• Title, Summary, Keyword: actuator(액추에이터)

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Smart Actuator-Control System Design Using Shape Memory Alloys (형상기억합금 응용 스마트 액추에이터-제어기 설계)

  • Kim, Youngshik;Jang, Tae-soo
    • Journal of Digital Contents Society
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    • v.18 no.7
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    • pp.1451-1456
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    • 2017
  • In this research we discuss an integrated actuator-control system for advanced control of a smart Shape Memory Alloy (SMA) actuator. Toward this goal, we designed and fabricated an actuator-control module combining two SMA actuating units with a single-chip microprocessor, two different sensing elements, and an actuator driver. In our proposed system, sensing elements include a 6-axis single-chip motion sensor for orientation measurement and a circuit for resistance measurement of SMA wires. We experimentally verified our proposed actuator-control system using actuator driving, sensor data readings, and communication tests.

Flow Control by Piezoceramic Actuator in a flat plate (평판에서 압전 세라믹 액추에이터에 의한 유동제어)

  • Kim, Dong-Ha;Han, Jong-Seob;Chang, Jo-Won;Kim, Hak-Bong
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.37 no.11
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    • pp.1080-1088
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    • 2009
  • An actuator using piezoceramic material was designed in order to perform a flow control for flat plate flow. Boundary layer measurements were carried out to explore the flow disturbances by the designed actuator that was activated at low excitation frequency(15Hz). The mean velocity and fluctuation in the boundary layers were measured at $x/{\delta}^*=31.9$ downstream from the actuator tip by a one-dimensional hot-wire probe(55P14). Results reveal that low- and high-velocity regions were observed in the vicinity of the actuator center and in the outer area of the actuator respectively, and the formation of counter-rotating streamwise vortices was predicted. The fluctuations were persistently found in the outer part of the actuator and an inflection point in the spanwise gradient of the streamwise velocity was observed. Boundary layer instability was amplified at both the actuator excitation frequency and the T-S wave frequency when the actuator was excited at low frequency.

An Experimental Approach to the Linear Actuator with a Finite Difference Equation on the Temperature Domain (온도 영역에 대한 선형 액추에이터의 실험적 고찰과 유한차분 방정식)

  • 김양호;손웅태;황석영
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.18 no.4
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    • pp.68-72
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    • 2004
  • In this paper, the energy conversion theory of the linear actuator deals with the temperature characteristic analysis with verifying temperature of linear Actuator system This model of linear actuator has winding part and mechanical spring, and a plunger. This paper proposed and experimented the linear Actuator(LA) by using finite difference equation(FDE). The experimental result represented the temperature T1 and T2 which remarks Tl is a center of magnetic road inside of actuator winding part, and T2 is a surface of actuator winding part. And the temperature characteristic of the actuator winding part are experimented by the digital temperature meter TECPEL 322.

Inducement of Design Parameters for Reliability Improvement of Servo Actuator for Hydraulic Valve Operation (유압밸브 구동용 서보 액추에이터의 신뢰성 향상을 위한 설계 파라미터 도출)

  • Sung, Baek Ju;Kim, Do Sik
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.38 no.5
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    • pp.475-482
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    • 2014
  • The precision hydraulic valve is widely used in various industrial field like aircraft, automobile, and general machinery. Servo actuator is the most important device for driving the precise hydraulic valve. The reliable operation of servo actuator effects on the overall hydraulic system. The performance of servo actuator relies on frequency response and step response according to arbitrary input signal. In this paper, we performed the analysis for the components of servo actuator to satisfy the reliable operation and response characteristics through the reliability analysis, and also induced the design parameters to realize the reliable operation and fast response characteristics of servo actuator for hydraulic valve operation through the empirical knowledge of experts and electromagnetic theories. We suggested the design equations to determine the values of design parameters of servo actuator as like bobbin size, length of yoke and plunger and turn number of coil, and verified the achieved design values through FEM analysis and performance tests using some prototypes of servo actuators adapted in hydraulic valve.

Analysis of the Voltage Characteristics Applied to a Actuator Winding by Electromechanical Energy Conversion Theory (에너지 변환 이론에 의한 직선형 피스톤 액추에이터의 권선부 인가 전압의 특성 해석)

  • Kim, Yang-Ho;Son, Woong-Tae;Hwang, Seuk-Young
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • pp.469-472
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    • 2004
  • This paper proposed and analyzed the Serial Piston Actuator(SPA) by using mechanical spring system coupled with linear actuator though the simplified structure which was verified practical experiments. The input voltage characteristics of a linear actuator are analyzed on the structure of the Linear Actuator Model System. Simulation and experimental result have been performed for the verification of the proposed system and the voltage characteristics applied to a actuator winding by electromechanical energy conversion theory. This paper proposed and analyzed the Linear Actuator Model(LAM) by using Matlab program with linear actuator was verified computer simulation based on the energy conversion theory.

