• Title/Summary/Keyword: Piezoelectric Material

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Inversion of Material Coefficients for Numerical Analysis of Piezoelectric Actuators Using a Three-Dimensional Finite Element Method

  • Joo, Hyun-Woo;Lee, Chang-Hwan;Park, Jong-Seok;Jung, Hyun-Kyo
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.3B no.2
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    • pp.67-73
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    • 2003
  • In this paper, the impedance of a piezoelectric transducer is calculated using the three-dimensional finite element method. The validity of numerical routine is confirmed experimentally. Using this numerical routine, the effects of material coefficients on piezoelectric actuators characteristics are analyzed. The material constants, which make significant effects, are selected and the relations between material constants are studied. Using these processes, three variables of material constants for a piezoelectric transducer are selected and the design sensitivity method is adopted as an inversion scheme. The validity of the inversion scheme for a piezoelectric transducer is confirmed by applying the proposed method to the sample piezoelectric transducer.

Electric and mechanical properties of $ZrO_2$ reinforced Piezoelectric Ceramics ($ZrO_2$ 첨가된 압전 복합체의 전기-기계 특성)

  • Jeong, Soon-Jong;Kim, Min-Soo;Lee, Dae-Su;Park, Eon-Cheol;Song, Jae-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2006.06a
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    • pp.333-334
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    • 2006
  • The objective of this study is to fabricate a piezoelectric composite consisting of a piezoelectric ceramic and a high toughness material and to evaluate their electromechanical properties for high force actuator applications. The mixture of the piezoelectric material, PMNZT, and high toughness material, $ZrO_2$, exhibited high piezoelectric properties as well as good mechanical fracture resistance. Up to 2 vol% of $ZrO_2$ in PMNZT matrix, piezoelectric $d_{33}$ coefficient was above 400 pC/N, being 80% of that for the original PMNZT, and the toughness showed twice of the PMNZT. When the volume fraction of the $ZrO_2$ was above 5%, however, the piezoelectric coefficient became abruptly decreased and it approached 20% of value for the PMNZT.

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Performance Evaluation for Piezoelectric Unimorph Actuator with Stress Distribution (응력 분포에 따른 압전 유니모프 작동기의 성능 평가)

  • Lee, Jong-Won;Kang, Lae-Hyoung;Han, Jae-Hung;Jung, Sang-Jun;Ko, Han-Young
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2008.04a
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    • pp.127-131
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    • 2008
  • This paper deals with the performance evaluation of piezoelectric unimorph actuator. In the unimorph design, the thickness ratio of substrate to piezoelectric material and the elastic modulus ratio of substrate to piezoelectric material are important parameters. There exists only one structural configuration that satisfies the optimal condition among them, and actuators using that configuration exhibit better actuating displacements. Another design parameter is the piezoelectric coefficient which can be improved due to the induced tensile stress and voltages. The application of the tensile stress to the piezoelectric material makes it get higher piezoelectric coefficient and the total displacement performance of the unimorph actuator is improved. Finally, the piezoelectric actuator system with spring elements is fabricated and it shows higher actuating displacement capability.

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Optimal Design of a MEMS-type Piezoelectric Microphone (MEMS 구조 압전 마이크로폰의 최적구조 설계)

  • Kwon, Min-Hyeong;Ra, Yong-Ho;Jeon, Dae-Woo;Lee, Young-Jin
    • Journal of Sensor Science and Technology
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    • v.27 no.4
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    • pp.269-274
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    • 2018
  • High-sensitivity signal-to-noise ratio (SNR) microphones are essentially required for a broad range of automatic speech recognition applications. Piezoelectric microphones have several advantages compared to conventional capacitor microphones including high stiffness and high SNR. In this study, we designed a new piezoelectric membrane structure by using the finite elements method (FEM) and an optimization technique to improve the sensitivity of the transducer, which has a high-quality AlN piezoelectric thin film. The simulation demonstrated that the sensitivity critically depends on the inner radius of the top electrode, the outer radius of the membrane, and the thickness of the piezoelectric film in the microphone. The optimized piezoelectric transducer structure showed a much higher sensitivity than that of the conventional piezoelectric transducer structure. This study provides a visible path to realize micro-scale high-sensitivity piezoelectric microphones that have a simple manufacturing process, wide range of frequency and low DC bias voltage.

Modeling and Analysis of Ultrasonic Transducer with Single Crystal Piezoelectric Material (압전단결정을 이용한 초음파 탐촉자 모델링 및 해석)

  • Kwon, Byung-Jin
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2014.10a
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    • pp.579-580
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    • 2014
  • In this research, modeling and analysis of an ultrasonic transducer composed of single crystal piezoelectric material(PMN-28PT) are conducted with FEM in reference with that composed of piezoelectric ceramic(PZT-4). Acoustic performances of the ultrasonic transducer are compared with magnitude, phase of impedance and trasmitting voltage response according to the type of piezoelectric materials.

