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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

引用

固体力学学报 2009年第6期 649-650页

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GROWTH HABITS AND HIGH TEMPERATURE PROPERTIES OF LANGATATE SINGLE CRYSTAL

GROWTH HABITS AND HIGH TEMPERATURE PROPERTIES OF LANGATATE S...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Xiao-niu TU Yan-qing ZHENG Hai-kuan KONG Yi-fan TU Kai-nan XIONG Er-wei SHI Shanghai Institute of Ceramics Chinese Academy of Sciences

This paper shows that high quality LGT single crystals with the size of 2" were grown by Czochralski method along different *** facets and the solid-liquid interface during crystal growth process were investigated,and flat interface was obtained by adjusting the rotation rate.X-cut wafers were used to test frequency constant,resistivity,piezoelectric constant and crystalline *** results indicate that frequency constant value was around 2.77MHz-mm with a vitiation of 0.2% along the whole crystal;the resistivity of top part and bottom part both higher than 10～7Ohm·cm at 500 ℃;piezoelectric coefficient(d) was 7.0 pC/N;diffraction angle is 22.3228° and the Ml width at half maximum（fwhm） value is 33.5 *** all,the LGT crystal was in high quality and high homogeneous,can be used to high temperature acoustic wave devices and sensors in applications.

关键词： Langatate SPAWDA High temperature Resistivity Frequency

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DESIGN OF TEMPERATURE SENSOR ARRAY IN SMART ELECTRIC GRID BASED ON SAW RESONATORS

DESIGN OF TEMPERATURE SENSOR ARRAY IN SMART ELECTRIC GRID BA...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Yu-lin HAN Zhen LI Zhen-wei QI Yue HU Bo-quan LIU Tao HAN Ji WANG School of Electronic Information and Electrical Engineering Shanghai Jiaotong University XJ Group Corporation Piezoelectric Device Laboratory Ningbo University

The sensor array with six sensors working at the frequency range of 429-436 MHz is designed and *** temperature sensitivity can be accurately controlled by the metallization thickness of the resonator on quartz substrate to keep the temperature-induced frequency shifts of each sensor within a limited bandwidth over a wide operating temperature ranging from-40℃ to +150℃.The thermal parameters of sensor encapsulation are optimized according to the high voltage switchgear *** order to meet the real-time requirement of sensor array measurement,discrete Hartley Transform(DHT) and the method of fast searching center frequency of sensors by comparison of I/Q and interrogation signals are used to reduce the query time,greatly improving the efficiency of polling of the sensor *** measurement uncertainty of the practical SAW temperature sensor is less than 1 ℃,and the sensitivity of sensor is up to 4KHz/℃.

关键词： SAW Smart electric grid Temperature Sensor array

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FINITE DIFFERENCE TIME DOMAIN ANALYSIS OF TWO-DIMENSIONAL PIEZOELECTRIC PHONONIC CRYSTALS

FINITE DIFFERENCE TIME DOMAIN ANALYSIS OF TWO-DIMENSIONAL PI...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Yi-yu ZHAO Hong-lang LI Wei LUO Jiang-bo WEI Yong LIANG Shi-tang HE Acoustic Micro-electric Mechanical system Institute of acousticsChinese academy of sciences Dept.of Electronic Science & Technology Huazhong University of Science & Technology School of Optoelectronics Beijing Institute of Technology

Phonemic crystals（PCs） have promising band gaps,in which Surface Acoustic Wave（SAW） propagating is *** numerical methods have already been developed and applied to analyze piezoelectric PCs,most of them have various disadvantages,as they cannot calculate the transmission characteristic of the limited structure or cannot provide the propagation process for SAW in time *** finite-difference time-domain（FDTD） technique solving these problems is adopted to analyze the piezoelectric characteristics of *** in the PCs is studies by experience with direct generation and detection of SAW using interdigital transducers（IDT's）.The simukticin data agrees with the measurement *** the FDTD method is an effective method of simulating piezoelectric PCs structure in which a square array of parallel cylindrical aluminum placed on a 128° YX LiNbO substrate.

关键词： Piezoelectric PCs FDTD SAW IDT's

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STUDY ON THE VIBRATION COUPLING OF ULTRASONIC MOTOR USING LONGITUDINAL TRANSDUCERS

STUDY ON THE VIBRATION COUPLING OF ULTRASONIC MOTOR USING LO...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Ying-xiang LIU Wei-shan CHEN Di LU Xiao-hui YANG Yu YAO State Key Laboratory of Robotics and System Harbin Institute of Technology School of Astronautics Harbin Institute of Technology

A linear ultrasonic motor using longitudinal vibration transducers with single foot was proposed,designed,fabricated and tested in a previous *** longitudinal vibrations of two orthogonal bolt-clamped transducers are superimposed to produce eUiptical movements on the driving ***,the operating principle of the proposed motor is *** longitudinal and bending vibrations of the transducers are gained by modal ***,the resonance frequencies and input impendence characteristics of the individual transducers and the motor are calculated respectively to gain the effect from the vibration *** study results state that the vibration coupling between the transducers make thenlongitudinal resonance frequencies have small increases and the electromechanical coupling factor of the vertical transducer has an obvious decrease after it is linked with the horizontal *** last,the coupling bending vibrations of the transducers are tested by using a scanning laser Doppler vibrometer.

