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A CAN METHOD TO IMAGE THE QUANTITATIVE BONDING STRENGTH AT THE BONDED SOLID-SOLID INTERFACE

A CAN METHOD TO IMAGE THE QUANTITATIVE BONDING STRENGTH AT T...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Jian-jun CHEN De ZHANG Yi-wei MAO Institute of Acoustics Key Laboratory of Modern AcousticsNanjing University

As well known,when a longitudinal wave propagates through an interface with micro-cracks and micro-defects between solids,the contact acoustic nonlinearity(CAN) will be generated dramatically and the nonlinear parameter can be used to contour the bonding state of the *** the contour can only show the relative state of bonding strength and can not be used to judge weather the multilayered composite materials in use is safe because the safe judgment is not by the relative state while by the absolute value of the bonding *** characterization of quantitative bonding strength at the interface is very important for judging a multilayered material in safe *** this paper,how to get the quantitative bonding strength from the CAN parameter is *** the vibration amplitude of incident focusing wave at the bonded interface was calculated,the standard bonding strength with complete bonding state was established by tension test and CAN parameter is calibrated,the quantitative imaging of the bonding strength is obtained by CAN microscope in *** the imaging,the positions with weak bonding strength could be easily located,which can be used to decide whether the material could be employed continuously.

关键词： Bonding strength Quantitative imaging Contact Acoustic Nonlinearity

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RESEARCH ON LOCKING DEVICE DRIVEN BY ULTRASONIC MOTOR FOR MAGNETIC BEARING FLYWHEEL

RESEARCH ON LOCKING DEVICE DRIVEN BY ULTRASONIC MOTOR FOR MA...

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2012全国压电和声波理论及器件技术研讨会

作者： Xiao-niu LI Sheng-qiang ZHOU Zhi-yuan YAO State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics

In this study,taking the advantage of ultrasonic motors,a locking device driven by ultrasonic motor for magnetic bearing flywheel has been manufacture and evaluated.A locking device is used to eliminate the gap between the rotor and the stator of magnetic bearing flywheel in order to prevent it from shock and *** the present locking devices driven by initiating explosive device or magnetic motor have the disadvantages such as high,shock,large size,and heavy *** system of locking device includes mechanical structure and motion *** driving component of mechamcal structure apphes a traveling rotary wave ultrasonic motor(TRUM).The transmission employs worm gear so as to drive the executive *** the flywheel is *** power input of the ultrasonic motor is stable and the temperature rise of ultrasonic motor is 4°*** force of actuated clutch is 17.1N along with the *** the locking device has a highly-efficient locking performance.

关键词： Ultrasonic motor Magnetic bearing flywheel Locking device Motion control

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CORRECTION FACTORS FOR MINDLIN PLATE EQUATIONS WITH THE CONSIDERATION OF STIFFNESS AND MASS EFFECTS OF ELECTODES FOR SC-CUT QUARTZ CRYSTAL PLATES

CORRECTION FACTORS FOR MINDLIN PLATE EQUATIONS WITH THE CONS...

引用

2012全国压电和声波理论及器件技术研讨会

作者： Gui-jia CHEN Ji WANG Wen-jun WANG Rong-xing WU Ting-feng MA Jian-ke DU Piezoelectric Device Laboratory School of Mechanical Engineering and MechanicsNingbo University

Mindlin plate theory has been playing a vital role in the analysis of high frequency vibration of quartz crystal resonators,since the coupled equations with infinite number of vibration modes have been truncated to retain essential ones with strong couplings for simplified analysis,and correction factors have been introduced to ensure exact solutions at cut-off frequencies as part of the validation *** must be made at the cut-off frequency with stiffness and mass effects of electrodes considered in the plate equations,but correction factors are different between the AT- and SC-cut quartz *** systematic study of correction factors is readily available to the analytical equations with selected modes of strong couplings,and equally convenient for the implementation of the finite element analysis with the Mindlin plate equations.

关键词： Mindlin plate equations Correction factors Stiffness Mass SC-cut quartz crystal

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CRACK DETECTION OF BEAM-STRUCTURES BASED ON TRANSIENT WAVES

CRACK DETECTION OF BEAM-STRUCTURES BASED ON TRANSIENT WAVES

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2012全国压电和声波理论及器件技术研讨会

作者： Ji-qing JIANG Wei-qiu CHEN Gui-ru YE Department of Civil Engineering Zhejiang University City College Department of Engineering Mechanics Zhejiang University Department of Civil Engineering Zhejiang University

A method for crack detection in beam-structures is developed based on the transient waves under arbitrary external *** rotational springs are introduced for modeling cracked sections in a Timoshenko beam,and the wave responses of the perfect and cracked beams are calculated accurately by the reverberation-ray matrix *** it is hard to identify cracks from the wave responses directly,the Hilbert-Huang transform is employed to analyze the dynamic *** examples show that extra wavecrests can be observed from the Hilbert spectrum of the cracked beam when compared with the perfect *** extra wavecrests are found to be generated by waves scattered from the cracked *** location of the crack can then be determined according to the wave speed and possible propagation path.

