• Title/Summary/Keyword: 압전감지기/작동기

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Active Control of Forced Vibrations in Smart Laminated Composite Plates Using Piezoceramics (압전세라믹을 이용한 지능 복합적층판의 강제진동의 능동제어)

  • 강영규;구근회;박현철
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.11 no.6
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    • pp.193-199
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    • 2001
  • Active control of forced vibration of the cantilevered laminated composite plates using collocated piezoceramic sensor/actuator is analyzed numerically and verified experimentally for various fiber orientations. Impact on the stiffness and the damping properties is studied by varying stacking sequence of [$\theta$$_{4}$O$_{2}$90$_{2}$]s for the laminated composite plate. For the forced vibration control, the plate is excited by one pair of collocated PZT exciters in resonance and its vibrational response is suppressed by the other collocated PZT sensor/actuator using direct negative velocity feedback. It is shown that the active control of forced vibration is more effective for the smart laminated plate with higher modal damped stiffness(2ζ$\omega$/aup 2/) .

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Distributed Piezoelectric Sensor /Actuator Optimal Design for Active Vibration Control of Shell Structure (쉘 구조물의 진동제어를 위한 분포형 압전 감지기/작동기의 설계 최적화)

  • 황준석;목지원;김승조
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2000.04a
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    • pp.154-157
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    • 2000
  • Distributed piezoelectric sensor and actuator system has been designed for the active vibration control of shell structure. PVDF is used for the materials of sensor/actuator. To prevent the adverse effect of spillover, distributed modal sensor/actuator system is established. Although shell structure is three-dimensional structure, the PVDF sensor/actuator system can be treated as two-dimensional Finite element programs are developed to consider curved structures having PVDF modal sensor/actuator. The nine-node Mindlin shell element with five nodal degree of freedoms is used for finite element discretization. The electrode patterns and lamination angle of PVDF sensor/actuator are optimized to design the modal sensor/actuator system Genetic algorithm is used for optimization. Sensor is designed to minimize the observation spillover, and actuator is designed to minimize the system energy of the control modes under a given initial condition. Modal sensor/actuator for the first and second modes of singly curved cantilevered shell structure are designed using mentioned methods. Discrete LQG method is used as a control law. Experimental demonstrations of the active vibration control with designed sensor/actuator system have been performed successfully.

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An Experimental Study for Noise Reduction of Piezoelectric Smart Panel (압전 지능패널의 소음저감 성능에 관한 실험적 연구)

  • Im Byoung soo;Kim Jae Hwan;Lee Joong Kuen
    • Proceedings of the Acoustical Society of Korea Conference
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    • autumn
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    • pp.393-396
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    • 1999
  • 본 논문에서는 흡음 재료와 압전 재료를 부착시켜 넓은 대역에서 소음 저감을 향상 시키는 압전 지능패널(piezoelectric smart panel)을 구성한 후 이를 통하여 구조물로부터 복사되는 소음의 저감 성능을 실험적으로 고찰 하였다. 우선, 단빌 평판과 흡음 재료가 부학된 편판을 구성하여 소음 저감 성능을 즉정 하였다. 그리고 두 방법을 합성하여 광 대역에서의 소음을 저감 시키기 위해 흡음 재료와 압전 재료를 부착한 압전 지능패널을 이용하여 감지기로부터 측정된 신호를 적절한 부 이득(negative gain)을 거쳐 작동기에 되먹임 하였을 때의 소음 저감 성능을 측정 하고 앞의 두 결과와 비교하였다. 실험 결과로부터 수동적 방법과 능동적 방법을 복합적으로 구성한 압전 지능패널이 넓은 주파수 대역에서 소음을 저감 시킬 수 있음을 확인할 수 있었다.

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Development of Power Amplifier for Piezoelectric Actuator and Control Algorithm Realization System for Active Vibration Control of Structures (구조물 능동진동제어를 위한 압전 작동기 구동 파워앰프와 제어 알고리즘 구현 시스템의 개발)

  • Lee, Wan-Joo;Kwak, Moon-K.
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.22 no.2
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    • pp.170-178
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    • 2012
  • This paper is concerned with the development of power amplifier and controller for piezoelectric actuator and sensor used in smart structures. Even though a high-voltage power amplifier is provided in the form of an operational amplifier, a very high DC voltage is still necessary as a power supply. In this study, we propose a low-cost design for the power amplifier including the DC power supply. We also need a controller on which a control algorithm will be mounted. In general, a digital signal processing chip is popularly used because of high speed. However, only commercial product is available for smart structure applications. In this paper, a controller consisting of a DSP and electronic circuits suitable for piezoelectric sensor and actuator pair is proposed. To validate the proposed controller with power amplifier, experiment on smart structure was carried out. The experimental results show that the proposed control system can be effectively used for smart structure applications with low cost.

Optimal Vibration Control Experiments of Composite Plates Using Piezoelectric Sensor/Actuator (압전 감지기/작동기를 이용한 복합재 평판의 최적 진동제어 실험)

  • Rew, Keun-Ho;Han, Jae-Hung;Lee, In
    • Journal of KSNVE
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    • v.7 no.1
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    • pp.161-168
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    • 1997
  • The present paper describes the vibration control experiment of composite plates with bonded piezoelectric sensor and actuator. The system is modeled as two degree-of-freedom system using modal coordinates and the system parameters are obtained from vibration tests. Kalman filter is adopted for extracting modal coordinates from sensor signal, and control algorithms applied to the system are Linear Quadratic Gaussian(LQG) control, Bang-Bang Control (BBC), Negative Velocity Feedback(NVF), Proportional Derivative Control(PDC). From observation of the spillover and control perfomance, it is concluded that a higher order control algorithm such as LQG rather than BBG, NVF, PDC is suitable for efficient simultaneous control of both bending and twisting modes of composite plates.

