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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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THE MEASUREMENT OF ELASTIC CONSTANTS OF QUARTZ CRYSTAL BY RESONANT ULTRASOUND SPECTROSCOPY

THE MEASUREMENT OF ELASTIC CONSTANTS OF QUARTZ CRYSTAL BY RE...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Zhen WANG Ji WANG Xiang-wu XU Jian-ke DU Ting-feng MA Piezoelectric Device Laboratory School of Mechanical Engineering & MechanicsNingbo University

The mechanical resonant response of a solid depends on its shape,density,and elastic *** describe here the instrumentation and computational methods for obtaining and analyzing the resonant frequency of very small(0.001 cm3)samples,and provide examples to demonstrate the utilization of the technique.A new material type with six independent elastic constants are formulated and tested with the *** study will leads to expansion of the software capability for the testing of novel materials.

关键词： Elastic constants Resonant Ultrasound Spectroscopy Quartz crystal Levenberg-Marquardt method

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SH-SAW PROPAGATION IN A PIEZOELECTRIC STRUCTURE WITH VISCOELASTIC LAYER

SH-SAW PROPAGATION IN A PIEZOELECTRIC STRUCTURE WITH VISCOEL...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Jing CUI Jian-ke DU Ting-feng MA Ji WANG Department of Engineering Mechanics Ningbo University

An analytical approach is taken to investigate shear horizontal surface acoustic wave propagation in viscoelastic/piezoelectric structure,where a viscoelastic material thin layer is bonded to a semi-infinite piezoelectric *** analytical solution of dispersion relations are obtained for electrically open and shorted boundary *** phase velocity,displacement and stresses are calculated and discussed in *** effect of the viscous coefficient on the properties of the SH-SAW are figured and presented.

关键词： Shear horizontal waves Piezoelectric Viscoelastic Attenuation

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STUDYING THE TRANSDUCER WITH PMMA/ALUMINIUM COMPOSITE HEAD BY FINITE ELEMENT METHOD

STUDYING THE TRANSDUCER WITH PMMA/ALUMINIUM COMPOSITE HEAD B...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Hui-sheng LIU Xi-ping MO Institute of Acoustics Chinese Academy of Sciences University of the Chinese Academy of Sciences

In order to enhance the quality of underwater acoustic communication,it is often used matching layer technique to improve the bandwidth performance of the transducer,But it is not easy to find the appropriate matching layer material because of no suitable material in nature,most of which is got by artificial synthesis and keeping it with an acoustic uniformity is also a painful *** approach is given by Using PMMA/Aluminum(Al)composites head to improve the transmitting performance of the *** the finite element method,two types of the PMMA/Al composite head Langevin transducers are studied,including the vibration modes of the transducers in air and the transmitting voltage response of the transducers in water Influenced by the change of the geometry and material parameters of the composite *** finite element results show that the transducer bandwidth is significantly increased by using the new structure of the radiation head.

关键词： Transducer Broadband Matching layer PMMA

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STUDY ON A NEW LINEAR ULTRASONIC MOTOR WITH BENDING PZT ELEMENTS

STUDY ON A NEW LINEAR ULTRASONIC MOTOR WITH BENDING PZT ELEM...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Xiao-hui YANG Wei-shan CHEN Ying-xiang LIU Jun-kao LIU State Key Laboratory of Robotics and System Harbin Institute of Technology

A new linear ultrasonic motor using the 1st longitudinal and the 4th bending vibration modes of a bolt-clamped type transducer has been proposed and *** new motor with two feet employed only the bending PZT *** groups of PZT elements are clamped between the two exponential shape horns and the flange *** driving feet are located in the same side of the *** working principle of the proposed motor are *** the fabrication of a prototype,its admittance characteristics are measured using an impedance analyzer and the vibration modes are tested by a scanning laser Doppler ***,the mechanical ability of the prototype is tested.

关键词： Ultrasonic motor Bending PZT elements Admittance Vibration characteristics

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MECHANISM ON ENERGY TRANSMISSION CONTROL IN BEAMS BASED ON A PIEZOELECTRIC TRANSDUCER

MECHANISM ON ENERGY TRANSMISSION CONTROL IN BEAMS BASED ON A...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Tian-zhu XU Zhen-yu HUANG Hai-li LIU Department of Instrument Science and Engineering Shanghai Jiao Tong University

In a beam-like structure,which acts as a vibration transmission path,transmitted energy can be effectively suppressed by employing an active *** energy transmission control can also be achieved at a certain frequency band without external energy by attaching a mechanical system,which may be composed with piezoelectric transducers,on the beam.A mass-spring attachment is modeled to investigate the relationship between the mechanical impedance and the working ***,the relationship between the working bandwidth and circuit parameters of the piezoelectric transducer is developed to show the feasibility of adjusting the working bandwidth.A case study of a passive system called as dog-bone structure was carried out to show that control range can be expanded by changing the dimension of the *** addition,the piezoelectric constant and capacity also determine the control performance.

