• Title/Summary/Keyword: Piezoactuator

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Effect of Piezoactuator Length Variation for Vibration Control of Beams (보의 진동제어를 위한 압전 액추에이터의 길이변화 효과 연구)

  • Lee, Young-Sup
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.18 no.11
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    • pp.1185-1191
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    • 2008
  • This paper presents an approach to define an optimal piezoactuator length to actively control structural vibration. The optimal ratio of the piezoactuator length against the beam length when a pair of piezoceramic actuator and accelerometer is used to suppress unwanted vibration with direct velocity feedback(DVFB) control strategy is not clearly defined so far. It is well known that DVFB control can be very useful when a pair of sensor and actuator is collocated on structures with a high gain and excellent stability. It is considered that three different collocated Pairs of piezoelectric actuators (20, 50 and 100 mm long) and accelerometers installed on three identical clamped-clamped beams($30{\times}20{\times}1mm$). The response of each sensor-actuator pair requires strictly positive real(SPR) property to apply a high feedback gain. However the length of the piezoactuator affects the SPR property of the sensor-actuator response. Intensive simulation and experiment show the effect of the actuator length variation is strongly related with the frequency range of the SPR property. Thus an optimal length ratio was suggested to obtain relevant performance with a good stability under the DVFB strategy.

Pressure Control of a Piezoactuator-Driven Pneumatic Valve System (압전 작동기로 구동 되는 공압 밸브의 압력제어)

  • Jo, Myeong-Su;Yu, Jung-Gyu;Choe, Seung-Bok
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.2
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    • pp.399-405
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    • 2002
  • This paper proposes a new type of piezoactuator-driven valve system. The piezoceramic actuator bonded to both sides of a flexible beam surface makes a movement required to control the pressure at the flapper-nozzle of a pneumatic valve system. After establishing a dynamic model, an appropriate size of the valve system is designed and manufactured. Subsequently, a robust H$_{\infty}$ control algorithm is formulated in order to achieve accurate tracking control of the desired pressure. The controller is experimentally realized and control performance for the sinusoidal pressure trajectory is presented in time domain. The control bandwidth of the valve system, which directly represents the fastness, is also evaluated in the frequency domain.

Vibration and precision position control of dual actuators with parallel type piezoactuator (이단 압전 구동기를 가진 이중 구동기의 진동 및 정밀위치제어)

  • Lee, Yong-Gwon;Cho, Won-Ik;Yang, Hyun-Suk;Park, Young-Pil
    • Proceedings of the KSME Conference
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    • 2000.04a
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    • pp.475-480
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    • 2000
  • A new positioning mechanism with Parallel type actuator using piezoelectric material and with dual type actuators using voice coil motor (VCM) and piezoactuator is proposed for optical disk drive or near-field recording type drive, and high speed position and vibration control are investigated. Parallel type bimorph piezoactuator is used as a fine motion actuator with self-sensing technique, which allows a piezoelectric material to concurrently sense and actuate in a closed loop frame work, and positive position feedback control algorithm is adopted to further control residual vibration. For positioning control of VCM, PID control algorithm is adopted.

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Pressure Control of a Piezoactuator-Driven Pneumatic Valve System (압전 작동기로 구동되는 공압 밸브의 압력제어)

  • Cho, M.S.;Yoo, J.K.;Choi, S.B.
    • Proceedings of the KSME Conference
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    • 2000.11a
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    • pp.554-558
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    • 2000
  • This paper proposes a new type of piezoactuator-driven valve system. The piezoceramic actuator bonded to both sides of a flexible beam surface makes a movement required to control the pressure at the flapper-nozzle of a pneumatic system. After establishing a dynamic model, an appropriate size of the valve system is designed and manufactured. Subsequently, a sliding mode controller which is known to be robust to uncertainties such as disturbance is formulated in order to achieve accurate regulating and tracking control of the desired pressure. The controller is experimentally realized and control performances for various pressure trajectories are presented in time domain. The control bandwidth of the valve system which directly represents the fastness is also evaluated in the frequency domain.

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Effect of Piezoactuator Length Variation for Vibration Control of Beams (보의 진동제어를 위한 압전 액추에이터의 길이변화 효과 연구)

