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장순석(Soon Suck Jarng),김경석(Kyoung Suck Kim),권유정(You Jung Kwon) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
Digital hearing aids enclose 6~8 tiny components. Those electromechanical components are individually wired by soldering which is a manual labor and sometimes causes components’ damage by heating. This paper suggests a PCB design for overcome these problems. Several PCBs are designed and manufactured and circuited to produce ITE(In?the?Ear) type hearing aids which are inserted in the ear canal. The most optimal size of the PCB design for the ITE hearing aid is presented in this paper.
정상화,김현욱,장우양,김경석,차경래,나윤철 朝鮮大學校 機械技術硏究所 2001 機械技術硏究 Vol.4 No.2
최근 전 세계적으로 초소형 정밀 기계 기술에 관한 연구 및 개발이 활발하게 이루어지면서 형상기억합금(Shape Memory Alloy : SMA)을 이용한 초소형 액츄에이터(Micro Actuator)에 관한 관심이 증대되고 있다. 형상기억합금을 액츄에이터에 응용하기 위해서는 동적 특성의 분석이 필수적이지만 지금까지의 연구에서는 형상기억합금의 물질 및 재료적 특성은 많이 보고되고 있으나 동적 특성에 대한 연구는 매우 부족한 실정이다. 본 논문에서는 비저항(resistivity)이 큰 NiTi합금 와이어(wire)를 이용하여 나선형 스프링(helical spring)을 제작하여 디지털 힘 측정기(Digital force gauge)와 적외선 온도센서(Infrared themometer) 그리고 레이저 변위 센서(Laser displacement sensor)를 이용하여 이 NiTi 스프링의 힘의 크기와 반응속도, 온도와 변위를 측정하여 형상기억합금의 동적 특성을 분석하였다. 또한 형상기억합금을 이용하여 차동식 액츄에이터를 제작하여 그 동적 성능을 실험하였다. In the recent years, as the research and the development of micro and precision machinery become active, the interest of micro actuators using SMA(Shape Memory Alloy) has been increased. The dynamic characteristic analysis of SMA is necessary for actuator application and many common researches report the material characteristics of SMA sufficiently. However, the research on dynamic characteristics is very deficient. In this paper, the helical spring are fabricated with NiTi SMA wire of high resistivity. The force, response speed, temperature, and displacement are measured by digital force gauge, infrared thermometer, and laser displacement sensor so that the dynamic characteristics of this SMA is analyzed. Also, bidirectional actuator was fabricated and experimented for its performance.
광학적 비접촉 측정에 의한 구조물에 해석의 화상처리 계측 시스템 개발에 관한 연구
장순석,김경석,양승필,정현철,강기수,김종수,최지은 한국공작기계학회 1999 한국생산제조학회지 Vol.8 No.6
This study discusses a non-contact optical technique, electronic speckle pattern interferometry(ESPI), that is well suited for in-plane and out-of-plane deformation measurement. However, the existing ESPI methods that are based on dual-exposure, real-time and time-average method have difficulties for accurate measurement of structure, due to irregular intensity and shake of phase. Therefore, phase shifting method has been proposed in order to solve this problem. About the method, the pah of reference light in interferometry is shifted and added to least square fitting method to make the improvement in distinction and precision. This proposed method is applied to measure in-plane displacement, that is compared with the previous method. Also, Used as specimen, AS4/PEEK [30/-30/90]s was analyzed by ESPI based on real-time to determine the characteristics of vibration under no-load and tension. These results are quantitatively compared with those of FEM analysis in mode shapes.