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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41-50 订阅

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INVERSION OF SHEAR VELOCITY PROFILE IN A CASED BOREHOLE

INVERSION OF SHEAR VELOCITY PROFILE IN A CASED BOREHOLE

引用

2012全国压电和声波理论及器件技术研讨会

作者： Ming-ming MA Hao CHEN Xiu-ming WANG Xiao HE State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of Sciences

The theoretical model in this study is constructed with a fluid-filled well-bonded cased borehole with a radially layered formation *** thickness and shear velocity of each layer are different from that of others,and it may not be inverted from flexural dispersion data *** A parametric exponential profile controlled by three parameters to express the radial variations of the formation shear velocity approximately are used,and the objective function for inverting the three parameters based on the modified perturbation method is *** inverted results demonstrate the validity of the radial profiling *** analysis of effect of factors on the inverted results,we have obtained preliminary conclusions.

关键词： Sonic logging Cased well Shear velocity Radial profile

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DESIGN OF A DOUBLE CAVITIES PIEZOELECTRIC PERISTALTIC PUMP WITH FINITE ELEMENT METHOD

DESIGN OF A DOUBLE CAVITIES PIEZOELECTRIC PERISTALTIC PUMP W...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Liang XU Ming YANG Wen-chu OU Sang-di FU Department Electronic Information and Electrical Engineering Shanghai Jiao Tong University

A new type of piezoelectric peristaltic pump which contains two cavities is designed in this *** peristaltic pump is driven by travelling wave of the piezoelectric actuator which is designed according to the vibration principle of annular circular *** finite element model of the actuator is built in ANSYS and according to the harmonic response analysis results the structure of the actuator is *** this design both the positive and negative direction vibration of annular piezoelectric element can be fully *** flow rate of the pump could be significantly *** heat generated by the annular piezoelectric can be taken away by the floating liquid at the same *** of piezoelectric peristaltic pump is improved.

关键词： FEM Traveling-wave actuator Piezoelectric peristaltic pump Double cavities

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THE STUDY OF HIGH-FREQUENCY BROAD-BAND UNDERWATER TRANSDUCERS

THE STUDY OF HIGH-FREQUENCY BROAD-BAND UNDERWATER TRANSDUCER...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Kai ZHANG Hangzhou Applied Acoustics Research Institute

There are many advantages of broadband transducers,such as reducing of signal distortion,widening the security about information transmission,reducing the ratio of false *** combine of piezoelectric pillars and dual matching layers can expand the bandwidth of the high-frequency *** one-eighth finite element model of transducer was set up with ANSYS software and the structure of the transducer was optimized.A final transducer was designed,which used the first thickness mode,the second thickness mode and the third thickness *** bandwidth of the transducer is 47kHz-159 kHz,in which the ripple of the transmitting voltage response does not exceed ±*** are several conclusions from the research:the bandwidth of pillar transducers can be expanded by the first thickness mode,the second thickness mode and the third thickness mode,and it gives a method to achieve the broad-band projecting performance of high-frequency transducers.

关键词： Underwater transducers High-frequency Finite element method

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DEDUCING AND VERIFYING THE FREQUENCY EQUATION SET OF DUAL-FREQUENCY PIEZOELECTRIC TRANSDUCER

DEDUCING AND VERIFYING THE FREQUENCY EQUATION SET OF DUAL-FR...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Jia-he FU Han-ying MAO Zhen-feng HUANG Han-ling MAO School of Mechanical Engineering Guangxi University Dept.of Autos Guangxi University of Technology

Two different operating frequencies were required in dual-frequency piezoelectric transducers,a frequency equation set that satisfy with the requirement were deduced in this *** different dual-frequency piezoelectric transducers were designed;then modal analysis and frequency response analysis for these transducers model were completed with ANSYS software,the frequencies obtained by simulation were very close to the design *** the frequency equation set has been verified.

关键词： Piezoelectric Transducer Dual-frequency Frequency equation set ANSYS

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SCATTERING PROBLEM OF THE INTERFACE CIRCULAR CAVITY IN PIEZOELECTRIC MEDIA

SCATTERING PROBLEM OF THE INTERFACE CIRCULAR CAVITY IN PIEZO...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Lei LIU Cun-fa GAO State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics & Astronautics

The present work investigates the scattering problem of plane SH wave in piezoelectric media with an interface circular *** using the Hankel functions and the expansion method of wave functions,the basic Green's function solutions are ***,based on the interface continuity conditions,the integral equations of the scattering problem with the interface circular cavity are *** solving the integral equations,the dynamic stress around the hole is *** numerical examples are given to show the influence of the material parameters upon dynamic concentration *** is found that the change of the material parameters has a great influence on the dynamic stress concentration.

