• 제목/요약/키워드: Ceramic Actuator

검색결과 178건 처리시간 0.026초

닥터블레이드법에 의한 PLZT계 경사기능 압전 엑튜에이터의 제조와 압전 변위 특성 (Fabrication and Piezoelectric Strain Characteristics of PLZT Functionally Gradient Piezoelectric Actuator by Doctor Blade Process)

  • 김한수;최승철;이전국;정형진
    • 한국세라믹학회지
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    • 제29권9호
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    • pp.695-704
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    • 1992
  • In (Pb, La)(Zr, Ti)O3 ceramic system, the functionally gradient material (FGM) was developed, and its processing and properties were investigated. The FGMs were successfully prepared through doctor blade method with acrylic binder system as well as mold stacking press method. The ultrasonic treatment was very effective for particle dispersion in slurry, and it lead to form clack-free green films. The strain-voltage characteristics of the FGM system was significantly improved which fabricated between a high piezoelectric-low dielectric and a low piezoelectric-high dielectric composition layer.

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액츄에이터 응용을 위한 $Fe_2O_3$$MnO_2$ 첨가에 따른 $Pb(Ni_{1/3}Nb_{2/3})O_3-PbTiO_3-PbZrO_3$ 세라믹스에서의 유전 및 압전 특성 (Effects of $Fe_2O_3$ and $MnO_2$ Additives on Dielectric and Piezoelectric Properties of $Pb(Ni_{1/3}Nb_{2/3})O_3-PbTiO_3-PbZrO_3$ Ceramics for Actuator Applications)

  • 임은경;백종후;김창일;신범승;임종인;이영진;최병현
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2006년도 하계학술대회 논문집 Vol.7
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    • pp.329-330
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    • 2006
  • 본연구에서는 초음파 모터 등의 고출력 액츄에이터에 응용 가능한 $0.4Pb(Ni_{1/3}Nb_{2/3})O_3$-$0.6Pb(Zr_{0.405}Ti_{0.595})O_3$ + 0.25wt% $Fe_2O_3$ 조성시스템에 $MnO_2$ (0~1 wt.%)첨가하여 압전, 유전특성 및 미세구조에 관해 고찰하였다. 본조성을 $1125{\sim}1175^{\circ}C$ 온도에서 2시간 소결하여 시편을 제조하였으며 이의 결정구조 및 미세조직을 분석하였다. $MnO_2$ 첨가량 증가에 따라 압전 상수와 전기기계결함계수는 감소하였으며, 기계적 품질계수는 0.5 wt% 첨가시까지 증가하였으나 첨가량이 그 이상 증가함에 따라 감소하였다. 압전특성은 $1125^{\circ}C$에서 소결한 $MnO_2$ 0.5wt%조성에서 ${\varepsilon}r$ = 2040, kp = 0.66, $d_{33}$ = 504, Qm=438의 우수한 특성을 나타내었다.

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Filtered-x LMS 알고리즘을 이용한 유연한 외팔보의 능동진동제어 (Active vibration control of a flexible cantilever beam using Filtered-x LMS algorithm)

  • 박수홍;홍진석;김흥섭;오재응
    • 한국정밀공학회지
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    • 제14권3호
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    • pp.107-113
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    • 1997
  • This paper presents the active control of a flexible cantilever beam vibration. The cantilever beam was excitied by a steady-state harmonic and white noise point force and the control was performed by one piezo ceramic actuator bonded to the surface of the beam. An adaptive controller based on filtered-x LMS algorithm was used and the controller was defined by minimizing the square of the response of error sensor. In the experiment, gap sensor was used as an error sensor while the sinusoidal or white noise was applied as a disturbance. In the case of sinusoidal input, more than 20 dB of vibration reduction was achieved over all range of the natural frequencies and it takes 5 seconds to control the vibration at first natural frequency and 1 second at other natural frequencies. In the case of white noise input, 7 dB of vibration reduction was achieved at the first natural frequency and good control performance was achieved in the considered whole frequency range. Results indicate that the vibration of a flexible cantilever beam could be controlled effectively when the piezo ceramic actuator was used with filtered-x LMS algorithm.

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굽힘 압전 복합재료 작동기의 전기적 피로 거동 (Electric Fatigue Behavior of a Bending Piezoelectric Composite Actuator)

  • 우성충;구남서
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2008년도 추계학술대회A
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    • pp.362-367
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    • 2008
  • In the present work, we address electric fatigue behavior in bending piezoelectric actuators using an acoustic emission technique. Electric cyclic fatigue tests have been performed up to ten million cycles on the fabricated specimens. To confirm the fatigue damage onset and its pathway, the source location and distributions of the AE behavior in terms of count rate are analyzed over the fatigue range. It is concluded that electric cyclic loading leads to fatigue damages such as transgranular damages and intergranular cracking in the surface of the PZT ceramic layer, and intergranular cracking even develops into the PZT inner layer, thereby degrading the displacement performance. The electric-induced fatigue behavior seems to show not a continuous process but a step-by-step process because of the brittleness of PZT ceramic. Nevertheless, this fatigue damage and cracking do not cause the final failure of the bending piezoelectric actuator loaded up to 107 cycles. Investigations of the AE behavior and the linear AE source location reveal that the onset time of the fatigue damage varies considerably depending on the existence of a glass-epoxy protecting layer.

