Effect of thickness on the performance parameters of modified 1–3 piezoelectric composites
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Electromechanical coupling coefficient
Acoustic impedance
Piezoelectric accelerometer
This paper demonstrates the importance of three-dimensional (3-D) piezoelectric coupling in the electromechanical behavior of piezoelectric devices using three-dimensional finite element analyses based on weak and strong coupling models for a thin cantilevered piezoelectric bimorph actuator. It is found that there is a significant difference between the strong and weak coupling solutions given by coupling direct and inverse piezoelectric effects (i.e., piezoelectric coupling effect). In addition, there is significant longitudinal bending caused by the constraint of the inverse piezoelectric effect in the width direction at the fixed end (i.e., 3-D effect). Hence, modeling of these effects or 3-D piezoelectric coupling modeling is an electromechanical basis for the piezoelectric devices, which contributes to the accurate prediction of their behavior.
Bimorph
Piezoelectric accelerometer
Piezoelectric motor
Electromechanical coupling coefficient
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1-1-3 Piezoelectric composites made of piezoelectric ceramic, epoxy resin and silicone rubber were prepared by using the modified 'slice and fill' technique. The effect of the volume percentage of piezoelectric ceramic on the properties of the composite was analyzed by measuring the impedance curves, electromechanical coupling coefficients, and acoustic impedance values of the samples. The experimental results show that the change in the volume percentage of the epoxy has no effect on the piezoelectric properties of the composites, and it only affects the acoustic impedance (Z). For comparison, 1-3 piezoelectric composites with only piezoelectric ceramic and epoxy resin were prepared. The electromechanical coupling coefficient of the 1-1-3 piezoelectric composite is higher than that of the 1-3 composite, and also the acoustic impedance of 1-1-3 composite is lower than that of 1-3 composite. For the transducer array usage, the consistency and decoupling effect between elements in 1-1-3 composite and 1-3 composite are tested. The results indicate that the 1-1-3 composite is more suitable for designing high performance transducer array compared to the 1-3 composite.
Silicone rubber
Electromechanical coupling coefficient
Acoustic impedance
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Film materials and devices have been widely used in micro-electromechanical system(MEMS) system with the development of micromation,high sensitivity and integration of electronic devices.But the measurement methods for piezoelectric properties of piezoelectric thin films are very different from those of bulk materials.Two categories of measuring piezoelectric properties of piezoelectric thin films were introduced in this paper: direct measurement(including pneumatic pressure rig,cantilever method,laser interferometer method and laser Doppler vibrometer method)and indirect measurement(conventional impedance analyzer).The basic principle,measurement characterization,application status and problems were all illustrated in this paper,the advantages/disadvantages of these techniques were compared for piezoelectric applications and the future development of measurement characterization of piezoelectric thin films were predicted.
Piezoelectric accelerometer
Characterization
Electromechanical coupling coefficient
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To increase the ultrasonic intensity and power of a piezoelectric transducer, a cascaded piezoelectric ultrasonic transducer with the three sets of piezoelectric ceramic stacks is analyzed. The cascaded piezoelectric ultrasonic transducer consists of four metal cylinders and three sets of piezoelectric ceramic stacks in the longitudinal direction. In analysis, the electromechanical equivalent circuit of the cascaded piezoelectric ultrasonic transducer is obtained, as well as the resonance/anti-resonance frequencies equations. By means of an analytical method, when the position of piezoelectric ceramic stacks PZT-2/PZT-3 changes, the resonance/anti-resonance frequencies and the effective electromechanical coupling coefficient of the cascaded piezoelectric ultrasonic transducer have certain characteristics. Several prototypes of the cascaded piezoelectric ultrasonic transducer are manufactured. The experimentally measured resonance frequencies are in good agreement with the theoretical and simulated results. The cascaded piezoelectric ultrasonic transducer with three sets of piezoelectric ceramic stacks presented in this paper is expected to be used in the field of high power ultrasound.
Electromechanical coupling coefficient
Ultrasonic motor
Piezoelectric accelerometer
Piezoelectric motor
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Electromechanical coupling coefficient
Piezoelectric accelerometer
Resistive touchscreen
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This paper analyzes that the affection of multi-piezoelectric effect on performances of piezoelectric sensor including elastic constants, Poisson ratio, piezoelectric coefficient and energy conversion so on. The secondary converse piezoelectric effect by the beginning of the first positive piezoelectric effect decreases the deformation of piezoelectric sensor, elastic constants, energy of force-electric conversion and change Poisson ratio at the same time; the third positive piezoelectric effect decreases piezoelectric coefficient of piezoelectric sensor. This investigation of multi-piezoelectric effect on performances of piezoelectric sensor will provide the new method to improve sensitivity, force-electric conversion ratio and convertible precision.
