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检索条件"任意字段=2011年全国压电和声波理论及器件应用研讨会"

共 192 条记录，以下是141-150 订阅

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STUDY OF THE NONLINEAR EFFECTS ON TRANSIENT PROCESSES IN AT-CUT QUARTZ RESONATORS

STUDY OF THE NONLINEAR EFFECTS ON TRANSIENT PROCESSES IN AT-...

引用

2014年全国压电和声波理论及器件应用研讨会

作者： Nian LI Zheng-hua QIAN Jia-shi YANG State Key Laboratory of Mechanics and Control of Mechanical Structures College of Aerospace EngineeringNanjing University of Aeronautic and Astronautic Department of Mechanical and Materials Engineering University of Nebraska-Lincoln

Background,Motivation and Objective Piezoelectric crystals are widely used to make acoustic wave resonators as frequency standards for frequency generation and operation with broad applications in,e.g.,time-keeping,te... 详细信息

关键词： Quarts resonator Thickness-shear mode Transient processes Nonlinear effect

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OPTIMUM PIEZOELECTRIC CRYSTAL CUTS OF THE MONOCLINIC BIBO SINGLE CRYSTALS

OPTIMUM PIEZOELECTRIC CRYSTAL CUTS OF THE MONOCLINIC BIBO SI...

引用

2014年全国压电和声波理论及器件应用研讨会

作者： Fa-peng YU Qing-ming LU Shu-jun ZHANG Xu-tang TAO Xian ZHAO State Key Laboratory of Crystal Materials and Institute of Crystal Materials Shandong University School of Chemistry and Chemical Engineering Shandong University Materials Research Institute Pennsylvania State UniversityUniversity Park

Background and Motivation After the discovery of piezoelectric effect in 1880,various piezoelectric devices have been designed and fabricated,such as resonators,filters,transducers,actuators and sensors *** the developments of techniques,high temperature sensors are desired in many tech *** materials that are operational at elevated temperatures without failure are

关键词： BIBO Piezoelectric crystal Optimum crystal cuts

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USING ACOUSTIC LOGGING SIGNALS OF SEGMENTED BOND TOOL TO DETECT THE CEMENTING QUALITY

USING ACOUSTIC LOGGING SIGNALS OF SEGMENTED BOND TOOL TO DET...

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2014年全国压电和声波理论及器件应用研讨会

作者： Pei-xiao LI Xiu-mei ZHANG Wei-jun LIN State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of Sciences

＜正＞Background,Motivation and Objective In oil well operations,cement sheath is located between the casing and formation to provide zonal isolation through the life of a *** of cement sheath integrity is vital for a... 详细信息

关键词： 3D finite difference Acoustic logging Second interface Full wave logging

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COUPLING EFFECT IN ULTRASONIC LINEAR ARRAYS FABRICATED BY PIMNT SINGLE-CRYSTAL RECTANGULAR BEAMS

COUPLING EFFECT IN ULTRASONIC LINEAR ARRAYS FABRICATED BY PI...

引用

2014年全国压电和声波理论及器件应用研讨会

作者： Qing-Wen YUE Dong-xu LIU Ji DENG Xi-an WANG Xiang-Yong ZHAO Hao-Su LUO Key Laboratory of Inorganic Functional Materials and Devices Shanghai Institute of CeramicsUniversity of Chinese Academy of Sciences University of Chinese Academy of Sciences

Background,Motivation and Objective Recently,much attention has been paid to the relaxor ferroelectric single crystals for their ultrahigh piezoelectric *** quality and large size Pb(Mg1/3Nb2/3)O3-x Pb Ti O3(PMN-PT)si... 详细信息

关键词： coupling effect Relaxor ferroelectric single crystals PIMNT Ultrasonic linear array.

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ELASTIC WAVE PROPAGATION IN PIEZOELECTRIC SEMICONDUCTOR MULTILAYERS

ELASTIC WAVE PROPAGATION IN PIEZOELECTRIC SEMICONDUCTOR MULT...

