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检索条件"任意字段=2015全国压电和声波理论及器件技术研讨会"

共 417 条记录，以下是81-90 订阅

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A PIEZOELECTRIC UNIMORPH POWER HARVESTER OPERATING WITH COUPLED EXTENSION AND FLEXURE MODES

A PIEZOELECTRIC UNIMORPH POWER HARVESTER OPERATING WITH COUP...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Zi-yang LIAN Lin HU Jun CHENG Yu-jue Wang Hong-ping HU Yuan-tai HU Ji WANG Department of Mechanics Huazhong University of Science and Technology Piezoelectric Device Laboratory Department of Mechanics and Engineering ScienceSchool of Mechanical Engineering and MechanicsNingbo University

We have set up a model of a piezoelectric unirnorph power harvester(PUPH).The PUPH consists of a piezoelectric layer and a metal *** end of the PUPH is fixed on a vibration base,the other end is connected by a concentrated *** PUPH scavenges energy from coupled extension and flexure vibration when excitation is inclined with the horizontal *** present a theoretical analysis on the basic behaviors of the PUPH by the theory of linear *** theoretical results agree well with that of finite element method.

关键词： Piezoelectric power harvester Unimorph Coupling vibration

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DAMAGE IDENTIFICATION IN A STEEL FRAME USING HIGH-FREQUENCY ELECTRO-MECHANICAL IMPEDANCE SIGNATURES

DAMAGE IDENTIFICATION IN A STEEL FRAME USING HIGH-FREQUENCY ...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Wei WANG Wei YAN Ji WANG Faculty of Architectural Civil Engineering and EnvironmentNingbo University Faculty of Mechanical Engineering and Mechanics Ningbo University

This paper presents an experimental investigation of damage detection of a steel frame using electro-mechanical impedance(EMI) *** on high frequency excitation,EMI technique is very sensitive to minor damage in *** are introduced by completely loosening bolts over several locations on the *** data are then analyzed by a damage index named RMSD(Root mean square deviation) for damage identification *** experimental investigation shows that the EMI technique integrated with RMSD index can identify the damage severity and location effectively,and thus the present method can provide a reliable and accurate technology for structural health monitoring.

关键词： EMI Structural health monitoring Steel frame RMSD

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EFFECTS OF A BIASING ELECTRIC FIELD ON RAYLEIGH WAVES IN MAGNETOELECTRIC STRUCTURES

EFFECTS OF A BIASING ELECTRIC FIELD ON RAYLEIGH WAVES IN MAG...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Li-li YUAN Jian-ke DU Ting-feng MA Ji WANG School of Mechanical Engineering and Mechanics Ningbo University School of Civil Engineering and Environment Ningbo University

Propagation of Rayleigh surface acoustic waves in a piezoelectric-piezomagnetic layered structure affected by a biasing electric field is studied *** on the three-dimensional equations of linear elasticity and the Maxwell equations,the differential equations of motion under a biasing electric field are derived and *** dispersion relations are obtained and discussed by regarding the coupling piezoelectric and piezomagnetic *** effect of a biasing electric field on stress field and mechanical displacement along the thickness direction of the layer are presented and *** is found that the biasing electric field has significant effect on the phase velocity and mechanical *** analytical method and the results can be useful for the design of acoustic surface wave devices consisted of piezoelectric and piezomagnetic materials.

