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RESEARCH ON THE S-TYPE LINEAR PIEZOELECTRIC MOTOR

RESEARCH ON THE S-TYPE LINEAR PIEZOELECTRIC MOTOR

引用

2012全国压电和声波理论及器件技术研讨会

作者： Sheng ZHANG Wei-qing HUANG Yin WANG State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics

This paper has presented a S-type linear piezoelectric motor based on the principle of inchworm,and analyzed the structure and operation principle of the *** on the analysis of the actuator's stator,the output performance of proposed actuator is *** results show that the output displacement of the actuator is stable,and the displacement for single step is 0.625 μm when the actuating voltage is 100 *** velocity and acceleration properties of the linear actuator are *** to the testing results,the dynamic response performance of the actuator is analyzed *** experimental results show that the proposed piezoelectric linear actuator has good dynamic performance and stability motion.

关键词： Piezoelectric linear motor Inchworm motion Piezoelectric ceramics Ground-clamp

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ANALYSIS OF THE PERFORMANCE OF UNDERWATER ACOUSTIC PARAMETRIC ARRAY UNDER DIFFERENT INPUT SIGNALS

ANALYSIS OF THE PERFORMANCE OF UNDERWATER ACOUSTIC PARAMETRI...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Lin-lang BAI Hangzhou Applied Acoustic Research Institute

According to Berktay the far-field solution of parametric array,self-demodulatory sound pressure is proportional to squared of envelope function to the second derivative of the *** excitation input signals of parametric array were designed and analyzed.A parameter array is measured under the different excitation *** results show that:(1)When the input signals is single-sideband amphtude modulatory signal the harmonic distortion of the sound field is relatively small compared to the double sideband amphtude modulated signal and the difference frequency wave acoustic source level is higher;(2) The difference frequency wave source level will increase rapidly with increase of input power of the parametric *** too much power may cause the power amplifier to produce nonlinear,thus the harmonic amphtude increase and the conversion efficiency will be lower.

关键词： acoustic parametric array nonlinear acoustics directional conversion efficiency

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THE MEASUREMENT OF ELASTIC CONSTANTS OF QUARTZ CRYSTAL BY RESONANT ULTRASOUND SPECTROSCOPY

THE MEASUREMENT OF ELASTIC CONSTANTS OF QUARTZ CRYSTAL BY RE...

引用

2012全国压电和声波理论及器件技术研讨会

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

The mechanical resonant response of a solid depends on its shape,density,and elastic *** describe here the instrumentation and computational methods for obtaining and analyzing the resonant frequency of very small(0.001 cm3)samples,and provide examples to demonstrate the utilization of the technique.A new material type with six independent elastic constants are formulated and tested with the *** study will leads to expansion of the software capability for the testing of novel materials.

关键词： Elastic constants Resonant Ultrasound Spectroscopy Quartz crystal Levenberg-Marquardt method

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DESIGN AND ANALYSIS OF A LONGITUDINAL PIEZOELECTRIC VIBRATION EXCITER

DESIGN AND ANALYSIS OF A LONGITUDINAL PIEZOELECTRIC VIBRATIO...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Zhi-qiang LI Xi-ping MO Yao-zong PAN Yong-ping LIU Institute of Acoustics Chinese Academy of Sciences University of Chinese Academy of Sciences

This paper is about the analysis and design of a longitudinal piezoelectric vibration exciter,which is required to produce forces that are more than 10 N from 100 Hz to *** device consists of three main parts- the rear plate,driving element and working *** Circuit Method(ECM in short) and Finite Element Analysis(FEA in short) are used to choose the material and size of each *** analyzing the frequency-force spectra of FEA models with different sizes and working loads,the structure of the longitudinal piezoelectric vibration exciter is finally *** from fulfilling the basic requirement,it can also be effectively used at frequencies more than 2 kHz.

关键词： Equivalent circuit method Finite element analysis Piezoelectric vibration exciter

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THE DESIGNING AND MANUFACTURING OF 1MHZ PIEZOELECTRIC MICRO-MACHINED ULTRASONIC TRANSDUCER

THE DESIGNING AND MANUFACTURING OF 1MHZ PIEZOELECTRIC MICRO-...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Zhi-qun SUO Zhen-hong HAO Dong-hai QIAO Institute of Acoustics Chinese Academy of Sciences

This paper has designed a new type of high frequency Piezoelectric Micro-machined Ultrasonic Transducer(PMUT) array in multi-units and parallel connection,based on sacrificial layer *** prepared the PMUT whose resonant frequency reached 1 MHz and studied on the process that the released sacrificial layer applied on the PMUT *** measured the admittance frequency response curve of the PMUT,whose resonant frequency was 1.14 MHz,in line with expected *** implemented the PMUT's transceiver *** the test,the receiving sensitivity of the PMUT in 1MHz was-255 dB(ref 1 V/uPa),the acoustic pressure output was 131.2 dB(ref 1 μPa·m/V),and the-3 dB band was about 68%.