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Vibration Control of Composite Thin-Walled Beams with a Tip Mass Via Fuzzy logic and Piezoelectric Sensors and Actuator (끝단 질량을 가진 복합재료 얇은 벽보의 퍼지이론과 압전 감지기/작동기를 이용한 진동제어)

  • 이윤규;송오섭;민준식;강호식;정남희
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2003.11a
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    • pp.950-957
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    • 2003
  • This paper deals with adaptive fuzzy logic controller design to achieve proper dynamic response of a composite thin-walled beam with a tip mass. In order to check the effectiveness of this controller, three different types of control logic are selected and applied. The adaptive control capabilities provided by a system of piezoactuators bonded or embedded into the structure are also implemented in the system. Results show that the fuzzy logic controller is more effective than the proportional or velocity feedback controller for the vibration control of composit thin-walled beam with a tip mass.

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Elastodynamic Control of Industrial Robotic Manipulators Using Piezoelectric Materials (압전재료를 이용한 산업용 로보트 매니퓰레이터의 동탄성 제어)

  • Choi, S.B.;Cheong, C.C.;Choi, I.S.;Lee, T.H.
    • Journal of the Korean Society for Precision Engineering
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    • v.10 no.4
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    • pp.54-63
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    • 1993
  • This paper presents the dynamic modeling and control methodology to arrest structural deflections of industrial robotic manipulators featuring elastic members retrofitted with surface bonded pizoelectric actuators and sensors. The cynamic modeling is accomplished by employing a variational theorem, prior to developing a finite element formulation. This finite element formulation accounts for both original robot member elements and also bonded piezoelectric material elements. The governing equation of motion is then modified by condensing the electric potential vectors and subsequently two different negative velocity feedback controllers are established; a constant-gain feedback controller and a constant- amplitude feedback controller. By adopting a Model P50 articulating industrial robot manufactured by Gerneral Electric Company, conputer simulations are underlaken in order to demonstrate superior performance characteristics to be accrued from this proposed methodology such as smaller deflections at the end-effector.

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Papers : Three - dimensional assumed strain solid element for piezoelectric actuator/sensor analysis (3 차원 가정변형률 솔리드 요소를 이용한 압전 작동기/감지기 해석)

  • Jo, Byeong-Chan;Lee, Sang-Gi;Park, Hun-Cheol;Yun, Gwang-Jun;Gu, Nam-Seo
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.30 no.2
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    • pp.67-74
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    • 2002
  • The paper deals with a fully assumed strain soild element that can be used for modeling of thin sensors and actuators. To solve fully coupled field problems, the eledtric potential is regarded as a nodal degree of freedom in addition to three translations in an eighteen node assumed strain soild element. Therefore, the induced electric potential can be calculated for a prescribed load and the actuation displacement can be computed for an input voltage. Since the assumed strain solid element can alleviate locking. A finite element code is developed based on the formulation and typical numerical examples are solved for code validation. Using the code, we have conducted parametric study for THUNDER actuator. It is found that a particular combination of materials for layer curvature of THUNDER improves the actuation displacement.

Wirelessly Driven Cellulose Electro-Active Paper Actuator: Application Research (원격구동 셀룰로오스 종이 작동기의 응용연구)

  • Kim, Jae-Hwan;Yang, Sang-Yeol;Jang, Sang-Dong;Ko, Hyun-U;Mun, Sung-Cheol;Kim, Dong-Gu;Kang, Jin-Ho
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.36 no.5
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    • pp.539-543
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    • 2012
  • Cellulose Electro-Active Paper (EAPap) is attractive as a biomimetic actuator because of its merits: it is lightweight, operates in dry conditions, has a large displacement output, has a low actuation voltage, and has low power consumption. Cellulose is regenerated so as to align its microfibrils, which results in a piezoelectric paper. When chemically bonded and mixed with carbon nanotubes, titanium oxide, zinc oxide, tin oxides, the cellulose EAPap can be used as a hybrid nanocomposite that has versatile properties and that can meet the requirements of many application devices. This paper presents trends in recent research on the cellulose EAPap, mainly on material preparation and its use in devices, including biosensors, chemical sensors, flexible transistors, and actuators. This paper also explains wirelessly driving technology for the cellulose EAPap, which is attractive for use in biomimetic robotics and micro-aerial vehicles.

Vibration Control of Laminated Composite Beams Using Active Constrained Layer Damping Treatment (능동구속감쇠 기법을 이용한 복합적층보의 진동 제어)

  • 강영규;최승복
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.11 no.7
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    • pp.261-266
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    • 2001
  • The flexural vibration of laminated composite beams with active and passive constrained layer damping has been investigated to design a structure with maximum possible damping capacity. The equations of motion are derived fro flexural vibrations of symmetrical,. multi-layer laminated beams. The damping ratio and model damping of the first bending mode are calculated by means of iterative complex eigensolution method. The direct negative velocity feedback control is used for the active constrained layer damping. It is shown that the flexible laminated beam is more effective in the vibration control for both active and passive constrained layer damping. and this paper addresses a design strategy of laminated composite under flexural vibrations with constrained layer damping.

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