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2014年全国压电和声波理论及器件应用研讨会

作者： Chun-li ZHANG Ling-li ZHANG Wei-qiu CHEN Department of Engineering Mechanics Zhejiang University

Piezoelectric semiconductors simultaneously exhibit strong electromechanical coupling effect and unique electric conductive behavior, and hence are useful for making novel electronic devices. In recent, Wurtzite structured piezoelectric semiconductors with one-dimensional nanostructures, film-substrate and layered structures have attracted increasing attentions due to their potential applications in electronic transport, field-effect transistors, sensors, nano-generators, flexible electronics optoelectronics and human-machine interfacing. Owing to the electromechanical coupling effect, the mechanical properties of piezoelectric semiconductors play a vital role in the device’s performance. However, it is very poor in studies on piezoelectric semiconductors from the mechanical point. In this contribution, we study acoustic wave propagations in piezoelectric semiconductor multilayers within the framework of linear continuum theory. The transfer matric method is employed to derive the dispersion equation under different boundary conditions. The effect of the charge density and conductivity on the dispersion frequency are systematically studied.

关键词： Piezoelectricity,semiconductor multilayers wave propagation

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SH WAVES IN THE CIRCUMFERENTIAL DIRECTION OF FGM CYLINDRICAL CURVED PLATES WITH INITIAL STRESSES

SH WAVES IN THE CIRCUMFERENTIAL DIRECTION OF FGM CYLINDRICAL...

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2014年全国压电和声波理论及器件应用研讨会

作者： Jiangong YU Bo ZHANG Xiaoming ZHANG School of Mechanical and Power Engineering Henan Polytechnic University

Because of the gradually changing material properties, functionally graded materials（FGM） have many advanced applications. Guided wave propagation in FGM structures attracted considerable research efforts for the purpose of the ultrasonic NDT＆E. But the limitation of manufacturing technology results in the existence of initial stresses in FGM structures. The influences of the initial stresses on the wave propagation in FGM structures must be paid enough attention. Based on "Mechanics of Incremental Deformations", the circumferential SH waves in FGM cylindrical curved plates with axially and radially initial stresses are investigated. The Legendre polynomial series method is used to solve the coupled wave equation with variable coefficients. Through numerical examples, the convergence of the polynomial method is discussed. The influences of initial stress on dispersion curves and stress distributions are investigated, respectively. Numerical results show that the curves of frequency vs initial stresses in both directions are not entirely linear and that the influence of the compressive stress on the SH wave is almost entirely contrary to that of the tensile stress. The influence of the radial initial stress is contrary to that of the axial initial stress both on dispersion curves and on displacement, stress distributions. The influence of the radial initial stress becomes stronger with the increasing of the mode order but the influence of the axial initial stress becomes stronger with the increasing of the wavenumber.

关键词： Initial stress functionally graded materials cylindrical curved plate SH wave dispersion curves.

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ANALYSIS OF DEFECT STATES OF TWO-DIMENSIONAL PHONONIC CRYSTALS BASED ON BOUNDARY ELEMENT METHOD

ANALYSIS OF DEFECT STATES OF TWO-DIMENSIONAL PHONONIC CRYSTA...

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2014年全国压电和声波理论及器件应用研讨会

作者： Feng-lian LI Yue-sheng WANG Chuanzeng ZHANG Gui-lan YU School of mechanical and engineering Beijing Information and Technology University Institute of Engineering Mechanics Beijing Jiaotong University Department of Civil Engineering University of Siegen School of Civil Engineering Beijing Jiaotong University

In analogy to photonic crystals, phononic crystals may exhibit complete band gaps in their transmission spectra where the propagation of acoustic or elastic waves is strictly forbidden in all directions. The complete band gaps could be engineered to provide a vibrationless environment for high precision mechanical systems in given frequency ranges. Understanding the full band structures is expected to lead to the design of new generations of sound shields, filters, transducers, refractive devices such as acoustic lenses and acoustic interferometers, etc. By breaking the periodicity of the systems, it is possible to create highly localized defect or guided modes within the acoustic band gaps, which are analogous to localized modes in a photonic crystal and to localized impurity states in a semiconductor. This makes the phononic crystals potential candidates for the design of elastic or acoustic wave guides. In the case of solid/solid systems, the existence of full band gaps and localized defect modes and the possibility of guiding waves have been investigated theoretically using the different methods. In the present paper, this boundary element method is extended to the calculation of the defect states in two-dimensional phononic crystals. We consider a 2D phononic crystal consisting of a square array. Both scatterers and matrix are homogeneous, isotropic and linear elastic solids. Due to the periodicity of the system, we can restrict our attention to a supercell. For the solid/solid system, when the binary components perfectly contact, the boundary conditions along the interface are that the displacements and the stresses are *** addition, the periodicity of the structures implies that any field quantity(e.g. the displacement, stress, pressure and their derivatives) should obey the following Bloch theorem. The Bloch theorem allows us to solve the problem in a supercell. We bulid the boundary integral equations of the matrix and every scatter. Then the boun

