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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"

共 404 条记录，以下是101-110 订阅

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SIMULATION OF BROADBAND SOUND PROPAGATION IN SHALLOW WATER ENVIRONMENTS

SIMULATION OF BROADBAND SOUND PROPAGATION IN SHALLOW WATER E...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Li LI Hai-gang ZHANG Sheng-chun PIAO Yun-he LI Ya-xiao MO Science and Technology on Underwater Acoustic Laboratory Harbin Engineering University Unit 92337 of People's Liberation Army

In this paper,broadband sound propagation in shallow water environments is *** synthesis method of frequency-domain solutions is selected to do the simulation of *** frequency-domain calculations in Pekeris waveguide are carried out by normal mode model *** improve the computational efficiency,parallel computing of KRAKEN is implemented based on MPI(Message Passing Interface) *** the Fast Fourier Transform(FFT) part of Fourier synthesis is performed using CUDA(Compute Unified Device Architecture).Evaluation shows that parallel programming of Fourier synthesis saves run-time ***,a more realistic shallow water environment iavolving elastic bottom is taken into *** present that the propagation of a broadband pulse in shallow water environments is strongly affected by the elastic parameters of the ocean *** modal arrival structures are analyzed for all *** the dispersion characteristics are exhibited by simulation results.

关键词： Fourier synthesis Broadband modeling Seismic wave propagation Parallel programming

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PIEZOELECTRETS:POLYMER FOAMS FOR TRANSDUCER APPLICATIONS

PIEZOELECTRETS:POLYMER FOAMS FOR TRANSDUCER APPLICATIONS

引用

2012全国压电和声波理论及器件技术研讨会

作者： Peng FANG Zheng WEI Guang-lin LI The Key Lab of Health Informatics of Chinese Academy of Sciences(CAS) Institute of Biomedical and Health EngineeringShenzhen Institutes of Advanced TechnologyCAS

Piezoelectric materials are commonly used in various sensors and *** the traditional piezoelectric ceramics such as Lead Zirconate Titanate and polar piezoelectric polymers such as β-phase Polyvinylidene Fluoride,piezoelectrets have recently become a new group of piezoelectric *** are functional polymer systems for electromechanical transduction,with elastically heterogeneous cellular structures and internal quasi-permanent dipole *** piezoelectricity of piezoelectrets stems from linear changes of the dipole moments in response to external mechanical or electrical *** with the traditional piezoelectric materials,piezoelectrets own several desirable *** this paper,the preparation processes and the properties of piezoelectrets were introduced and then the possible performance improvement was ***,some promising applications of piezoelectrets were proposed.

关键词： Piezoelectricity Piezoelectret Transducer Polymer

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FABRICATION OF BULK ACOUSTIC WAVE RESONATOR BASED ON ALN THIN FILM

FABRICATION OF BULK ACOUSTIC WAVE RESONATOR BASED ON ALN THI...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Jie YANG Xiang-quan JIAO Rui ZHANG Hui ZHONG Yu SHI State Key Laboratory of Electronic Thin Films and integrated Devices University of Electronic Science and technology of China

AIN thin film is an ideal material for preparing BAW *** acoustic wave(BAW) resonator based on AIN thin films is compatible with standard IC *** advantage makes sense for realizing a one-chip front-end *** this study,a reliably process for making an air-gap bulk acoustic wave resonator based on AIN thin film was *** c-axis oriented AIN thin film was achieved on Mo electrode by reactive radio frequency sputtering *** improved planarization process and extending the edge of bottom electrode were introduced to avoid AIN thin film cracking at the *** BAW resonator,with lOOnm bottom electrode,2500 nm AIN piezoelectric layer and 300 nm top electrode,has exhibits a resonant frequency of around 1.51 GHz.

关键词： Bulk acoustic wave(BAW)resonator AIN C-axis oriented Cracking

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THE MULTICOUPLED MAGNETOELECTRIC EFFECT IN THREE-PHASE Tb1-xDyxFe2/ Pb(Zr1-xTix)O3/NdFeB BIMORPH LAMINATES

THE MULTICOUPLED MAGNETOELECTRIC EFFECT IN THREE-PHASE Tb1-x...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Zeng-ping XING Kai XU Bin HE Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Material Technology and EngineeringChinese Academy of Sciences Piezoelectric Device Laboratory Ningbo University

Multicoupled magnetoelectric（ME） effect originated from the interaction of magnetostriction,magnetic-torque and piezoelectricity was proposed.A three-phase TbDyFe/Pb(ZrTix)O/NdFeB bimorph laminates with this mechanism was designed and *** found that the magnetic DC bias could tune the multicoupling and lead to an enhancement or attenuation in ME *** ME voltage coefficient could be enhanced by a factor of 2.6 times（or 2.2 times for practical device construction） that of a conventional bimorph ME device.A simple and effective mode analysis method was introduced for the multicoupled device *** research has provided a sight of designing better ME devices with the multicoupling consideration.

关键词： Magnetoelectric Magnetic torque Multicoupling Modes analysis

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2D AND 3D GREEN'S FUNCTIONS FOR PYROELECTRIC MEDIA

2D AND 3D GREEN'S FUNCTIONS FOR PYROELECTRIC MEDIA

引用

2012全国压电和声波理论及器件技术研讨会

作者： Peng-Fei HOU Jie TONG Hai-Yang JIANG Department of Engineering Mechanics Hunan University

Green's functions play an important role in electroelastic analyses of pyroelecric ***,most works available on this topic are on case of identical *** on the 2D and 3D general solution of pyroelectric media,which is expressed in harmonic functions,and employing the trial-and-error method,the 2D and 3D Green's function for a steady line heat source and a steady point heat source in semi-infinite,infinite and two-phase pyroelectric plane and media is presented by newly induced harmonic functions with undetermined *** corresponding coupled field can be obtained by substituting these functions into the 2D and 3D general solution,and the undetermined constants can be obtained by boundary conditions,continuous conditions and equilibrium conditions.

