• 제목/요약/키워드: Piezoelectric single crystal

검색결과 94건 처리시간 0.03초

Design and Vibratory Loads Reduction Analysis of Advanced Active Twist Rotor Blades Incorporating Single Crystal Piezoelectric Fiber Composites

  • Park, Jae-Sang;Shin, Sang-Joon;Kim, Deog-Kwan
    • International Journal of Aeronautical and Space Sciences
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    • 제9권2호
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    • pp.18-33
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    • 2008
  • This paper presents design optimization of a new Active Twist Rotor (ATR) blade and conducts its aeroelastic analysis in forward flight condition. In order to improve a twist actuation performance, the present ATR blade utilizes a single crystal piezoelectric fiber composite actuator and the blade cross-sectional layout is designed through an optimization procedure. The single crystal piezoelectric fiber composite actuator has excellent piezoelectric strain performance when compared with the previous piezoelectric fiber composites such as Active Fiber Composites (AFC) and Macro Fiber Composites (MFC). Further design optimization gives a cross-sectional layout that maximizes the static twist actuation while satisfying various blade design requirements. After the design optimization is completed successfully, an aeroelastic analysis of the present ATR blade in forward flight is conducted to confirm the efficiency in reducing the vibratory loads at both fixed- and rotating-systems. Numerical simulation shows that the present ATR blade utilizing single crystal piezoelectric fiber composites may reduce the vibratory loads significantly even with much lower input-voltage when compared with that used in the previous ATR blade. However, for an application of the present single crystal piezoelectric actuator to a full scaled rotor blade, several issues exist. Difficulty of manufacturing in a large size and severe brittleness in its material characteristics will need to be examined.

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

  • 권병진
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2014년도 추계학술대회 논문집
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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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PMN-PZT/Ni 자기-전기 복합체에서 단결정 압전 모드에 따른 자기장 감도 특성 (Magnetic-field Sensitivity of PMN-PZT/Ni Magnetoelectric Composite with Piezoelectric Single Crystal Mode Changes)

  • 박소정;;류정호
    • 센서학회지
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    • 제29권1호
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    • pp.45-50
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    • 2020
  • Magnetoelectric (ME) composites were designed using the PMN-PZT single crystal and Ni foils; the properties and magnetic-field sensitivities of ME composites with different piezoelectric vibration modes (i.e., 31, 32, and 36 modes that depend on the crystal orientation of the single crystal) were compared. In the off-resonance condition, the ME coupling properties of the ME composites with the 32 and 36 piezoelectric vibration modes were better than those of the ME composites with the 31 piezoelectric vibration mode. However, in the resonance condition, the ME coupling properties of the ME composites were almost similar, irrespective of the piezoelectric vibration mode. Additionally, in the off-resonance condition (at 1 kHz), the magnetic-field sensitivity of the ME composites with the 36 piezoelectric vibration mode was up to 2 nT and those of the ME composites with the 31 and 32 piezoelectric vibration modes were up to 5 nT. These magnetic-field sensitivities are similar to those offered by conventional high-sensitivity magnetic-field sensors; the potential of the proposed sensor to replace costly and bulky high-sensitivity magnetic field sensors is significant.

$LiNbO_3$단결정 성장 및 온도에 따른 압전 특성 평가 (Growth of $LiNbO_3$ single crystals and evaluation of the dependence of its piezoelectric properties on temperature)

  • 정화구;김병국;강길영;윤종규
    • 한국결정성장학회지
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    • 제6권2호
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    • pp.155-165
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    • 1996
  • Growth of $LiNbO_3$ single crystal by Czochralski method was carried out to study the piezoelectric effects. Piezoelectric coefficients and elastic compliances of the $LiNbO_3$ single crystal were determined by the resonance method of length-extentional mode of bar resonator from the room temperature up to $100^{\circ}C$. Two dielectric constants of $LiNbO_3$ were also determined by measuring the capacitance of the plate specimen. Measured constants were piezoelectric coefficients $d_{15},d_{22},d_{31},d_{33}$ elastic compliances $s^E_{11},s^E_{33},2s^E_{13}+2s^E_{44},s^E_{14}$ and dielectric constants $K^T_{11},K^T_{33}$. As temperature increased, elastic compliances changed very slowly while piezoelectric coeffiecients and dielectric constant $K^T_{33}$ changed very rapidly. Electromechanical coupling constant of zyw ($45^{\circ}C$)-bar was as high as 0.51 in room temperature and nearly constant up to $1000^{\circ}C$. The increase of piezoelectric coefficients was mainly due to the increase of dielectric permittivity.

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단결정 PMN-29PT 적층형 작동기: 제작과 성능 (A Single-crystal PMN-29PT Stack Actuator: Fabrication and Performance)

  • 박훈철;아디아타마 판지;이호용
    • 한국세라믹학회지
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    • 제50권6호
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    • pp.545-550
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    • 2013
  • Piezoelectric PMN-29PT single crystal multilayer actuators [100 $mm^2$ in cross section and 22 mm in length] are designed and fabricated by stacking square plates [$10{\times}10{\times}0.5(t)\;mm^3$] of PMN-29PT single crystals having a $d_{33}$ of about 1,500 pC/N. The characteristics of PMN-29PT multilayer actuators are compared with those of P-025.40P multilayer PZT ceramic actuators [490 $mm^2$ in cross section and 60 mm in length] produced by PI in Germany. Even though the total volume of the PMN-29PT single crystal multilayer actuator is only about 7.5% of that of the P-025.40P ceramic multilayer actuator, PMN-29PT single crystal multilayer actuators are expected to show very similar properties to P-025.40P ceramic actuators in terms of static stroke and blocking force. Therefore, on the basis of their smaller mass and volume compared to the conventional PZT ceramic multilayer actuators, piezoelectric PMN-29PT single crystal multilayer actuators have significant potential regarding the development of various high performance actuators for aerospace subsystems.