  • Lee, Young-Sup
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2008.04a
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    • pp.442-448
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    • 2008
  • This paper presents an approach to define an optimal piezoactuator length to actively control structural vibration. The optimal ratio of the piezoactuator length against beam length when a pair of piezoceramic actuator and accelerometer is used to suppress unwanted vibration with direct velocity feedback (DVFB) control strategy is not clearly defined so far. It is well known that direct velocity feedback (DVFB) control can be very useful when a pair of sensor and actuator is collocated on structures with a high gain and excellent stability. It is considered that three different collocated pairs of piezoelectric actuators (20, 50 and 100 mm) and accelerometers installed on three identical clamped-clamped beams (300 * 20 * 1 mm). The response of each sensor-actuator pair requires strictly positive real (SPR) property to apply a high feedback gain. However the length of the piezoactuator affects SPR property of the sensor-actuator response. Intensive simulation and experiment shows the effect of the actuator length variation is strongly related with the frequency range of SPR property. A shorter actuator gave a wider SPR frequency range as a longer one had a narrower range. The shorter actuator showed limited control performance in spite of a higher gain was applied because the actuation force was relatively small. Thus an optimal length ratio (actuator length/beam length) was suggested to obtain relevant performance with good stability with DVFB strategy. The result of this investigation could give important information in the design of active control system to suppress unwanted vibration of smart structures with piezoelectric actuators and accelerometers.

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Modeling and Control of an Engine Mount Using ER Fluids and Piezoactuators (ER 유체와 압전작동기를 이용한 엔진마운트의 모델링 및 제어)

  • Choi, Seung-Hoon;Choi, Young-Tai;Choi, Seung-Bok
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.20 no.2
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    • pp.500-510
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    • 1996
  • This paper presents a new prototype of an engine mount for a passenger vehicle featuring ER(elector-rheological) fluids and piezoactuators. Conventional rubber mounts and various types of passive or semi-active hydraulic engine mounts have their own functional aims on the limited frequency band in the board engine operating frequency range. However, the proposed engine mount covers all frequency range of the engine operation. A mathematical model of the proposed engine mount is derived using the bond graph method which is inherently domain, the ER fluid is activated upon imposing electric field for vibration isolation while the piezoactuator. Computer control electric fluid for the ER fluid H.inf. cotrol technique is adopted for the piezoactuator. Computer simulation is undertaken in order to demonstrate isolation efficiency of the engine mount over wide operating frequency range.

Dynamic Modeling and Pressure Control of Piezoactuator Based Valve Modulator Integrated with Flexible Flapper (유연 플래퍼와 연계한 압전 밸브 모듈레이터의 동적 모델링 및 압력 제어)

  • Jeon, Jun-Cheol;Maeng, Young-Jun;Sohn, Jung Woo;Choi, Seung-Bok;Lee, Soo-Jin
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.20 no.10
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    • pp.976-982
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    • 2010
  • This paper proposes a novel type of pressure control mechanism which can apply to vehicle ABS (anti-lock braking system) utilizing the piezoactuator based valve system associated with the pressure modulator. As a first step, a flapper-nozzle of a pneumatic valve system is devised by integrating the piezoacuator to the flexible beam structure. The dynamic modeling of the valve system is then undertaken and subsequently the governing equation of pressure control is derived considering the pressure modulator. A sliding mode controller is designed in order to achieve accurate pressure tracking control in the presence of actuator uncertainty as well as input pressure variation. It is shown through computer simulation that an accurate pressure tracking for sinusoidal motion whose magnitude is 40 bar is achieved by utilizing the proposed pressure control mechanism.

[ $H_{\infty}$ ] Pressure Control of Pneumatic Valve Driven by Piezoactuators (압전 작동기로 구동 되는 공압 밸브의 $H_{\infty}$ 압력제어)

  • Yoo, J.K.;Cho, M.S.;Choi, S.B.
    • Proceedings of the KSME Conference
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    • 2001.11a
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    • pp.673-678
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    • 2001
  • This paper proposes a new type of piezoactuator-driven valve system. The piezoceramic actuator bonded to both sides of a flexible beam surface makes a movement required to control the pressure at the flapper-nozzle of a pneumatic valve system. After establishing a dynamic model, an appropriate size of the valve system is designed and manufactured. Subsequently, a robust $H_{\infty}$ control algorithm is formulated in order to achieve accurate tracking control of the desired pressure. The controller is experimentally realized and control performance for the sinusoidal pressure trajectory is presented in time domain. The control bandwidth of the valve system, which directly represents the fastness, is also evaluated in the frequency domain.

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Study on the geometrical nonlinearity of the hinge mechanism used in a piezoactuator (압전구동기에 사용되는 힌지 메커니즘의 기구학적 비선형성에 관한 연구)

  • 김준형;김수현;곽윤근
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1638-1642
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    • 2003
  • Piezoactuator using a flexure hinge mechanism is often used in the precision stages. When the total size of the hinge mechanism become small compared with the deformation of the hinge mechanism, the geometrical nonlinearity makes a considerable error in the output displacement. In this research, the incremental method based on the matrix method is developed to model the effect of the geometrical nonlinearity. Developed modeling method is applied to derive the error of output displacement of the bridge-type hinge mechanism and its results are derived with respect to the design parameters. This method can be easily used to the design optimization of the hinge mechanism and analysis results show that the geometrical nonlinearity error should be considered to achieve a high accuracy to the piezoactuators.

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