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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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FREQUENCY-TEMPERATUREANALYSIS OF THICKNESS-SHEAR VIBRATIONS OF SC-CUTQUARTZ CRYSTAL PLATES WITH THE FIRST-ORDER MINDLIN PLATE EQUATIONS

FREQUENCY-TEMPERATUREANALYSIS OF THICKNESS-SHEAR VIBRATIONS ...

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 Jian-ke DU Ting-feng MA Piezoelectric Device Laboratory School ofMechanical Engineering & Mechanics Ningbo University

With the incremental thermal field theory by Lee and Yong,we have truncated equations for the analysis of thickness-shear vibrations of SC-cut crystal *** assuming straight-crested waves in a rectangular plate,we obtained the frequency-temperature relations of the thickness-shear mode to study the effect of plate configurations as well as the electrodes for the properties of quartz crystal *** before,such results will be useful in the accurate design and improvement of resonator structures.

关键词： SC-cut quartz crystal plates Mindlin plate theory Vibration Frequency-temperature behavior

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THEORY ON THE AIR-COUPLE WAVE PROPAGATION IN LAYERED COMPOSITE MATERIALS WITH LAMINATE DEFECT

THEORY ON THE AIR-COUPLE WAVE PROPAGATION IN LAYERED COMPOSI...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Song LING Yong-dong PAN Kao-shan DAI Institute of Acoustic Tongji University School of Aerospace and Applied Mechanics Tongji University School of Civil Engineering Tongji University

It has been known for many years that defects exist along interfaces between two dissimilar materials,and conventional contact ultrasonic techniques are not always enable to detect the defects,so more advanced methods are still *** this paper,the spring model for the layered composite materials is built to simulate wave propagation.A stiffness matrix-based method is proposed for quantifying the transmission *** solutions of the characteristic equations are numerically efficient and *** work has shown that the spring models are well adapted to evaluate the quality and integrity of complex composite structures.

关键词： Spring model Stiffness matrix Laminate composite materials Air-coupled

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NON-SYMMETRIC DYNAMIC CHARACTERISTICS OF SPHERICALLY SYMMETRIC PIEZOELECTRIC SHELL

NON-SYMMETRIC DYNAMIC CHARACTERISTICS OF SPHERICALLY SYMMETR...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Zu-guang YING Department of Mechanics School of Aeronautics and AstronauticsZhejiang University

Piezoelectric structures are applied broadly in engineering and their accurate analysis is *** shell structures have better electrical-mechanical coupling properties,but they have non-symmetric dynamic *** paper studies on the non-symmetric characteristics of spherically symmetric piezoelectric *** basic equations of piezoelectric spherical shell are given and converted into ordinary differential equations by using the Galerkin *** description in spherical coordinates with electrical-mechanical coupling induces the non-symmetric generalized stiffness *** asymmetric system eigenvalues differ from the corresponding singular values and the symmetrized system *** left and right eigenvectors of the asymmetric system have the cross-orthogonality relations which differ from the conventional symmetric system *** results illustrate the non-symmetric system eigenvalues and singular values,and their relative differences for different piezoelectric *** the non-symmetry of piezoelectric shells needs to be considered in the dynamic analysis.

关键词： Piezoelectric spherical shell Dynamic characteristics Non-symmetry

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THICKNESS-SHEAR AND THICKNESS-TWIST MODES IN AN OBLATE ELLIPTICAL CERAMIC CYLINDER AND ENERGY TRAPPING IN CONTOURED ACOUSTIC WAVE RESONATORS

THICKNESS-SHEAR AND THICKNESS-TWIST MODES IN AN OBLATE ELLIP...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Hui-jing HE Jia-shi YANG Yi-hua HUANG Department of Mechanical and Materials Engineering University of Nebraska-Lincoln Department of Electronic and Communication Engineering Sun Yat-sen University

We study shear-horizontal motions of a piezoelectric ceramic cylinder with an oblate elliptical cross section and axial *** thickness-shear and thickness-twist vibration modes are *** modes show energy trapping,i.e.,the vibration is mainly confined near the thick,central region and decays to almost nothing near the *** results are useful for the understanding and design of contoured piezoelectric resonators for strong energy trapping.

关键词： Elliptic Resonator Energy trapping

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ANALYSIS OF PIEZOELECTRIC LAMINATED PLATES USING THE LAYERWISE PLATE THEORY AND RADIAL BASIS FUNCTION COLLOCATION METHOD

ANALYSIS OF PIEZOELECTRIC LAMINATED PLATES USING THE LAYERWI...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Yu YIN Lin-Quan YAO School of Mathematical Science Soochow University School of Urban Rail Transportation Soochow University

In this paper,a new formulation of piezoelectric laminated plates based on the linear piezoelectricity theory and the layerwise theory is *** linear piezoelectricity theory focuses on the coupling between mechanical deformations and the charge equations of *** layerwise theory is used for the mechanical displacement field and the potential *** equations of motion and boundary conditions are developed using an energy principle.A meshless collocation method based on the radial basis function is used to discrete the system *** proposed approach is good in that it can reflect the laminar stress effect,produce exactly electromechanical behaviors and accommodate multiple voltage inputs or *** examples verify the validity and precision of the proposed method.

关键词： Piezoelectric laminated plate Layerwise theory Meshless collocation method Radial basis function

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SPOT FORMATION AND ALIGNMENT OF SILVER NANOWIRES USING ULTRASONIC STAGE

SPOT FORMATION AND ALIGNMENT OF SILVER NANOWIRES USING ULTRA...

