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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...

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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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“2010年全国压电和声波理论及器件技术研讨会”征文

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科技导报 2010年第19期28卷 58-58页

中国力学学会、中国声学学会将于2010年12月10—13日召开＂2010年全国压电和声波理论及器件技术研讨会＂。征文内容：压电理论（包括微纳米压电理论）;声波理论（表面波、体波等）;压电器件设计与分析（谐振器、传感器、换能器、MEMS／N... 详细信息

中国力学学会、中国声学学会将于2010年12月10—13日召开＂2010年全国压电和声波理论及器件技术研讨会＂。征文内容：压电理论（包括微纳米压电理论）;声波理论（表面波、体波等）;压电器件设计与分析（谐振器、传感器、换能器、MEMS／NEMS／Nano压电器件等）;压电材料（陶瓷、晶体、薄膜、微纳米等压电材料）.

关键词：压电理论技术研讨会器件设计征文内容声波中国力学学会中国声学学会压电材料

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DYNAMICAL CHARACTERISTICS RESEARCH ON THE SQUEEZED FILM DAMPER STIFFNESS ROTOR

DYNAMICAL CHARACTERISTICS RESEARCH ON THE SQUEEZED FILM DAMP...

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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 ...

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

A PIEZOELECTRIC UNIMORPH POWER HARVESTER OPERATING WITH COUP...

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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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RAYLEIGH WAVES IN PIEZOMAGNETIC/PIEZOELECTRIC STRUCTURES WITH BIASING MAGNETIC FIELDS

RAYLEIGH WAVES IN PIEZOMAGNETIC/PIEZOELECTRIC STRUCTURES WIT...

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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...

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

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

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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...

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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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