZT）lead-free piezoelectric ceramics was studied by scanning electron microscope（SEM） and X-ray diflraction（XRD） and other analytical methods and conventional solid state *** was chemically pure raw materials,other raw materials were analytical pure raw *** results showed that Perovskite structure of BCZT lead-free piezoelectric ceramics did not change when doped with CoO,the intensity of diffraction peaks of BCZT increased first and then decreased,the grain crystal size of ceramics increased first and then decreased,the density of ceramics increased first and then decreased when CoO doped amount *** microstructure of ceramics was the best when CoO doped amount was 0.40 wt.%.This was also reason for the good piezoelectric *** piezoelectric properties(d,kp,k_t) of BCZT lead-free piezoelectric ceramics increased first and then decreased,the relative dielectric constant（ε） decreased,dielectric loss increased first and then decreased when CoO doped amount *** comprehensive performance of BCZT lead-free piezoelectric ceramics was optimum when CoO doped amount was 0.40 wt.%which piezoelectric strain constant(d) was 171pC/N,relative dielectric constant（ε） was 22400,planar electromechanical coupling coefEcient（k）was 0.478,dielectric loss was 0.018,electromechanical coupling coefficient of thickness（k_t） was 0.041,sintered temperature was 1340℃.

关键词： Lead-free piezoelectric ceramics Barium calcium zirconate and titanate Co2O3 Doped modification

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CALIBRATION OF A THERMAL MEMS SHEAR STRESS SENSOR ARRAY

CALIBRATION OF A THERMAL MEMS SHEAR STRESS SENSOR ARRAY

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2012全国压电和声波理论及器件技术研讨会

作者： Jin-min LIANG Dang-guo YANG Jian-qiang LI Wei-min JIANG Chun-yang LI State Key Laboratory of Aerodynamics China Aerodynamics Research and Development Center High Speed Aerodynamics Research Institute China Aerodynamics Research and Development Center

Accurate measurement of wall shear stress is very important for understanding wall bounded shear flows properly,because it provides significant information about the flow phenomena,including viscous drag,the position where the flow transits to turbulence or separates from the *** measurement of shear stresses based on traditional fabrication technology are much too bulky to accomplish the task perfectly and may destroy the research matrix surface and most likely impossible to be used in any large-scale *** conflict between sensor size and sensitivity is the maximal impedance to the *** making the sensor smaller flexible with high time resolution can bring the boundary layer research to a new *** way of achieving these requirements is micro-fabricated *** paper presents that by taking advantage of MEMS fabrication techniques,sensors can response very quickly to the fluctuations in the flow and do not destroy the model ***,combining an integrating technology,plenty of sensors can be integrated to a membrane for measuring the wall shear stress in larger area *** characterization of a MEMS based thermal shear stress sensor array for high speed flow is presented in this *** static responses for different overheat ratios were obtained via a fully developed duct flow with Ma number 0.1-0.6,and the influence of temperature to the sensor output voltage was measured using a heater with four resistance coils which is able to change the flow temperature of the test section from 289-313 *** relationship between the output voltage and shear stress at overheat ratio of 1.2 is *** to that above,calibration methods is very key technique for application of MEMS sensors on flow measurement in high speed wind ***,the method can provide useful help for application and development of MEMS sensors.

关键词： MEMS Shear stress sensor Calibration Flow measurement High-speed wind tunnel

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