关键词： Rayleigh waves Piezoelectric Biasing electric field Piezomagnetic

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DOA ESTIMATION OF THE MOVING TARGETS IN SHALLOW WATER BASED ON VECTOR OPTIMIZATION BEAMFORMING AND NORMAL-MODE THEORY

DOA ESTIMATION OF THE MOVING TARGETS IN SHALLOW WATER BASED ...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Nan-song LI Hai-yan SONG Sheng-chun PIAO Qing-xin MENG Science and Technology on Underwater Acoustic Laboratory Harbin Engineering University School of Electrical and Information Engineering Heilongjiang Institute of Technology

DOA estimation is one of the most important tasks for sonar ***,the performance of conventional high-resolution DOA estimation methods is influenced because of the neglect of some important factors,such as effect of underwater sound channel,the array position errors and so *** order to improve the robustness of the high-resolution DOA estimation methods,the vector optimization robust beamforming method is realized by adding a strong joint constraint to the weight vector norm and the steering vector *** addition,simulating the matched-field processing method,the DOA estimation of underwater moving targets can be computed by combining adaptive robust beamforming and normal-mode *** is shown that the adaptive beamforming which is presented in this paper has higher peak to maximum sidelobe ratio(PSR) and narrower-3dB beamwidth.

关键词： Normal mode Underwater acoustic signal Vector optimization Moving targets

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ANALYSES ON DISPERSIONS AND EXCITATIONS OF SYMMETRIC GUIDED WAVES IN A FLUID-FILLED CYLINDRICAL SHELL

ANALYSES ON DISPERSIONS AND EXCITATIONS OF SYMMETRIC GUIDED ...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Xi-qiang LI Hao CHEN Xiao HE Xiu-ming WANG State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of Sciences

To develop a new calibration standard of acoustic logging,we studied the wave propagation in a fluid-filled cylindrical shell with outside traction-free boundary *** obtained the phase- and group- velocity dispersions as well as the excitation spectrum *** results show that when the frequency of source becomes higher and reaches in the "plateau" range,the first-arrival wave is just the mode with "plateau" *** the source frequency is in a range between two "plateaus",the first-arrival wave is nearly the sum of two modes which have almost the same excitation intensities and group ***,the average phase velocity of the two modes is very close to the "plateau" *** a phenomenon can be used for the cahbration of sonic logging tools.

关键词： Calibration pit Guided wave Symmetric mode Dispersion Excitation spectrum

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BAND GAPS CALCULATION OF SCALAR WAVES IN TWO-DIMENSIONAL PHONONIC CRYSTALS WITH GENERALIZED MULTIPOLE TECHNIQUE(GMT)

BAND GAPS CALCULATION OF SCALAR WAVES IN TWO-DIMENSIONAL PHO...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Zhi-jie SHI Yue-sheng WANG Chuan-zeng ZHANG Institute of Engineering Mechanics Beijing Jiaotong University Department of Civil Engineering University of Siegen

A numerical method based on the Generalized Multipole Technique(GMT) is proposed to calculate the band gaps of scalar waves in two-dimensional phononic crystal,which is composed of arbitrary shape cylinders embedded in a host medium in square *** order to find the eigenvalues of the problem,besides the sources used to expand the wave field,an extra monopole source is introduced which acts as the external *** varying the frequency of the excitation,the eigenvalue can be localized as the extreme points of an appropriately chosen *** sweeping the frequency range of interest and sweeping the boundary of the irreducible first Brillouin zone(FBZ),the band structure will be *** numerical examples are illustrated to validate the present method.

关键词： Phononic crystals Generalized multipole technique(GMT) Band gaps Eigenvalue problems

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RESONANT GIANT MAGNETOELECTRIC EFFECT OF PIEZOELECTRIC/MAGNET COMPOSITES

RESONANT GIANT MAGNETOELECTRIC EFFECT OF PIEZOELECTRIC/MAGNE...

引用

2012全国压电和声波理论及器件技术研讨会

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

The frequency dependence of giant magnetoelectric(ME) effect origining from the coupling of piezoelectricity and magnetic torque in piezo-bimorph/magnet composites has been *** ME effect was dramatically enhanced when the ME composite operates around the first bending mode resonant *** evaluate and predict the ME performance at different frequencies,we've theoretically derived the ME voltage equation for the Piezo-bimorph/magnet device,basing on the piezoelectricity principle and mechanical vibration *** experiments also confirmed our *** research has provided guides for scientists/engineers to constructed low cost and passive ME device with giant ME effect.