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Finite Element Analysis of A Piezoelectric Actuator (압전 작동기 거동해석을 위한 유한요소 모사)

  • Lee, Heung-Shik;Cho, Chong-Du
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.1401-1406
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    • 2003
  • Mechanical behavior of a piezoelectric actuator is studied as a preceding research for the manufacturing of three-dimensional micro-structures. It is needed to examine the simulation of a piezoelectric actuator according to applied direction of voltage, by researching displacement characterization of piezoelectric material through piezoelectric theory. To this end, finite element modeling is employed to study the response of a piezoelectric material under the various input voltages. Where the actuator is simulated by use of ANSYS. To avoid direct contact piezoelectric material with working fluid, silicon, polymer, etc., the actuator is modeled with nickel fixed diaphragm.

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A Study on the Energy Harvesting Using Piezoelectric Material (압전 소자를 이용한 에너지 회수에 관한 연구)

  • Park, Jong-Soo;Lee, Young-Il;Nam, Yoon-Su
    • Journal of Industrial Technology
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    • v.25 no.B
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    • pp.141-147
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    • 2005
  • A target of this paper is to get some elementary experimental data on the energy harvesting using a piezoelectric material. A THUNDER series piezo material (TH7-R), which has been developed by NASA engineer is selected for this study. In order to provide a mechanical energy to the piezoelectric material, a mechanical motion vibrator and its driving electronics are designed. Using a simple PWM control, the excitation frequency of vibrating mechanical motion is varied. The generated electric power as a function of the excitation frequency is monitored and analyzed. This initial experiment shows a possible energy source using a piezoelectric material for the application to low-power consumed small electronic devices such as RFID, MEMS, and etc.

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Crack Analysis of Piezoelectric Material Considering Bounded Uncertain Material Properties

  • Kim, Tae-Uk;Shin, Jeong-Woo
    • International Journal of Aeronautical and Space Sciences
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    • v.4 no.2
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    • pp.9-16
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    • 2003
  • Piezoelectric materials are widely used to construct smart or adaptive structures. Although extensive efforts have been devoted to the analysis of piezoelectric materials in recent years, most researches have been conducted by assuming that the material properties are fixed and have no uncertainties. Intrinsically, material properties have a certain amount of scatter and such uncertainties can affect the performance of component. In this paper, the convex modeling is used to consider such uncertainties in calculating the crack extension force of piezoelectric material and the results are compared with the one obtained via the Monte Carlo simulation. Numerical results show that crack extension forces increase when uncertainties considered, which indicates that such uncertainties should not be ignored for reliable lifetime prediction. Also, the results obtained by the convex modeling and the Monte Carlo simulation show good agreement, which demonstrates the effectiveness of the convex modeling.

Omni-directional piezoelectric actuator using mixed mode (혼합 모드를 이용한 전방향성 초음파 액추에이터)

  • Jung, Woo-Suk;Kang, Jhong-Yun;Song, Hyun-Chul;Yoon, Seok-Jin
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.11a
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    • pp.299-299
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    • 2007
  • This paper presents an omni-directional piezoelectric actuator which utilizes only one actuator. The actuator has a simple structure of cone type consists of two piezoelectric ceramics of ring type and electrodes divided four segments and a stainless steel body. To find the optimal operating condition of the actuator, the frequency characteristics of the actuator are analyzed by ATILA, FEM and measured by Impedance Analyzer. We have also developed a stage using the omni-directional actuator and an actuator driver circuit to create four sinusoidal waves with a variable frequency and phase difference.

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Investigation of Electrical Properties & Mechanical Quality Factor of Piezoelectric Material (PZT-4A)

  • Butt, Zubair;Anjum, Zeeshan;Sultan, Amir;Qayyum, Faisal;Khurram Ali, Hafiz Muhammad;Mehmood, Shahid
    • Journal of Electrical Engineering and Technology
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    • v.12 no.2
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    • pp.846-851
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    • 2017
  • Piezoelectricity is the capability of a piezoelectric material to change mechanical energy into electrical energy. The determination of electrical and mechanical properties plays a significant role in characterizing the piezoelectric material. The energy losses characteristics of piezoelectric material can be described by mechanical quality factor. In this paper, the output voltage and mechanical quality factor of Lead Zirconate Titanate (PZT-4A) piezoelectric material is determined under various resistance and loading conditions by using the test setup. The commercial FEM software ABAQUS is used to analyze the performance of piezoelectric material under static loading conditions. It is observed that these properties affect the performance of a material particularly in the designing of smart structures. The experimental results are partially compared to the simulation values.