关键词： Piezoelectric materials SH wave Green's function Interface circular cavity

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PROPERTIES OF MINIATURE X-AND Z'-ELONGATED RECTANGULAR AT-CUT QUARTZ RESONATORS OF DIFFERENT SIZES

PROPERTIES OF MINIATURE X-AND Z'-ELONGATED RECTANGULAR AT-CU...

引用

2012全国压电和声波理论及器件技术研讨会

作者： S.Y.PAO Q.Q.PAN J.S.CHUNG W.Y.CHANG T.LIN M.K.CHAO C.S.LAM TXC(Ningbo)Corporation

In this study,we present the different properties of beveling process,equivalent series resistance(ESR),temperature curves,temperature hysteresis,and shock resistance of different sizes of X- and Z'-elongated rectangular AT-cut quartz *** results show the Z'-elongated quartz strip mounted on the two width sides has better performance in temperature hysteresis and shock *** for mode coupling,beveling process,and temperature curve,X- and Z'-elongated rectangular AT-cut quartz plate have their respective properties.

关键词： AT-Cut Resonator Quartz Crystal Plate Aspect Ratio

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THE ANTI-PLANE VIBRATION OF QUARTZ PLATE WITH AN ADDITIONAL PARTIAL NON-UNIFORM MASS LAYER

THE ANTI-PLANE VIBRATION OF QUARTZ PLATE WITH AN ADDITIONAL ...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Peng LI Feng JIN State Key Laboratory for Mechanical Structure Strength and Vibration Xi'an Jiaotong University

The anti-plane vibration of a quartz plate having an additional partial non-uniform mass layer on its upper surface is solved by ignoring the effect of small c in comparison with other elastic *** on the Fourier sine and cosine series solution,the convergence and verification are *** frequency spectrum,as well as the energy trapping,are *** with the homogeneous mass layer,the non-homogeneous layer with greater inertia leads to more modes trapped under the same *** the results obtained give theoretical guidance for physical phenomena explanations of layer properties in quartz crystal microbalance.

关键词： Anti-Plane Vibration Non-Uniform Mass Layer Frequency Shift Energy Trapping

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ANALYSIS AND DEVELOPMENT OF PLATE-ATTACHED CYLINDRICAL ROTARY-LINEAR ULTRASONIC MOTOR

ANALYSIS AND DEVELOPMENT OF PLATE-ATTACHED CYLINDRICAL ROTAR...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Ting-hai CHENG Xiang-dong GUO Gang BAO Han GAO Cheng-feng XIAO School of Mechatronics Engineering Harbin Institute of Technology

Piezoelectric element is the core component of ultrasonic motor utilized to transform electric energy into mechanical *** the exciting mode of piezoelectric element has a significant influence on the output characteristics of ultrasonic *** vibration characteristics of plate-attached cylindrical rotary-linear ultrasonic motor with driving screw thread pair were analyzed *** detail,the influence of exciting position and length of PZT plates on the output performance of stator were *** confirmation was accomplished to theoretical results by finite element method.A plate-attached cylindrical rotary-linear ultrasonic motor prototype was *** on the virtual instrument technology,a testing system was realized and the prototype motor was tested.

关键词： Ultrasonic motor Bending vibration Rotary-linear motion Virtual instrument

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ASYMMETRIC LAMB WAVE PROPAGATION IN GRADED GRATING PHONONIC CRYSTAL SLABS

ASYMMETRIC LAMB WAVE PROPAGATION IN GRADED GRATING PHONONIC ...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Jiu-jiu CHEN Hong-bo ZHANG Xu HAN State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanics and Vehicle EngineeringHunan University

The unidirectional transmission of Lamb wave in low-frequency domains is realized by graded grating phononic crystal slabs This exotic phenomenon stems from the threshold frequency of the fundamental antisymmetric Lamb mode conversion to the fundamental symmetric Lamb mode is different at the different locations of the acoustic *** should be potentially significant in helping design chip-scale directional phononic devices.

关键词： Asymmetric propagation Phononic crystal slabs

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FAST ALGORITHM FOR THE METHOD OF FUNDAMENTAL SOLUTION SUBJECTED TO SYMMETRY PROBLEMS

FAST ALGORITHM FOR THE METHOD OF FUNDAMENTAL SOLUTION SUBJEC...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Li-na WU Hai-e WEI Quan JIANG College of Science Nantong University College of Civil Engineering Nantong University

The basic equations of a type of ellaptical PDEs and the coordinate transformation technique are provided in this *** on the idea of image technique,the fundamental solutions are reconstructed for the symmetrical problems to reduce the computational *** the numerical experiments,it is seen that the results in this paper have good accuracy and high *** with coordinate transformation technique can solve more elliptical PDES compared with the classic field of harmonic and biharmonic *** particular,the programming,date preparing and the linear equations for computing can be greatly reduced by using the reconstructed fundamental solutions with image technique.

关键词： Method of fundamental solution Image technique Coordinate transformation

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