关键词： Magnetoelectric effect Piezoelectricity Resonance Magnetic torque

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A BRIEF VIEW OF THE CURRENT STATE OF THE DEVELOPMENT AND AGING PERFORMANCE OF FIXED FREQUENCY SURFACE ACOUSTIC WAVE(SAW) OSCILLATOR

A BRIEF VIEW OF THE CURRENT STATE OF THE DEVELOPMENT AND AGI...

引用

2012全国压电和声波理论及器件技术研讨会

作者： C.S.LAM P.Y.SU C.H.CHEN TXC Technology Inc.MilpitasCaliforniaUSA TXC Corporation

The recent rapid expansion of optical fiber networking market fuels the demand for accurate 100～400 MHz fixed frequency oscillators based on surface acoustic wave(SAW) ***,several suppliers can offer small size and cost efficient SMD single-end and differential SAW oscillators(SOs) with very good phase jitter *** customers prefer SO solution as it is free of the unsettling problems from some crystal oscillator(XO) solutions- high cost of high frequency fundamental(HFF) and inverted mesa(IM) crystal blanks,spurious modes,frequency jumping,drive level sensitivity,high cost of phase lock loop(PLL) die,*** paper is to provide a brief view of the current state of the development of fixed frequency *** on the aging data of more than 20,000 hours at 125℃,the authors also comment on the SO aging performance fabricated using different SAW wave-types.

关键词： SAW Oscillator Quartz Crystal Aging

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A STUDY ON AIRBORNE PIEZOELECTRIC TRANSDUCER FOR GEOLOGICAL SIMULATION

A STUDY ON AIRBORNE PIEZOELECTRIC TRANSDUCER FOR GEOLOGICAL ...

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2012全国压电和声波理论及器件技术研讨会

作者： Sheng ZHOU Chao CHEN State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics

In this work,we report a new application of airborne piezoelectric transducer for ultrasonic seismic physical modeling *** the lab,we can obtain the internal structure of geologic model by analyzing the received echo signals which were launched by airborne ultrasonic *** we use different piezoelectric materials and matching layers to design and manufacture airborne *** piezoelectric materials are ferroelectric single crystals(PMNT),1-3 composites with volume fraction of 60% and 15% *** membranes as matching layers can improve more than 20 dB in two-way insertion loss which is a good solution to acoustic match of airborne *** experiments show that the airborne transducer made with 1-3 composites with volume fraction of 60% has the best bandwidth and sensitivity compared to the other *** characteristics of its high sensitivity and broadband are very suitable for airborne transducers in geological simulation field.

关键词： Piezoelectric transducer Airborne applications Geological simulation

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PREPARATION AND PIEZOELECTRIC ANALYSIS OF THE MULTILAYER FILMS FOR FBAR

PREPARATION AND PIEZOELECTRIC ANALYSIS OF THE MULTILAYER FIL...

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2012全国压电和声波理论及器件技术研讨会

作者： Lin SU Bao-he YANG Cui-ping LI College of Precision Instrument and Opto-Electronic Engineering Tianjin University Tianjin Key Laboratory of Film Electronic and Communication Devices Tianjin University of Technology

A multilayered structure of Al/ZnO/Al/DLC for FBAR was prepared in this research,and its piezoelectric performance was *** results show that DLC film with high sp content can be prepared at room temperature by using ECR-CVD system with the power of 1200 W,the total pressure of 1Pa,as well as the CH and Ar gas ratio of 1:*** c-axis oriented ZnO films can be prepared with the optimized process parameters,and their performance can be further improved by annealing *** piezoresponse amplitude and phase of the ZnO films were measured by using piezoresponse force microscopy（PFM）.The results indicate that the ZnO film prepared at 250℃ temperature has good piezoelectric performance,meeting the requirement of the piezoelectric layer for FBAR.

关键词： ZnO FBAR Piezoresponse PFM

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