关键词： Energy transmission Piezoelectric transducer Vibration control Wave theory

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STUDY ON A HIGH SENSITIVITY TANGENTIAL POLARIZED ACOUSTIC-PRESSURE HYDROPHONE

STUDY ON A HIGH SENSITIVITY TANGENTIAL POLARIZED ACOUSTIC-PR...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Hu ZHANG Qi LI Hong-juan CHEN Wen-zhi WANG Science and Technology on Underwater Acoustic Laboratory Harbin Engineering University

In this paper,the cylindrical PZT acoustic-pressure hydrophone has been *** on the analysis of cylindrical piezoelectric ceramic pipe free vibration and statically receiver theory,the sensitivity of hydrophones covered with plate,whose have three different polarization models,can be *** comparison,the tangential polarized ceramic pipe has the relatively high sensitivity,and at the same time,the hydrophone sample has been fabricated based on the finite element *** experimental results show that the working frequency band of hydrophone sample is 30 Hz-40 kHz,the average acoustic pressure sensitivity is about-182 dB within 30 Hz-10 *** are some difference in resonance frequency and the sensitivity between the result of simulation and test because of the simplification of structure in simulation.

关键词： High sensitivity Pressure hydrophone Tangential polarization

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LARGE TIME-BANDWIDTH PRODUCT ULTRASOUND GENERATION BY DRIVING PIEZOELECTRIC TRANSDUCER

LARGE TIME-BANDWIDTH PRODUCT ULTRASOUND GENERATION BY DRIVIN...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Han ZHANG Xiao-min WANG Jie MAO Ming-xuan LI Guo-xuan LIAN Zhi-wu AN Institute of Acoustics Chinese Academy of Sciences

Based on the Mason equivalent circuit,a theoretical model of ultrasonic signal generated by controlling the excitation signal has been *** TBWP(time-bandwidth product) ultrasonic signals can be generated by driving a piezoelectric transducer with modified LFM(linear frequency modulation) *** performances are obtained in the waveform,bandwidth and linear time-frequency *** results show that better axial resolution and higher power are achieved *** than twice the amplitude of the echo from the bottom is received by the large TBWP signal over the conventional pulse-echo method,when detecting the layered structure with a high attenuation rubber block and a thin aluminum plate bonding together.

关键词： Piezoelectric transducer Large time-bandwidth product Modified linear frequency modulation signal

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INFLUENCE OF INITIAL STRESSES ON RESONANCE PROPERTIES OF FBAR

INFLUENCE OF INITIAL STRESSES ON RESONANCE PROPERTIES OF FBA...

引用

2012全国压电和声波理论及器件技术研讨会

作者： De-jin HUANG Xin-yi LUO Ji WANG School of Mech Eng & Mechanics Ningbo University

This paper investigated the effects of initial stresses on resonance properties of Film Bulk Acoustic Resonator(FBAR) in thickness-stretch *** on the fundamental piezoelastic equations of piezoelectric material with initial stress,the vibration equation of ideal FBAR under sine excitation voltage is *** solution is then obtained by using of the boundary *** series and parallel resonance frequency are presented,and the effects of initial stresses on resonance frequency,bandwidth,and effective electromechanical coupling coefficient are discussed.A numerical example is presented to show the *** results are very useful for the improvement of designing FBAR.

关键词： FBAR Initial stress Resonance frequency Bandwidth

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THREE-DIMENSIONAL VIBRATION ANALYSIS OF THE SPLIT ELECTRODE VIBRATOR USING FINITE ELEMENT METHOD

THREE-DIMENSIONAL VIBRATION ANALYSIS OF THE SPLIT ELECTRODE ...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Lin FU Dong WANG Xiu-ming WANG State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of Sciences

In this paper,ANSYS based on the finite element method is used to investigate the effects of geometry and electrodes of a split thin piezoelectric ceramic strip on its resonant frequencies and conductance related to the *** numerical results show that the fundamental frequencies decrease as the vibrator length and width *** it is mainly influenced by the longest dimension of the *** for the split electrode vibrator,when the electrode area decreases,the resonant frequencies will increase while the conductance *** order of resonant frequencies corresponding to the highest conductance is equal to the number of electrodes in the vibration *** the way of splitting electrode can increase the vibrator *** numerical results are in agreement with the existing theoretical result for the simplified *** work will give some insights for the design of high-frequency and high-performance transducer.

关键词： Resonant frequencies Conductance Sensitivity Split electrode vibrator

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SELF ASSEMBLY OF PARTICLES USING PHONONIC CRYSTAL SLABS

SELF ASSEMBLY OF PARTICLES USING PHONONIC CRYSTAL SLABS

引用

2012全国压电和声波理论及器件技术研讨会

作者： Qian WU Fei-yan CAI Hai-rong ZHENG Zhi-wen CUI Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Department of physics Jilin University

By numerically studying the acoustic radiation forces on particle above the phononic crystal slabs(PCS),we show that a guided resonant mode of PCS yields a resonantly-enhanced,stably trapped acoustic radiation force on the *** trapping patterns and acoustic radiation force dependent on the wavelength,particle size,and particle material are investigated,*** is shown that tuning the wavelength of incident acoustic wave may thus allow the formation and reconfiguration of *** expect that this system may thus allow to realize self-assembly particles.

关键词： Acoustic radiation force Self-assembly Phononic crystal

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