关键词： Cracked beam Transient wave Damage detection Reverberation-ray matrix method Hilbert-Huang transform

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GROWTH HABITS AND HIGH TEMPERATURE PROPERTIES OF LANGATATE SINGLE CRYSTAL

GROWTH HABITS AND HIGH TEMPERATURE PROPERTIES OF LANGATATE S...

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2012全国压电和声波理论及器件技术研讨会

作者： Xiao-niu TU Yan-qing ZHENG Hai-kuan KONG Yi-fan TU Kai-nan XIONG Er-wei SHI Shanghai Institute of Ceramics Chinese Academy of Sciences

This paper shows that high quality LGT single crystals with the size of 2" were grown by Czochralski method along different *** facets and the solid-liquid interface during crystal growth process were investigated,and flat interface was obtained by adjusting the rotation rate.X-cut wafers were used to test frequency constant,resistivity,piezoelectric constant and crystalline *** results indicate that frequency constant value was around 2.77MHz-mm with a vitiation of 0.2% along the whole crystal;the resistivity of top part and bottom part both higher than 10～7Ohm·cm at 500 ℃;piezoelectric coefficient(d) was 7.0 pC/N;diffraction angle is 22.3228° and the Ml width at half maximum（fwhm） value is 33.5 *** all,the LGT crystal was in high quality and high homogeneous,can be used to high temperature acoustic wave devices and sensors in applications.

关键词： Langatate SPAWDA High temperature Resistivity Frequency

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DESIGN OF TEMPERATURE SENSOR ARRAY IN SMART ELECTRIC GRID BASED ON SAW RESONATORS

DESIGN OF TEMPERATURE SENSOR ARRAY IN SMART ELECTRIC GRID BA...

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2012全国压电和声波理论及器件技术研讨会

作者： Yu-lin HAN Zhen LI Zhen-wei QI Yue HU Bo-quan LIU Tao HAN Ji WANG School of Electronic Information and Electrical Engineering Shanghai Jiaotong University XJ Group Corporation Piezoelectric Device Laboratory Ningbo University

The sensor array with six sensors working at the frequency range of 429-436 MHz is designed and *** temperature sensitivity can be accurately controlled by the metallization thickness of the resonator on quartz substrate to keep the temperature-induced frequency shifts of each sensor within a limited bandwidth over a wide operating temperature ranging from-40℃ to +150℃.The thermal parameters of sensor encapsulation are optimized according to the high voltage switchgear *** order to meet the real-time requirement of sensor array measurement,discrete Hartley Transform(DHT) and the method of fast searching center frequency of sensors by comparison of I/Q and interrogation signals are used to reduce the query time,greatly improving the efficiency of polling of the sensor *** measurement uncertainty of the practical SAW temperature sensor is less than 1 ℃,and the sensitivity of sensor is up to 4KHz/℃.

关键词： SAW Smart electric grid Temperature Sensor array

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FINITE DIFFERENCE TIME DOMAIN ANALYSIS OF TWO-DIMENSIONAL PIEZOELECTRIC PHONONIC CRYSTALS

FINITE DIFFERENCE TIME DOMAIN ANALYSIS OF TWO-DIMENSIONAL PI...

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2012全国压电和声波理论及器件技术研讨会

作者： Yi-yu ZHAO Hong-lang LI Wei LUO Jiang-bo WEI Yong LIANG Shi-tang HE Acoustic Micro-electric Mechanical system Institute of acousticsChinese academy of sciences Dept.of Electronic Science & Technology Huazhong University of Science & Technology School of Optoelectronics Beijing Institute of Technology

Phonemic crystals（PCs） have promising band gaps,in which Surface Acoustic Wave（SAW） propagating is *** numerical methods have already been developed and applied to analyze piezoelectric PCs,most of them have various disadvantages,as they cannot calculate the transmission characteristic of the limited structure or cannot provide the propagation process for SAW in time *** finite-difference time-domain（FDTD） technique solving these problems is adopted to analyze the piezoelectric characteristics of *** in the PCs is studies by experience with direct generation and detection of SAW using interdigital transducers（IDT's）.The simukticin data agrees with the measurement *** the FDTD method is an effective method of simulating piezoelectric PCs structure in which a square array of parallel cylindrical aluminum placed on a 128° YX LiNbO substrate.