关键词： Ultrasonic motor Longitudinal transducer Vibration coupling Input impendence

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A NOVEL APPROACH TO SIMULATE LOW-LOSS SURFACE ACOUSTIC WAVE DEVICES USING DISPERSIVE COM PARAMETERS

A NOVEL APPROACH TO SIMULATE LOW-LOSS SURFACE ACOUSTIC WAVE ...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Hao WANG Wei-biao WANG Bo SU Jian WANG Hao-dong WU Yong-an SHUI Key Laboratory of Modem Acoustics(MoE) Institute of AcousticsNanjing University The 55th Research Institute of China Electronic Technology Group Corporation School of Electronic Science and Engineering Nanjing University

This paper describes a novel approach to extract dispersive coupling-of-modes(COM) parameters for simulating low-loss surfece acoustic wave(SAW) devices.A finite periodic grating is in *** finite FEM/BEM tool,the field(mechanical displacements and electric potential) distributions could be calculated at every *** the field contributed by SAW should be separated from the total field by Source Regeneration *** both short-circuited and open-circuited gratings,all the dispersive COM parameters can be *** particular,the dispersive reflection coefficient and propagation velocity are obtained *** an example,a synchronous one-port resonator is simulated using dispersive COM parameters extracted by the method mentioned in this *** electrical property of the resonator agrees well with the result simulated by finite FEM/BEM,which verifies this approach is accurate and effective.

关键词： Surface acoustic wave Low-loss devices Coupling-of-modes model Dispersive COM parameters

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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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MINDLIN PLATE EQUATIONS FORTHE THICKNESS-SHEAR VIBRATIONS OF CIRCULAR ELASTIC PLATES

MINDLIN PLATE EQUATIONS FORTHE THICKNESS-SHEAR VIBRATIONS OF...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Wen-jun WANG Ji WANG Gui-jia CHEN Ting-feng MA Jian-ke DU Piezoelectric Device Laboratory School of Mechanical Engineering &Mechanics Ningbo University

The systematic derivation of Mindlin plate equations has been fully presented in the monograph of Mindlin and some of his *** applications followed are focused on the straight-crested wave in rectangular quartz crystal plates due to the necessity in the design of rectangular type resonators and relative simplicity of *** applications concerning circulate plates vibrating at the thickness-shear mode or the shear effects are analyzed by transforming the relatively simple equations of the thickness-shear and flexural modes to the cylindrical coordinates with a simple procedure,as we can find from a few papers and *** systematic derivation by following a rigorous procedure of Mindlin plate equations are not presented before,and subsequent applications to coupled vibrations of circular plates at thickness-shear modes have not be studied with the Mindlin plate equations for circular type quartz crystal ***,vibrations of overtone modes with more coupled displacements require a systematic derivation which is more clear with the cylindrical coordinates.

关键词： Elastic plates Mindlin plate theory Vibration Circular plates

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EXACT ANALYSIS OF THE DYNAMIC PROPERTIES OF 2-2 CEMENT BASED PIEZOELECTRIC ACTUATOR CONSIDERING POLING LAYER EFFECT

EXACT ANALYSIS OF THE DYNAMIC PROPERTIES OF 2-2 CEMENT BASED...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Tao-tao ZHANG Kun MA Zhi-fei SHI School of Transportation Science and Engineering Beihang University School of Civil Engineering Beijing Jiaotong University

Cement based piezoelectric composites can have not only low frequency,but also good compatibility with the concrete,which is perfect for measuring the properties of the civil engineering ***,up till now there have been only a few literatures dealing with the theoretical analysis of cement based piezoelectric composite,especially for the 2-2,0-3 and 1-3 cement based *** on the general theory of elasticity and the dynamic theory of piezoelectricity,the dynamic behavior of 2-2 cement-based piezoelectric actuator is investigated under the harmonic electric *** actuator consists of 2 cement layers and 1 piezoelectric *** the poling layers between the cement layer and the piezoelectric layer as the elastic layer,the exact solutions of the mechanical and electrical fields of the actuator are obtained by utilizing Airy stress function ***,the curves of displacement or stress along axial direction and other conclusions are given and ***,it can be seen that the analytical model estabhshed in this paper works very well,which could benefit the design of this kind of cement-based smart devices.

关键词： 2-2 cement based Piezoelectricity Dynamic Exact solutions Actuator

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PIEZOELECTRIC BEAM WITH NON-UNIFORM THICKNESS FOR VIBRATION ENERGY HARVESTING

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

引用

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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