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2012全国压电和声波理论及器件技术研讨会

作者： Yu-jie ZHOU Jun-hui HU State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics

In this work,we report the use of a low-frequency circular ultrasonic stage to form a circular spot of silver nanowires(AgNWs) at the stage center and to align AgNWs on the stage surface *** manipulations are implemented within aAgNW suspension droplet at the center of the ultrasonic *** operating frequency of the ultrasonic stage is 21.3kHz and the AgNWs have diameter of 100 nm and length of 30 μm *** spot diameter and thickness are several hundred microns to several microns,*** the droplet dries out by natural evaporation without ultrasound,the spot and radial alignment have little change in the size and *** analyses show that the spot formation and radial alignment of AgNWs are caused by the acoustic streaming in the radial direction in the droplet.

关键词： Spot formation Radial alignment Silver nanowires Acoustic streaming Ultrasonic stage

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GREEN'S FUNCTION FOR AN ELECTRICALLY PERMEABLE CRACK IN THERMOPIEZOELECTRIC MATERIALS

GREEN'S FUNCTION FOR AN ELECTRICALLY PERMEABLE CRACK IN THER...

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2012全国压电和声波理论及器件技术研讨会

作者： Ai-bing ZHANG Bao-lin WANG Graduate School at ShenZhen Harbin Institute of Technology

The generalized 2D problem of thermopiezoelectric materials containing an electrically permeable crack under thermal-mechanical loading is studied in this *** on the Stroh formalism and Green's function method,the problem is reduced to a set of singular integral equations which are solved in *** the crack is assumed to be traction free,the crack opening displacement must be negative between one half of the crack faces unless a sufficiently large tensile stress is ***,Green's function of the stress and electric displacement intensity factors at each crack tip are *** results can be directly applied to the fracture analysis of piezoelectric materials in engineering applications if the crack interior is filled with conductive media.

关键词： Piezoelectric fracture Intensity factor Green's function Thermal stress

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CONTACT TRAPPING,ALIGNMENT AND 3D TRANSFER OF A SINGLE NANOWIRE USING ACOUSTIC STREAMING

CONTACT TRAPPING,ALIGNMENT AND 3D TRANSFER OF A SINGLE NANOW...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Ning LI Jun-hui HU State Key Lab of Mechanics and Control of Mechanical Structures' Nanjing University of Aeronautics and Astronautics

The acoustic streaming,which usually flushes trapped entities away,has been viewed as a negative factor in acoustic *** we report a method that uses mobile acoustic streaming to effectively trap a single nanowire within water film on substrate *** streaming is generated by a micro-probe with uniform diameter and in *** trapped nanowire,which is pushed onto the micro-probe surface by the streaming,is constantly perpendicular to the micro-probe vibration and symmetric about the micro-probe *** can be stably transferred through any 3D path in the water film by moving the micro-probe.

关键词： Manipulations Single nanowire Acoustic streaming Micro-probe

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THE ANALYTICAL SOLUTION AND NUMERICAL SIMULATION OF THE P-SV WAVE PROPAGATION IN THE PIEZOELECTRIC LAMINATE

THE ANALYTICAL SOLUTION AND NUMERICAL SIMULATION OF THE P-SV...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Lei LIU Yong-dong PAN Zheng ZHONG School of Aerospace Engineering and Applied Mechanics Tongji University

The piezoelectric material is playing a more and more important role in the active control of the wave *** the propagation of P-SV wave in the laminate has been analyzed,the acoustic field distribution of the piezoelectric laminate is not definitely posted,and the relationship between the transmission coefficients and the incident angle is still not enough *** this paper,the P-SV wave propagation in the piezoelectric laminate is studied,and a model of the problem is established,and the propagations simulated by the COMSOL multi-physics *** transmission coefficients under the different electrical boundary conditions are obtained numerically,meanwhile the results are compared to those obtained by the softness matrix *** the analytical and numerical results agree quite well for the piezoelectricity ignored plate and the electric circuit open or closed piezoelectric *** acoustic field and electric field distribution are also obtained by the numerical simulation.

关键词： Piezoelectric laminate P-SV wave Simulation Transmission coefficient

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A METHOD FOR IMPROVING THE ELECTRICAL LIMIT OF THE LANGEVIN ULTRASONIC TRANSDUCER

A METHOD FOR IMPROVING THE ELECTRICAL LIMIT OF THE LANGEVIN ...

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2012全国压电和声波理论及器件技术研讨会

作者： Zhao-feng LIANG Xi-ping MO Guang-ping ZHOU Department of Electronic Engineering Shenzhen Polytechnic Institute of Acoustics Chinese Academy of Sciences

The Langevin ultrasonic transducer is widely used in many high-power ultrasonic *** output power of a Langevin ultrasonic transducer is limited by many factors,and the electrical limit is one of most important *** this paper,the reason which restricts the improvement of the electrical limit is briefly analyzed for a typical Langevin ultrasonic *** order to improve the transducer's electrical limit,a method,by adjusting the piezoceramic rings' thicknesses according to their positions in the transducer,is put forward.A design example is performed by using a FEM software,and the simulation results demonstrate the validity of the theoretical analysis and the method.

关键词： Langevin ultrasonic transducer Piezoceramic rings Electrical limit ANSYS Optimization

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