关键词： Piezoelectric PCs FDTD SAW IDT's

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A NOVEL APPROACH TO SIMULATE LOW-LOSS SURFACE ACOUSTIC WAVE DEVICES USING DISPERSIVE COM PARAMETERS

A NOVEL APPROACH TO SIMULATE LOW-LOSS SURFACE ACOUSTIC WAVE ...

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2012全国压电和声波理论及器件技术研讨会

作者： Hao WANG Wei-biao WANG Bo SU Jian WANG Hao-dong WU Yong-an SHUI Key Laboratory of Modem Acoustics(MoE) Institute of AcousticsNanjing University The 55th Research Institute of China Electronic Technology Group Corporation School of Electronic Science and Engineering Nanjing University

This paper describes a novel approach to extract dispersive coupling-of-modes(COM) parameters for simulating low-loss surfece acoustic wave(SAW) devices.A finite periodic grating is in *** finite FEM/BEM tool,the field(mechanical displacements and electric potential) distributions could be calculated at every *** the field contributed by SAW should be separated from the total field by Source Regeneration *** both short-circuited and open-circuited gratings,all the dispersive COM parameters can be *** particular,the dispersive reflection coefficient and propagation velocity are obtained *** an example,a synchronous one-port resonator is simulated using dispersive COM parameters extracted by the method mentioned in this *** electrical property of the resonator agrees well with the result simulated by finite FEM/BEM,which verifies this approach is accurate and effective.

关键词： Surface acoustic wave Low-loss devices Coupling-of-modes model Dispersive COM parameters

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EXACT ANALYSIS OF THE DYNAMIC PROPERTIES OF 2-2 CEMENT BASED PIEZOELECTRIC ACTUATOR CONSIDERING POLING LAYER EFFECT

EXACT ANALYSIS OF THE DYNAMIC PROPERTIES OF 2-2 CEMENT BASED...

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2012全国压电和声波理论及器件技术研讨会

作者： Tao-tao ZHANG Kun MA Zhi-fei SHI School of Transportation Science and Engineering Beihang University School of Civil Engineering Beijing Jiaotong University

Cement based piezoelectric composites can have not only low frequency,but also good compatibility with the concrete,which is perfect for measuring the properties of the civil engineering ***,up till now there have been only a few literatures dealing with the theoretical analysis of cement based piezoelectric composite,especially for the 2-2,0-3 and 1-3 cement based *** on the general theory of elasticity and the dynamic theory of piezoelectricity,the dynamic behavior of 2-2 cement-based piezoelectric actuator is investigated under the harmonic electric *** actuator consists of 2 cement layers and 1 piezoelectric *** the poling layers between the cement layer and the piezoelectric layer as the elastic layer,the exact solutions of the mechanical and electrical fields of the actuator are obtained by utilizing Airy stress function ***,the curves of displacement or stress along axial direction and other conclusions are given and ***,it can be seen that the analytical model estabhshed in this paper works very well,which could benefit the design of this kind of cement-based smart devices.

关键词： 2-2 cement based Piezoelectricity Dynamic Exact solutions Actuator

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MINDLIN PLATE EQUATIONS FORTHE THICKNESS-SHEAR VIBRATIONS OF CIRCULAR ELASTIC PLATES

MINDLIN PLATE EQUATIONS FORTHE THICKNESS-SHEAR VIBRATIONS OF...

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2012全国压电和声波理论及器件技术研讨会

作者： Wen-jun WANG Ji WANG Gui-jia CHEN Ting-feng MA Jian-ke DU Piezoelectric Device Laboratory School of Mechanical Engineering &Mechanics Ningbo University

The systematic derivation of Mindlin plate equations has been fully presented in the monograph of Mindlin and some of his *** applications followed are focused on the straight-crested wave in rectangular quartz crystal plates due to the necessity in the design of rectangular type resonators and relative simplicity of *** applications concerning circulate plates vibrating at the thickness-shear mode or the shear effects are analyzed by transforming the relatively simple equations of the thickness-shear and flexural modes to the cylindrical coordinates with a simple procedure,as we can find from a few papers and *** systematic derivation by following a rigorous procedure of Mindlin plate equations are not presented before,and subsequent applications to coupled vibrations of circular plates at thickness-shear modes have not be studied with the Mindlin plate equations for circular type quartz crystal ***,vibrations of overtone modes with more coupled displacements require a systematic derivation which is more clear with the cylindrical coordinates.

关键词： Elastic plates Mindlin plate theory Vibration Circular plates

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