Piezoelectric accelerometer
Poisson's ratio
Piezoelectric motor
Electromechanical coupling coefficient
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In this paper, an analytical model of a V-shape piezoelectric ultrasonic transducer is presented. The V-shape piezoelectric ultrasonic transducer has been widely applied to the piezoelectric actuator (ultrasonic motor), ultrasonic aided fabrication, sensor, and energy harvesting device. The V-shape piezoelectric ultrasonic transducer consists of two Langevin-type transducers connected together through a coupling point with a certain coupling angle. Considering the longitudinal and lateral movements of a single beam, the symmetrical and asymmetrical modals of the V-shape piezoelectric ultrasonic transducer are calculated. By using Hamilton–Lagrange equations, the electromechanical coupling model of the V-shape piezoelectric ultrasonic transducer is proposed. The influence of the coupling angle and cross-section on modal characteristics and electromechanical coupling coefficient are analyzed by the analytical model. A prototype of the V-shape piezoelectric ultrasonic transducer is fabricated, and the results of the experiments are in good agreement with the analytical model.
Electromechanical coupling coefficient
Ultrasonic motor
Piezoelectric motor
Piezoelectric accelerometer
Electromagnetic acoustic transducer
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Introduction Classification of Dielectric Materials Important Dielectric Parameters Electrostrictive Effect Piezoelectric Effect Pyroelectric Effect Ferroelectric Materials Poling Applications of Ferroelectric Materials Piezoelectric Characteristics Piezoelectric Coefficients Tensor Form of Piezoelectric Equations Independent Components of Piezoelectric, Elastic, and Dielectric Matrices Generator and Motor Actions of Piezoelectric Materials Strain versus Electric Field in Piezoelectric Materials Piezoelectric Coupling Coefficient k Dynamic Behaviour of a Piezoelectric Material Piezoelectric Materials Quartz Lead Zirconate Titanate (PZT) Fabrication of PZT Polymer Piezoelectric Materials Other Piezoelectric Materials Composite Piezoelectric Materials Engineering Applications of Piezoelectric Materials Gas Lighter Pressure Sensor Accelerometer Piezoelectric Gyroscope-Angular Rate Sensors Piezoelectric Microphone Piezoelectric Ultrasonic Transducers for Sound Navigation and Ranging (SONAR) Piezoelectric Tactile Sensor Energy Harvesting Piezoelectric Electronic Buzzer and Tweeter Piezoelectric Actuators Piezoelectric Motor Piezoelectric Micro Pump Piezoelectric Ultrasonic Drill Ultrasonic Cleaner Quartz Crystal Oscillator Quartz Crystal Balance Quartz Tuning Fork in Atomic Force Microscope Piezoelectric Transformer Nondestructive Testing (NDT) of Materials Using Ultrasonics Noise and Vibration Control Structural Health Monitoring Piezoelectric Sensors and Actuators in Smart Systems and Robots Medical Applications of Piezoelectric Materials Blood Pressure Monitor Piezoelectric Heartbeat Monitor Piezoelectric Tactile Sensor-Endoscopic Grasper and Minimal Invasive Surgical Instrument Piezoelectric Accelerometer-Monitoring Patient Activity and Detecting Tremors Piezoelectric Pump-Drug Delivery and Biomedical Analyses Ultrasonic Imaging Bone Density Measurement Using Ultrasound Ablation of Tumour Cells Using High-Intensity Focused Ultrasound (HIFU) Ultrasound for Drug Delivery Ultrasonic-Induced Transdermal Drug Delivery Phaco Emulsification-Cataract Surgery Therapeutic Ultrasound-Treatment of Injury, Muscular Pain, and Bone Fracture Modelling and Virtual Prototyping of Piezoelectric Devices Using Finite Element Software Tools Finite Element Method Theory of Coupled Field Finite Element Analysis for Piezoelectric Structure Introduction to FE Analysis of Piezoelectric Devices Using a Software Tool Examples of FE Analyses of Piezoelectric Devices
Piezoelectric accelerometer
Ultrasonic motor
Piezoelectric motor
Lead zirconate titanate
Electromechanical coupling coefficient
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Electromechanical coupling coefficient
Acoustic impedance
Piezoelectric accelerometer
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