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Fabrication of Ionic Polymer-Metal Composite Actuator and Application to Moving Mechanism (이온성 고분자-금속 복합물 액추에이터의 제작 및 이동형 액추에이터에의 응용)

  • Lee, Seung-Ki;Lee, Sang-Jo
    • Journal of Sensor Science and Technology
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    • v.12 no.3
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    • pp.112-120
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    • 2003
  • The composite of ionic polymer and metal has been fabricated and used for actuators. Platinum is deposited by electroless plating method onto the both sides of ionic polymer where ac voltage is applied. This results in the bending motion of a beam type actuator. In this paper, the fabrication method of ionic polymer-metal composite has been explained and the moving mechanism has been fabricated and measured using the ionic polymer-metal composite actuator. The moving mechanism is wireless type and the power is supplied through the rail electrodes in base plate. The maximum speed of the moving mechanism was about 24cm/min.

Analysis of the Actuator Winding to a Frequency Characteristic based on Energy Conversion Theory (에너지 변환 이론에 의한 액추에이터 권선부의 주파수 특성 해석에 관한 연구)

  • 김양호;이해경;황석영
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.18 no.4
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    • pp.83-87
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    • 2004
  • In this paper, an electrical equivalent circuit is derived by solving system equations. A frequency characteristics graph is calculated and the characteristics curve of the linear Actuator Model System are simulated by the Matlab program The frequency characteristics of a linear actuator are analyzed on the structure of the linear Actuator Model System This paper proposed and analyzed the linear Actuator Model(LAM) by using Matlab program with linear actuator was verified computer simulation based on the energy conversion theory.

Finite element analysis of 2 coil type Magnetic Actuator with permanent magnet (영구자석을 갖는 2 코일형 마그네틱 액추에이터의 유한요소 해석)

  • Park, Jeong-Hong;Seo, Jeong-Ho;Hahn, Sung-Chin;Joo, Su-Won
    • Proceedings of the KIEE Conference
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    • pp.25-27
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    • 2002
  • 중저압 차단기(Medium Voltage Circuit Breakers)의 최근 개발 동향은 전동 스프링 조작방식에서 마그네틱 액추에이터(Magnetic Actuator) 방식으로 전환되는 추세이다. 마그네틱 액추에이터는 동작 시판과 제어가 용이하고 부품수가 감소하여 신뢰성과 반복성이 뛰어나다.[1] 본 논문에서는 2코일형 마그네틱 액추에이터에 대해서 유한요소 모델링 하였고, 플랜져(plunger)의 이동 거리에 따른 액추에이터의 전자력 변화를 해석하였다. 또한 Time stepping 방식으로 외부 회로와 결합하여 유한요소 과도 해석을 하였다.

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Development of Smart Switchgear for Versatile Ventilation Garments: Optimum Diameter and Voltage Application Unit Time of One-way Shape Memory Alloy Wire for a Bi-directional Actuator (가변 통기성 의복을 위한 스마트 개폐장치 개발: 양방향 작동 액추에이터 제작을 위한 일방향 형상기억합금 와이어의 최적 직경 및 전압인가 단위시간의 도출)

  • Kim, Sanggu;Kim, Minsung;Yoo, Shinjung
    • Science of Emotion and Sensibility
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    • v.21 no.2
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    • pp.137-144
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    • 2018
  • The study figured out the operational conditions of a two-way movement actuator made of one-way shape memory alloy (OWSMA) for versatile ventilation intelligent garments. To develop a low-power actuator that consumes energy only when a garment changes its form such as opening and closing, multiple channels of OWSMA were used, and optimum diameter of the wires was examined. For the switch device, optimum voltage application unit time was determined. Optimum diameter of OWSMA wire was determined by applying 3.7V to the pre-determined candidate diameters, which demonstrated two-way operation in previous studies. In order to evaluate the optimum voltage application time, the internal diameter of the actuator was measured while increasing and decreasing by 50 ms from the unit time of voltage application. Delay time under two-way operation of the actuator was measured to minimize interference caused by heat between channels. Power of 3.7V was applied to OWSMA for assessment of optimal time, and the whole process from heating to cooling was video-recorded with a thermal image camera to determine the point of time at which the temperature of OWSMA wire dropped below the phase transformation temperature. The results showed that $0.4{\Phi}$ was the most suitable diameter, and the optimum unit time of voltage applied to open and close the actuator was 4100ms. It was also shown that the delay time should be more than 1.8 seconds between two-way operations of the actuator.