압전단결정(72PMN-28PT) 응용 수중음향 톤필츠 트랜스듀서 개발 (A Development of Underwater Acoustic Tonpilz Transducer with the Piezoelectric Single Crystal)

  • 권병진
    • 한국전기전자재료학회논문지
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    • 제29권9호
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    • pp.532-538
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    • 2016
  • In this paper, a underwater acoustic Tonpilz transducer with the piezoelectric single crystal(72PMN-28PT) is developed. The thickness and the number of piezoelectric elements are theoretically designed with the equivalent circuit analysis to have the desired resonance frequency. In order to compare the performances, a piezoelectric ceramic transducer is also manufactured and their electrical impedance, TVR (transmitting voltage response), RVS (receiving voltage response) and beam pattern are compared.

공진법을 이용한 PMN-PT 단결정의 탄성, 유전, 압전상수 측정 (Measurement of all the Elastic, Dielectric and Piezoelectric Properties of PMN-PT Single Crystals)

  • 이상한;이수성;노용래;이호용;한진호
    • 한국전기전자재료학회논문지
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    • 제17권1호
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    • pp.31-38
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    • 2004
  • PMN-PT, a piezoelectric single crystal, has many useful applications such as sensors and actuators. In this paper, all the elastic, piezoelectric, and dielectric constants of the PMN-32%PT single crystals were measured by the resonance method. For the rhombohedral symmetry, a total of twelve independent material constants were measured such as six elastic compliance constants at constant electric field, two dielectric constants at constant stress, and four piezoelectric constants d. Seven sets of crystal samples of each different geometry were prepared for the measurement of length-thickness extensional, thickness extensional, radial, length extensional and thickness shear modes of vibration, respectively. In order to check the validity of the measurement, experimental impedance spectrum of the PMN-PT crystal was compared with numerical data spectrum calculated with the measured material constants. The good agreement between the two spectra confirmed validity of the results in this paper.

Tonpilz 트랜스듀서의 성능에 미치는 압전소재의 영향 (Effects of piezoelectric material on the performance of Tonpilz transducer using finite element method)

  • 서진원;최균;이호용
    • 한국결정성장학회지
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    • 제26권4호
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    • pp.139-144
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    • 2016
  • Tonpilz 트랜스듀서의 거동에 미치는 압전 소재의 형상과 크기의 효과에 대하여 유한요소법을 통한 컴퓨터 모사를 통하여 연구하였다. 도넛 형태의 압전체의 직경과 높이 그리고 쌓아올린 stack의 수를 변수로 고려하였고 최종적으로 소재 자체를 특성이 뛰어난 단결정 소재로 변환하였을 때 그 특성인 출력과 TVR 대역폭이 어떻게 변하는지를 모사하였다. 그 결과, 리랙서 단결정을 활용함으로써 같은 구조에서 출력을 10배 정도 향상시킬 수 있음을 확인하였다.

단결정 압전작동기를 사용한 능동 뒷전플랩 블레이드의 진동하중 감소해석 (Vibratory Loads Reduction Analysis of Active Trailing-edge Flap Blades Using Single Crystal Piezoelectric Actuators)

  • 박재상;김태성;신상준
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2007년도 추계학술대회논문집
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    • pp.326-331
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    • 2007
  • This paper conducts a vibratory loads reduction analysis of an Advanced Active Trailing-edge Flap (AATF) blade utilizing single crystal piezoelectric actuators. For an AATF blade, a new L-L piezostack actuator using single crystal PMN-PT materials is designed. The AATF blade is designed to have similar characteristics to the Advanced Active Twist Rotor (AATR) blade. The active trailingedge flap is assumed to be 20% of the blade span and 15% of the chord, located at 75% of the blade radius. In order to conduct the vibratory loads reduction analysis of the AATF blade in forward flight, DYMORE, a multi-body dynamics analysis code, is used. The simulation result shows that the hub vibratory loads may be reduced by approximately 89% even with a much lower input-voltage when comparing with the other active rotor systems.

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압전응용을 위한 Langasite(La$_3$Ga$_5$SiO$_{14}$) 단결정의 성장 및 특성 (Growth and Characteristics of Langasite(La$_3$Ga$_5$SiO$_{14}$) Single Crystal for the Piezoelectric Applicatons)

  • 정일형;오근호
    • 한국세라믹학회지
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    • 제36권6호
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    • pp.640-645
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    • 1999
  • Recently rapid progress of electronic and telecommunication technology requires the development of new piezoelectric materials and cellular communication is more and more used in various fields. Langasite(La3Ga5SiO14) is suitable for new piezoelectric properties. Langastie can be applied as communication devices due to intermediate piezoelectric properties which are similar to those of quartz and LiTaO3 in its acoustic characteristics. So in this study Langastie(La3Ga5SiO14) single crystal with 47 mm in diameter and 25mm in length were sucessfully grown by using self-designed Czochralski system. In addition optimum growth conditions for the piezoelectric applications throughout estimation of crystal quality and frequency characteristics were investigated.

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