关键词： Boundary element method,Defect states,Phononic crystals

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大会组委会及承办单位欢迎辞

大会组委会及承办单位欢迎辞

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2011年全国压电和声波理论及器件应用研讨会

作者：樊建平中国科学院深圳先进技术研究院

欢迎大家来到年轻而富有激情的美丽海滨城市——深圳特区!全国压电和声波理论及器件应用研讨会是近年来发展迅速的跨学科、多领域交叉的学术交流活动,以压电器件的分析、设计和应用为背景,目标是促进理论与实践的更紧密结合,加快现代传... 详细信息

欢迎大家来到年轻而富有激情的美丽海滨城市——深圳特区!全国压电和声波理论及器件应用研讨会是近年来发展迅速的跨学科、多领域交叉的学术交流活动,以压电器件的分析、设计和应用为背景,目标是促进理论与实践的更紧密结合,加快现代传感技术的微型化和集成电路化发展,催生系列功能齐备甚至具备全新功能的压电声波器件。该研讨会在中国力

关键词：压电器件器件应用研讨会科学院先进技术研究院中国声学学会中国力学学会

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石英板厚度扭转模态声波滤波器分析

石英板厚度扭转模态声波滤波器分析

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2010年全国压电和声波理论及器件技术研讨会

作者：尹歆杜建科王骥杨嘉实 315211 浙江省宁波市风华路818号宁波大学压电器件技术实验室 Department of Engineering Mechanics University of Nebraska Lincoln NE 68588-0526 USA

本文研究了厚度扭转模态下的旋转Y切石英板振动问题.该板具有两对电极,其中一对接通输入电压,另一对输出信号,并与外电路连接.这种结构广泛应用于声波滤波器以及其他重要的压电器件,如谐振器、微量天平、压电质量传感器、压电陀螺仪、... 详细信息

本文研究了厚度扭转模态下的旋转Y切石英板振动问题.该板具有两对电极,其中一对接通输入电压,另一对输出信号,并与外电路连接.这种结构广泛应用于声波滤波器以及其他重要的压电器件,如谐振器、微量天平、压电质量传感器、压电陀螺仪、换能器等.本章将研究该结构的自由振动和受迫振动情况,以及谐振频率、能陷形式、输出电压.

关键词：声波滤波器石英晶体板厚度扭转模态振动分析

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压电介质中声波的时域有限差法正演模拟

压电介质中声波的时域有限差法正演模拟

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2010年全国压电和声波理论及器件技术研讨会

作者：于小利曹明罗中涌公勋章德 210093 近代声学教育部重点实验室南京大学声学所南京

本文基于时域有限差分方法对压电介质中的声波进行了数值分析.根据时域有限差分理论对压电材料的高斯方程和牛顿运动方程在空间和时间域进行了离散化,通过得到的差分方程可以直接得出声波传播的时域数值解.由于只考虑XZ平面,所以计算的... 详细信息

本文基于时域有限差分方法对压电介质中的声波进行了数值分析.根据时域有限差分理论对压电材料的高斯方程和牛顿运动方程在空间和时间域进行了离散化,通过得到的差分方程可以直接得出声波传播的时域数值解.由于只考虑XZ平面,所以计算的场量只包括3个应力分量,2个质点速度分量.本文还应用完全匹配层吸收边界条件来减少人为引入的反射.总结了用时域有限差分方法模拟压电介质中声波传播的流程.给出了声波在压电介质中传播的可视化图形.数值实验验证了上述计算方法的有效性.

关键词：压电介质声波分析时域有限差分法数值计算

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