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전기적 피로하중을 받는 압전 작동기의 손상 메커니즘 (Damage Mechanisms of a Piezoelectric Actuator under Electric Fatigue Loading)

  • 우성충;구남서
    • 대한기계학회논문집A
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    • 제32권10호
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    • pp.856-865
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    • 2008
  • Damage mechanisms in bending piezoelectric actuators under electric fatigue loading are addressed in this work with the aid of an acoustic emission (AE) technique. Electric cyclic fatigue tests have been performed up to $10^7$ cycles on the fabricated bending piezoelectric actuators. An applied electric loading range is from -6 kV/cm to +6 kV/cm, which is below the coercive field strength of the PZT ceramic. To confirm the fatigue damage onset and its pathway, the source location and distributions of the AE behavior in terms of count rate and amplitude are analyzed over the fatigue range. It is concluded that electric cyclic loading leads to fatigue damages such as transgranular damages and intergranular cracking in the surface of the PZT ceramic layer, and intergranular cracking even develops into the PZ inner layer, thereby degrading the displacement performance. However, this fatigue damage and cracking do not cause the final failure of the bending piezoelectric actuator loaded up to $10^7$ cycles. Investigations of the AE behavior and the linear AE source location reveal that the onset time of the fatigue damage varies considerably depending on the existence of a glass-epoxy protecting layer.

PMN - PT - PZ 계 세라믹스를 이용한 압전 엑츄에이터의 제작 및 변위 특성 (The fabrication and strain properties of piezoeletric ceramic actuator using PMN - PT -PZ system)

  • 지승한;이능헌;이덕출;김호기
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 1993년도 춘계학술대회 논문집
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    • pp.15-18
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    • 1993
  • Piezoelectric Actuator and electrostrictive Actuator samples were fabricated using PMN-PT-PZ system ceramics with Barium substitution, and the strain properties of them investigated. The largest Piezoelectric coefficient and electromechanical coupling coefficient were observed at sintering temperature $1250^{\circ}C$, Barium 0.05 mol %. The strain of poled samples is observed twice highly then unpoled ones, and the former showed larger hysteresis in strain then the latter, too. Poled multilayered actuator samples showed considerable strain.

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적층 복합재료를 사용한 곡면형 작동기의 성능 예측을 위한 대규모 수치해석 연구 (Large Scale Numerical Analysis for the Performance Prediction of Multilayered Composite Curved Actuator)

  • 정순완;황인성;김승조
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2003년도 추계학술발표대회 논문집
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    • pp.167-170
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    • 2003
  • In this paper, the electromechanical displacements of curved actuators using laminated composites are calculated by finite element method to design the optimal configuration of curved actuators. To predict the pre-stress in the device due to the mismatch in coefficients of thermal expansion, the carbon-epoxy and glass- epoxy as well as PZT ceramic is also numerically modeled by using hexahedral solid elements. Because the modeling of these thin layers causes the numbers of degree of freedom to increase, large-scale structural analyses are performed in a cluster system in this study. The curved shape and pre-stress in the actuator are obtained by the cured curvature analysis. The displacement under the piezoelectric force by an applied voltage is also calculated to compare the performance of curved actuator. The thickness of composite is chosen as design factor.

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고성능 컴퓨팅을 이용한 곡면형 작동기의 최적 설계 (Optimal Design of Curved Actuator through High Performance Computing)

  • 정순완;김승조
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2003년도 춘계학술발표대회 논문집
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    • pp.87-90
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    • 2003
  • In this paper, the electromechanical displacements of curved actuators such as THUNDER are calculated by finite element method to design the optimal configuration of curved actuators. To predict the pre-stress in the device due to the mismatch in coefficients of thermal expansion, the adhesive as well as metal and PZT ceramic is also numerically modeled by using hexahedral solid elements. Because the modeling of these thin layers causes the numbers of degree of freedom to increase, large-scale structural analyses are performed in a cluster system in this study. The curved shape and pre-stress in the actuator are obtained by the cured curvature analysis. The displacement under the piezoelectric force by an applied voltage is also calculated to compare the performance of curved actuator. The thickness of metal and adhesive, the number of metal layer are chosen as design factors.

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적층 액츄에이터용 아크릴릭계 바인더/압전 세라믹계의 열분해 거동 (Pyrolysis Behavior of Acrylic Binder/Piezoelectric Ceramic System for Multilayer Actuator)

  • 박성의;이전국;정형진
    • 분석과학
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    • 제6권2호
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    • pp.231-238
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    • 1993
  • 적층 액츄에이터에서 바인더의 열적 거동이 액츄에이터의 물성을 좌우하므로 압전-전왜 재료로서 우수한 PNN-PZT/Acrylic binder의 혼합물에서 고분자 열분해 메카니즘과 결합제 번아웃 공정에 영향을 끼치는 요소들을 FTIR, DSC, TGA와 같은 분석기기를 통하여 분석하였다. 결합제는 2단계를 거쳐 번아웃이 되며, 산소 분위기일 경우 열분해가 활발해져서 최종 잔유물이 5% 내외로 최소화되므로 물성이 좋은 액츄에이터를 얻을 수 있다.

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유한요소 해석을 이용한 적층 압전 세라믹 액츄에이터의 응력 특성 (Stress Properties in Multilayer Piezoelectric Ceramic Actuators using Finite Element Analysis)

  • 홍재일
    • 한국전기전자재료학회논문지
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    • 제11권11호
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    • pp.963-968
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    • 1998
  • The stress distribution in multilayer piezoelectric ceramic actuators was investigated by Finite element analysis. The y direction stress was concentrated at electrode tip. The y direction maximum stress was decreased to 4.9$\times10^ 7 N/m^2$ with internal electrode gap(a) until 0.4 mm and was not much difference with external electrode thickness(c). The stress distribution with internal layers was almost same and the stress distribution of load condition was higher than that of no load condition The y direction maximum stress increased with the number of layer and saturated at 260 layers. In the case of defective actuator, the stress distribution was disconnected around the defect and larger than that of normal actuator.

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