关键词： Piezoelectric ZnO Film Piezoelectric Micro-machined Ultrasonic Transducer(PMUT) Micro-Electro-Mechanical Systems(MEMS)

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SH-SAW PROPAGATION IN A PIEZOELECTRIC STRUCTURE WITH VISCOELASTIC LAYER

SH-SAW PROPAGATION IN A PIEZOELECTRIC STRUCTURE WITH VISCOEL...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Jing CUI Jian-ke DU Ting-feng MA Ji WANG Department of Engineering Mechanics Ningbo University

An analytical approach is taken to investigate shear horizontal surface acoustic wave propagation in viscoelastic/piezoelectric structure,where a viscoelastic material thin layer is bonded to a semi-infinite piezoelectric *** analytical solution of dispersion relations are obtained for electrically open and shorted boundary *** phase velocity,displacement and stresses are calculated and discussed in *** effect of the viscous coefficient on the properties of the SH-SAW are figured and presented.

关键词： Shear horizontal waves Piezoelectric Viscoelastic Attenuation

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STUDYING THE TRANSDUCER WITH PMMA/ALUMINIUM COMPOSITE HEAD BY FINITE ELEMENT METHOD

STUDYING THE TRANSDUCER WITH PMMA/ALUMINIUM COMPOSITE HEAD B...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Hui-sheng LIU Xi-ping MO Institute of Acoustics Chinese Academy of Sciences University of the Chinese Academy of Sciences

In order to enhance the quality of underwater acoustic communication,it is often used matching layer technique to improve the bandwidth performance of the transducer,But it is not easy to find the appropriate matching layer material because of no suitable material in nature,most of which is got by artificial synthesis and keeping it with an acoustic uniformity is also a painful *** approach is given by Using PMMA/Aluminum(Al)composites head to improve the transmitting performance of the *** the finite element method,two types of the PMMA/Al composite head Langevin transducers are studied,including the vibration modes of the transducers in air and the transmitting voltage response of the transducers in water Influenced by the change of the geometry and material parameters of the composite *** finite element results show that the transducer bandwidth is significantly increased by using the new structure of the radiation head.

关键词： Transducer Broadband Matching layer PMMA

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MECHANISM ON ENERGY TRANSMISSION CONTROL IN BEAMS BASED ON A PIEZOELECTRIC TRANSDUCER

MECHANISM ON ENERGY TRANSMISSION CONTROL IN BEAMS BASED ON 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： Tian-zhu XU Zhen-yu HUANG Hai-li LIU Department of Instrument Science and Engineering Shanghai Jiao Tong University

In a beam-like structure,which acts as a vibration transmission path,transmitted energy can be effectively suppressed by employing an active *** energy transmission control can also be achieved at a certain frequency band without external energy by attaching a mechanical system,which may be composed with piezoelectric transducers,on the beam.A mass-spring attachment is modeled to investigate the relationship between the mechanical impedance and the working ***,the relationship between the working bandwidth and circuit parameters of the piezoelectric transducer is developed to show the feasibility of adjusting the working bandwidth.A case study of a passive system called as dog-bone structure was carried out to show that control range can be expanded by changing the dimension of the *** addition,the piezoelectric constant and capacity also determine the control performance.

关键词： Energy transmission Piezoelectric transducer Vibration control Wave theory

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STUDY ON A HIGH SENSITIVITY TANGENTIAL POLARIZED ACOUSTIC-PRESSURE HYDROPHONE

STUDY ON A HIGH SENSITIVITY TANGENTIAL POLARIZED ACOUSTIC-PR...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Hu ZHANG Qi LI Hong-juan CHEN Wen-zhi WANG Science and Technology on Underwater Acoustic Laboratory Harbin Engineering University

In this paper,the cylindrical PZT acoustic-pressure hydrophone has been *** on the analysis of cylindrical piezoelectric ceramic pipe free vibration and statically receiver theory,the sensitivity of hydrophones covered with plate,whose have three different polarization models,can be *** comparison,the tangential polarized ceramic pipe has the relatively high sensitivity,and at the same time,the hydrophone sample has been fabricated based on the finite element *** experimental results show that the working frequency band of hydrophone sample is 30 Hz-40 kHz,the average acoustic pressure sensitivity is about-182 dB within 30 Hz-10 *** are some difference in resonance frequency and the sensitivity between the result of simulation and test because of the simplification of structure in simulation.

关键词： High sensitivity Pressure hydrophone Tangential polarization

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LARGE TIME-BANDWIDTH PRODUCT ULTRASOUND GENERATION BY DRIVING PIEZOELECTRIC TRANSDUCER

LARGE TIME-BANDWIDTH PRODUCT ULTRASOUND GENERATION BY DRIVIN...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Han ZHANG Xiao-min WANG Jie MAO Ming-xuan LI Guo-xuan LIAN Zhi-wu AN Institute of Acoustics Chinese Academy of Sciences

Based on the Mason equivalent circuit,a theoretical model of ultrasonic signal generated by controlling the excitation signal has been *** TBWP(time-bandwidth product) ultrasonic signals can be generated by driving a piezoelectric transducer with modified LFM(linear frequency modulation) *** performances are obtained in the waveform,bandwidth and linear time-frequency *** results show that better axial resolution and higher power are achieved *** than twice the amplitude of the echo from the bottom is received by the large TBWP signal over the conventional pulse-echo method,when detecting the layered structure with a high attenuation rubber block and a thin aluminum plate bonding together.

关键词： Piezoelectric transducer Large time-bandwidth product Modified linear frequency modulation signal

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