http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 주제어 : PZT actuator(압전작동기) (검색결과 7 건)
- 무료
- 기관 내 무료
- 유료
-
우성충(Sung-Choong Woo),박기훈(Ki Hoon Park),구남서(Nam Seo Goo) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
This study presents the static and dynamic actuating performances of a bending piezoelectric actuator with a thin sandwiched PZT plate under a static load. The stored elastic energy within the actuators which occurs during a curing process is obtained through a flexural bending test. An actuating performance is evaluated in terms of an actuating displacement at the simply supported condition. The results reveal that an actuator that consists of a top layer having a high elastic modulus and a low coefficient of thermal expansion exhibits a better performance than the rest of actuators due to the formation of the large stored elastic energy within the actuator system. When actuators are excited at the alternating current voltage, the effect of PZT ceramic softening results in a slight reduction in the resonance frequency of each actuator as the applied electric field increases. It is thus suggested that the static and dynamic actuating characteristics of bending piezoelectric actuators with a thin sandwiched PZT plate should be simultaneously considered in controlling their performances.
-
소형위성 광학탑재체의 영상안정화를 위한 초점면부 보정장치의 실험적 모델링에 관한 연구
강명수(Myoung-Soo Kang),황재혁(Jai-Hyuk Hwang),배재성(Jae-Sung Bae),박진호(Jean-Ho Park) 한국항공우주학회 2015 韓國航空宇宙學會誌 Vol.43 No.8
본 논문에서는 소형 지구관측 위성의 광학카메라에 들어가는 미소진동을 보상하기 위한 초점면부 보정장치 시스템의 실험적 모델링을 수행하였다. 미소진동 외란을 보상하는 초점면부 보정장치의 구동기로 PZT 압전작동기를 적용하였다. 압전작동기는 히스테리시스 고유 특성을 갖게 되므로 보정장치 시스템의 정확한 수학적 모델링을 얻는데 어려움이 있다. 따라서 본 연구에서는 보정장치 시스템을 2차 선형시스템으로 가정하고 MATLAB의 시스템 식별 툴박스(System Identification Toolbox)를 이용하여 실험적으로 모델링을 수행하였다. 외란의 주파수 범위인 0~50㎐에서 응답 오차 10%를 만족하기 위해 단일 선형 모델로는 불가능하며 총 4개의 선형 모델이 필요하다. 각각의 모델은 0~50㎐ 입력범위를 4개의 구간으로 나눈 영역에서 실제 동역학을 잘 표현 하고 있다. 미소진동 외란의 보상은 입력주파수에 따라 모델 스위칭 기법을 적용한 초점면부 보정장치 제어를 통해 이루어진다. Mathematical modeling of focal plane compensation device in the small earth-observation satellite camera has been conducted experimently for compensation of micro-vibration disturbance. The PZT actuators are used as control actuators for compensation device. It is quite difficult to build up mathematical model because of hysteresis characteristic of PZT actuators. Therefore, the compensation device system is assumed as a 2nd order linear system and modeled by using MATLAB System Identification Toolbox. It has been found that four linear models of compensation device are needed to meet 10% error in the input frequency range of 0~50㎐. These models describe accurately the dynamics of compensation device in the 4 divided domains of the input frequency range of 0~50㎐, respectively. Micro-vibration disturbance can be compensated by feedback control strategy of switching four models appropriately according to the input frequency.
-
신창주(Shin, Chang-Joo),홍진숙(Hong, Chin-Suk),정의봉(Jeong, Weui-Bong) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.12
This paper presents an active vibration control of cantilever beams under disturbances by a primary force. A direct velocity feedback control using a pair of PZT actuator and a velocity sensor is considered. Variation of the stability and performance with the locations of the sensor/actuator pair is investigated. It is found that the maximum gain varies with the locations of the sensor/actuator pair significantly. The maximum gain shows a symmetric distribution along the beam length with respect to the center point, although the boundary condition of the beam is unsymmetric. The control performance is affected by the location of the primary force as well as the location of the sensor/actuator pair. The active control system can more effectively reduce the vibration when the primary force is located close to the fixed boundary.
-
LIPCA에 공급되는 전기장의 변화가 PZT 특성과 적층배향에 미치는 영향
김철웅(Cheol-Woong Kim),남인창(In-Chang Nam),윤광준(Kwang-Joon Yoon) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
The advanced piezoelectric ceramic composite actuator, which is called LIPCA with the FRP and the optimization of the laminate configuration, was performed to maximize the stress transfer and the fiber bridging effect. This study evaluated the effect of variable electric fields on the PZT characteristic, laminate configuration and fatigue characteristics under the resonance frequency, which meant the largest performance range and the changes of its interlaminar phase were also evaluated by stages. In conclusions, Comparing with the fatigue life of intact LIPCA, the fatigue life of LIPCA embedded by the artificial delamination was decreased up to 50%. The micro void growth and the coalescence of epoxy were actively made at the interlaminar phase subject to the large tensile stress.
-
김세윤(S.Y.Kim),김영태(Y.T.Kim),서현배(H.B.Seo) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.춘계 No.-
This study describes the design and the measurement results of a piezoelectric micropump for a drug delivery system. The device is based on check valve of film type and piezoelectric actuator. This micropump and driving circuit has been designed for a low rate range(0~60ml/h) and we can prove it through making experiment.
-
인가전압 및 구동주파수에 따른 압전 복합재료 작동기의 횡방향 변위 특성
우성충(Sung-Choong Woo),구남서(Nam Seo Goo) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
The objective of this work is to study the effects of applied electric fields and drive frequencies on the flexural displacement of plate-type piezoelectric composite actuators (PCA) with three different lay-up configurations. Flexural bending tests on the fabricated PCA are performed at the simply supported and the fixed-free boundary conditions. It has been shown that the behavior of flexural displacement in a quasi-static state (drive frequency of 1㎐) exhibits a non-linearity with increasing applied electric fields, which is pronounced when the applied electric field is higher above 100V<SUB>pp</SUB>. On the other hand, the flexural displacement of PCA obviously depends on the applied electric fields in a drive frequency range from 1㎐ to 10㎐, while the behavior in flexural displacement is somewhat different in higher drive frequencies above 15 ㎐ due to the occurrence of resonance. As a result, the flexural displacement of PCA can be controlled so that applications for pumping devices are possible by understanding drive frequency together with the applied electric fields.
-
소형위성 카메라의 영상안정화를 위한 초점면부 보정장치 제어
황재혁(Jai-Hyuk Hwang),강명수(Myoung-Soo Kang),배재성(Jae-Sung Bae),박진호(Jean-Ho Park) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.10
In this paper, micro-position control of focal plane compensation device that applicable to the small satellites has conducted. The device actuated by stacked type piezoelectric actuator that can move fast and infinitesimally. However, this actuator has a hysteresis so that It is difficult to modeling mathematically. Therefore, mathematical modeling has been practiced by using MATLAB system identification toolbox and the device requires four models and PID controllers for covering 0~50Hz of input frequency range. According to bode plots of control systems and control simulations, a controller based on 50Hz model, one of four PID controllers, has excellent performance for 0~50Hz range than that of others. In addition, the simulation results is verified by experimental results. Position control has been successful and the maximum output error is ± 1.2㎛.
ScienceON연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
