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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...

引用

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 ...

引用

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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ACTIVE PIEZOELECTRIC-STRUCTURE ACOUSTIC CONTROL OF ENCLOSED-CAVITY

ACTIVE PIEZOELECTRIC-STRUCTURE ACOUSTIC CONTROL OF ENCLOSED-...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Li-jun LI Shi-jie ZHENG State Key Laboratory of Mechanics and Control of Mechanical Structures College of Aerospace Engineering Nanjing University of Aeronautics & Astronautics

Piezoelectric sensor and actuator has been highly concerned in active control with its perfect *** this paper,a refined hybrid enhanced assumed strain piezoelectric shell element and acoustical isoparametric element were introduced to investigate coupled problem of piezoelectric-structure ***,a formulation to calculate the response of coupled problem was ***,the negative-velocity constant gain feedback strategy was used for control algorithm;Third,an enclosed-cavity with one flexible wall was adopted to investigate active structure acoustic *** results demonstrate that the application of piezoelectric materials on control of the acoustic radiation is rational and efficient in the low frequency range.

关键词： Active control Coupling of structure-acoustic Piezoelectric material Finite element

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AN ANALYSIS OF FREQUENCY OF A QUARTZ CRYSTAL TUNING FORK RESONATOR BY MODIFIDY SEZAWA'S THEORY

AN ANALYSIS OF FREQUENCY OF A QUARTZ CRYSTAL TUNING FORK RES...

引用

2012全国压电和声波理论及器件技术研讨会

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

The resonance frequency of a quartz crystal tuning fork resonator for applications in communication and electronic system has been analyzed by Sezawa with Euler-Bernoulli beam theory and *** improve the accuracy in the vibration frequency and mode shape prediction,the Timoshenko beam theory is used with the resonator model and boundary *** solution procedure is the same and the results are different with noticeable *** reminds us that the analytical solutions are to be validated with other techniques before it can be used in the resonator design and *** emerging applications of tuning fork type resonators through MEMS technology demands further analytical studies with new approaches.

关键词： Tuning fork Frequency Quartz crystal Resonator Beam Vibration

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DYNAMICAL CHARACTERISTICS RESEARCH ON THE SQUEEZED FILM DAMPER STIFFNESS ROTOR

DYNAMICAL CHARACTERISTICS RESEARCH ON THE SQUEEZED FILM DAMP...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Rui-hua ZHANG Yin-fa ZHU Zhi-wen XIONG Yan-hui YE Institute of Technology Lishui University School of Mechanical and Electrical Engineering Nanchang University

This paper developed the kinematical model of squeezed film damper(SFD) stiffness rotor system based on the inertia parameter σ and bearing parameter B,then theoretically analyzed the amplitude-frequency characteristics and the transmission ratio characteristics of rotor system influenced with inertia parameter σ,bearing parameter B,and eccentricity ratio *** analyzed results proved it could more clearly proclaim the vibration reduction mechanism of SFD when the film inertia force parameter σ was considered in the kinematical model of the rotor ***,the vibration reduction effectiveness of SFD not only limited by the unbalance of the rotor system,but also related with the selection of the bearing parameter *** the research,it proved improper bearing parameter could directly influence the vibration reduction effectiveness of SFD,which founded theoretical basis for optical design of SFD.

关键词： Branch of mechanical engineering Squeezed film damper Inertia parameter Kinematics

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A MULTI-MODES CYLINDRICAL PIEZOELECTRIC ROTARY MOTOR WITH A SINGLE-VIBRATOR

A MULTI-MODES CYLINDRICAL PIEZOELECTRIC ROTARY MOTOR WITH A ...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Bin HE Kai XU Zeng-ping XING Ningbo Institute of Material Technology and Engineering Chinese Academy of Sciences Piezoelectric Device Laboratory Ningbo University

This paper proposes a cylindrical piezoelectric motor,which used only a single vibrator to generate bidirectional rotations through changing the driving signal *** stator of the motor consists of a brass tube and a *** finite element analysis and theoretical analysis indicated that the motor could generate a clockwise rotation at a driving frequency around the second bending mode,and an anticlockwise rotation around the third bending *** prototype motor,whose stator was 6 mm in diameter and 26 mm in length,can rotate clockwise around a driving frequency of2.208 kHz and anticlockwise around a driving frequency of 1.605 *** motor achieved a maximum speed of 840 *** research has provided a way of designing piezoelectric motors with simple structure and easy control,which has the potential for miniaturization.

关键词： Piezoelectric motor Single vibrator Bidirectional rotation Ultrasonic motor

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RAYLEIGH WAVES IN PIEZOMAGNETIC/PIEZOELECTRIC STRUCTURES WITH BIASING MAGNETIC FIELDS

RAYLEIGH WAVES IN PIEZOMAGNETIC/PIEZOELECTRIC STRUCTURES WIT...

引用

2012全国压电和声波理论及器件技术研讨会

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

The paper analyzes the propagation of Rayleigh-type surface acoustic waves in a layered piezomagnetic/piezoelectric structure affected by a biasing magnetic *** materials are assumed to be transversely *** governing equations under a biasing magnetic field are acquired based on three dimensional magnetoelectric *** dispersion relations are obtained and the phase velocities are calculated with consideration of electrically shorted case under a biasing magnetic *** effect of a biasing magnetic field on stress field and displacement along the thickness direction of the layer are presented and *** results show that the biasing magnetic field has significant effect on the phase velocity and *** analytical method and the results can be useful for the design of the magnetoelectric acoustic wave devices.

关键词： Rayleigh waves piezomagnetic piezoelectric biasing magnetic field

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AN EXPERIMENTAL STUDY ON THE STRUCTURE OF THE INTERNAL IMPACT TYPE VIBRATION ENERGY HARVESTER

AN EXPERIMENTAL STUDY ON THE STRUCTURE OF THE INTERNAL IMPAC...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Jing SUN Jun-hui HU Jin-juan ZHOU Song-mao CHEN Precision Driving Laboratory State Key Laboratory of Mechanics and Control of Mechanical StructuresNanjing University of Aeronautics & Astronautics

To increase the vibration energy-harvesting capability of the piezoelectric generator based on a cantilever beam,the authors' research group had proposed the internal impact type vibration energy harvester(IITVEH) that employs a proof mass at the tip of a cantilever beam to hit the frames of the IITVEH on the two sides of the proof *** this work,we study the effect of the structure topology of IITVEH on its output *** structural designs of IITVEH utilizing both electromagnetic and piezoelectric elements are introduced,which are named as U & Y type structures,*** the experiment,the output electric power of the U and Y type structures is compared for the same vibration excitation *** is concluded that the Y type structure has a larger total output power than the U type structure.

关键词： Vibration energy harvester Internal impact type Structure

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