关键词： 2D 3D Green's function Semi-infinite Infinite Two-phase Pyroelectric

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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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THE MAGNETOELECTRIC EFFECTS OF TERFENOL-D/PZT/TERFENOL-D LAMINATED STRUCTURES

THE MAGNETOELECTRIC EFFECTS OF TERFENOL-D/PZT/TERFENOL-D LAM...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Long XIA Jian-ke DU Ji WANG Department of Engineering Mechanics Ningbo University

Magnetoelectric(ME) laminated materials,especially laminate ME composites made by combining magnetostrictive and piezoelectric layers,exhibit excellent ME effect,and meet the demands of practical application for sensors,transducers *** laminate ME composites,the ME effect is derived from the coupling between a magnetostrictive effect in the magnetostrictive layers and a piezoelectric effect in the piezoelectric *** Magnetoelectric material of Terfenol-D/PZT/Terfenol-D(MPM) can be used as a type of magnetoelectric *** paper investigates the magnetoelectric effects of laminated piezomagnetic/piezoelectric structures by means of *** a proper biasing magnetic field and a drive magnetic field of proper frequency the laminated structures exert the better magnetoelectric *** can be found that in a bias magnetic field of 300-400 Oe and an alternating magnetic field of 1Oe,the peak of magnetoelectric voltage conversion coefficient of resonant frequency is 613.7mV/*** for the laminated structure used in the test.

关键词： Magnetoelectric Biasing magnetic field Resonant frequency

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ADVANCES IN DESIGN,GROWTH AND APPLICATION OF PIEZOELECTRIC CRYSTALS WITH LANGASITE STRUCTURE

ADVANCES IN DESIGN,GROWTH AND APPLICATION OF PIEZOELECTRIC C...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Yan-qing ZHENG Su-xian CUI Jian-jun CHEN Xiao-niu TU Jun XIN Hai-kuan KONG Er-wei SHI Shanghai Institute of Ceramics Chinese Academy of Sciences

Crystals with langasite structure consist of more than one hundred *** about 20 compounds are grown and *** this work,we first use first-principles calculation to simulate the crystal structure of 29 ordered langasite compounds and then forecast their piezoelectric related properties including dielectric constants,elastic constants,piezoelectric coefficients and electromechanical *** known ordered crystals including SNGS,STGS,CTGS,CNGS,and several novel crystals including BTGS,CTAS,CNAS were grown by Czochralski method and characterized at room temperature and at high temperature from 400 to 900℃.The experimental results of piezoelectric properties verified the validity of theoretical forecast and that errors between experimental and theoretical results were in reasonable ***-free crystals shown good prospect in application of piezoelectric sensors,combining the advantages of low cost of raw materials and high *** efforts should be paid to the growth of these novel crystals.

关键词： Piezoelectric crystals Langasite Design First-principles

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2D NONCONTACT MANIPULATION OF A SINGLE SILVER NANOWIRE

2D NONCONTACT MANIPULATION OF A SINGLE SILVER NANOWIRE

引用

2012全国压电和声波理论及器件技术研讨会

作者： Hua-qing LI Jun-hui HU State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics

In this work,we have put forward and demonstrated a noncontact manipulation strategy that uses an ultrasonic micro-beak to suck,align,trap and transfer a single nanowire in water film on the surface of a glass *** sucking and trapping force is generated by acoustic streaming eddies flowing into the micro-beak tip in ultrasonic vibration,from the front of the micro-beak and along the direction perpendicular to micro-beak vibration.A nanowire in front of the micro-beak can be trapped under micro-beak and rotated to the direction perpendicular to the micro-beak vibration during the sucking *** range of the micro-beak becomes larger as its vibration increases,and the transfer speed of a sucked nanowire depends on its relative position to the micro-beak.A trapped nanowire,which is not in contact with the micro-beak,can be dragged on the substrate surface by moving the micro-beak,along an arbitrary 2D path on substrate in the water film.

关键词： Noncontact manipulation Single nanowire Micro-beak Acoustic streaming

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PROPAGATION OF NONLINEAR LOGITUDINAL WAVES IN AN ELASTIC ROD

PROPAGATION OF NONLINEAR LOGITUDINAL WAVES IN AN ELASTIC ROD

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2012全国压电和声波理论及器件技术研讨会

作者： Rong-xing WU Lan-zhen YU Wei SHI Jing YU Ji WANG Department of Architectural Engineering Ningbo Polytechnic Piezoelectric Device Laboratory School of Mechanical Eng.& MechanicsNingbo University

The nonlinear longitudinal wave propagation in a rod is studied by the homotopy analysis method and obtained analytical solutions which are the same as earlier known *** also employed the explicit and implicit finite difference methods to solve this nonlinear equation,*** numerical results showed the wave form depends on many factors such as driving frequency,amphtude,nonlinear elastic constant,and wave *** found that compared with the explicit finite difference method,the implicit finite difference method need less amount of the grid but require more computational time to obtain rehable *** also found out that the energy of multiple-frequency components becomes larger with longer traveling distance.

关键词： Nonlinear Longitudinal wave Homotopy analysis method Finite difference method

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