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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"

共 404 条记录，以下是41-50 订阅

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PIEZOMAGNETIC LOVE WAVES ON ORTHORTROPIC PIEZOELECTRIC HALF-SPACES

PIEZOMAGNETIC LOVE WAVES ON ORTHORTROPIC PIEZOELECTRIC HALF-...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Yan-ping KONG Ruo-meng TIAN Jin-xi LIU Institute of Engineering Mechanics Beijing Jiaotong University Department of Engineering Mechanics Shijiazhuang Tiedao University

This paper investigates Love waves propagating in the layered plate structure consisting of a piezomagnetic layer and an orthotropic piezoelectric half *** Love waves can propagate in the resulting structure and the dispersion relations of the Love waves are *** the case of a Terfenol-D layer over a KNbO substrate,the wave exists at any rotated *** results showed that the phase velocity dependent on the cutting angle and the speed of these waves is sensitive to the rotated cutting *** conclusions have important role for designing resonators,filters and SAW devices.

关键词： Piezomagnetic material Orthotropic Piezoelectric material Love wave Dispersion

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EXPERIMENTAL INVESTIGATION OF CHARACTERISTICS OF CHLADNI EFFECT

EXPERIMENTAL INVESTIGATION OF CHARACTERISTICS OF CHLADNI EFF...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Xiao-bo ZHU Jun-hui HU State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics & Astronautics

In this work,characteristics of Chladni effect around a nodal point on a metal plate vibrating flexurally are experimentally *** eggs with 440 μm diameter approximately are used as the particles for *** locus of particle clusters moving to the nodal point,and dependence of the average radial velocity of particle clusters on the vibration displacement of metal plate,particle number in a cluster,and initial radial position of particle clusters,are measured and analyzed.

关键词： Chladni effect Nodal point Particle Average radial velocity

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OVENTONE-MODE LIMITS ON AT-CUT FUNDAMENTAL CRYSTAL RESONATOR,THROUGH TWICE PLATING METHOD

OVENTONE-MODE LIMITS ON AT-CUT FUNDAMENTAL CRYSTAL RESONATOR...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Lin-lin ZHANG Beijing Chenjing Electronics co. Ltd

This paper introduces a method to limit overtone-mode on AT-Cut fundamental mode crystal *** to the energy trapping theory,twice plating method is employed to increase the mass of the main *** key design parameters are the diameter and thickness of the mass loading,which are determined so that the maximum ratio of the equivalent resistance at the overtone mode to that at the fundamental mode may be *** results in 4 MHz AT-Cut fundamental mode resonator show that the equivalent resistance of the fundamental mode is less than 30 ohm while the third-order overtone mode achieved a resistance of more than 150 ohm.

关键词： Energy trapping theory Twice plating Mass loading

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RESEARCH ON DRIVING POWER FOR DUAL-DRIVE FOOT PIEZOELECTRIC LINEAR MOTOR WITH DUAL-DRIVE FEET

RESEARCH ON DRIVING POWER FOR DUAL-DRIVE FOOT PIEZOELECTRIC ...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Guan-yin YU Wei-qing HUANG Wei-hua LIU Song PAN State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics

The design of a new driver based on Programmable System on Chip(PSOC3) is *** to the requirements of piezoelectric linear motor.a signal generator providing 4-phase sin wave voltage signal with 90° phase difference is *** embedded chip is used as the main processor,and the DMA data transmission technique is adopted to increase the efficiency of the main *** operation buffer and linear power amplifier circuit is designed and the amplitude-frequency characteristics are *** experimental and analytical results demonstrate that the driver is reliable for the piezoelectric linear motor with long-time stability and the alternation operation of the promoter.

关键词： Piezoelectric linear motor Alternate drive Direct memory access Linear amplifier

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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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DEPTH PROFILING OF COATING BY LASER ULTRASONIC TECHNIQUE

DEPTH PROFILING OF COATING BY LASER ULTRASONIC TECHNIQUE

引用

2012全国压电和声波理论及器件技术研讨会

作者： Xue-hang SONG Yong-dong PAN Zheng ZHONG Kao-shan DAI School of Aerospace Engineering and Applied Mechanics Tongji University School of Civil Engineering Tongji University

Functionally graded materials(FGMs) show great potential,and the development of new FGMs will lead to materials that have properties not achievable with homogeneous *** dispersion curves of surface acoustic wave propagating in coating structures are investigated using the reflection and transmission coefficient ***'s found that the dispersion curves are sensitive to the transverse wave velocity,but they are not very sensitive to the longitudinal wave velocity and *** algorithms adopted to handle the inverse *** object function is established based on experimental phase velocity and the theoretical *** reconstructed depth-profiling of material properties agrees well with the experimental ones.

关键词： Coating Laser ultrasonics Inverse problem Genetic algorithm

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MEASUREMENT OF THE ACOUSTIC CHARACTERISTICS OF ULTRASONIC PHASED ARRAY TRANSDUCER

MEASUREMENT OF THE ACOUSTIC CHARACTERISTICS OF ULTRASONIC PH...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Chun-guang XU Ming-kai DENG Ding-guo XIAO Liu Yang Hui-ling REN School of mechanical engineering Beijing Institute of Technology Key laboratory of fundamental science for advanced machining Beijing Institute of Technology

Acoustic field characteristic is a key factor of the ultrasonic transducer and many acoustic field measuring methods have been ***,nowadays hydrophone method which used to measure the acoustical field characteristic of ultrasonic transducer has been wildly used and *** paper introduces an advanced measuring method to get the acoustic field characteristic of the phased array transducer by means of using hydrophone.A new acoustical field scanning method and a synchronization guarantee technique will be *** experiments have been performed and some interesting phenomena have been *** these phenomena have been analyzed and some conclusions have been infered.

关键词： Ultrasonic phased array transducer Acoustical field characteristic Hydrophone Measurement system

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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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