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정순종(Soonjong Jeong),이대수(Daesu Lee),송재성(Jaesung Song),홍원표(Younpyo Hong),강은구(Eungu Kang),최원종(Wonjong Choi) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.5
This paper presents a method to reduce hysteresis in multilayer ceramic actuator by connecting the actuator with a capacitor in a series circuit. The change in hysteresis with respect to the capacitor was examined. 0.2Pb(Mg<SUB>1/3</SUB>Nb<SUB>2/3</SUB>)O₃-0.8Pb(Zr<SUB>0.475</SUB> Ti<SUB>0.525</SUB>)O₃ ceramic material was used as a piezoelectric material for the actuator. Displacement of the actuator was measured in a capacitive gap sensor measuring system. In case of inserting a capacitor in a total circuit, hysteresis became dramatically decreased, and then finally the hysteresis value can be reduced below 0.2%. It was found in this present study that reducing the hysteresis in the actuator is dependent upon the characteristics of the capacitor in total circuit and also operating frequency.
전하 제어법을 이용한 압전 액추에이터의 스트로크이력제어
정순종(Soonjong Jeong),김민수(MinSoo Kim),이대수(Daesu Lee),박언철(Eonchul Park),홍원표(Younpyo Hong),강은구(Eungu Kang),최원종(Wonjong Choi) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
This paper presents a novel way to reduce hysteresis in piezoelectric actuator by connecting the actuator with a capacitor in a series circuit. The change in hysteresis with respect to the capacitor was examined. 0.2Pb(Mg1/3Nb2/3)O₃-0.8Pb(Zr?.₄?? Ti?.?₂?)O₃ ceramic material was used as a piezoelectric material for the actuator. Displacement of the actuator was measured in a capacitive gap sensor measuring system. In case of inserting a capacitor in a total circuit, hysteresis became dramatically decreased, and then finally the hysteresis value can be reduced below 0.3%.
굴착잔토를 재활용한 지중 전력케이블 유동성 뒷채움재 이용시 지중연성관의 거동특성
오기대(Oh Gidae),김대홍(Kim Daehong),이대수(Lee Daesu),김경열(Kim Kyoungyul),홍성연(Hong Sungyun) 한국지반환경공학회 2009 한국지반환경공학회논문집 Vol.10 No.7
지중전력선과 같은 원형 지하매설관의 경우 관의 하단부 다짐효율이 낮아 파손등과 같은 구조적 문제점에 항상 노출되어있다. 이러한 문제점들 때문에 다양한 방법들이 강구되어 왔으며 그중 하나가 유동성이 뛰어난 저강도 콘크리트의 개발이다. 외국에서는 이미 오래전부터 연구개발을 진행하여 전력회사를 중심으로 이미 실용화 단계에 와있다. 따라서 본 연구에서는 개발된 지중전력케이블 유동성 뒷채움재의 거동특성을 확인하기 위해서 개발된 유동화 뒷채움재와 일반모래를 이용하여 DB-24차량하중에 대해서 매설관의 거동을 평가하기 위해서 실증실험을 수행하고 그 결과를 수치해석 및 이론식과 비교분석하였다. 그 결과 매설관의 변형은 뒷채움재의 종류에 영향을 받는 것으로 나타났다. 유동성 뒷채움재가 모래다짐 보다 관로에 미치는 토압 및 변형 특성이 우수한 것으로 확인되었다. 하지만, 실증실험 결과와 비교검토를 위해서 수행한 수치해석 및 이론식 값들이 실증실험값과 차이가나 향후 유동성 뒷채움재에 맞는 해석방법 개발이 필요할 것으로 판단된다. In the case of underground power utilities pipe such as circular pipe, the most difficult problem is low compaction efficiency of the bottom of pipe inducing the failure of utilities. To overcome this problem, various studies have been performed and one of these is CLSM (controlled low strength materials) accelerated flow ability. CLSM has already been stage of commercial use in the foreign countries led by power company. In this study, we estimated the behavior of flexible pipe with flowable backfill materials and sand to compare on the DB24 load. The results showed that the deformation of flexible pipe is affected by types of backfill materials. CLSM shows better behavior characteristics than compacting sand. But numerical and analytical results that peformed to compare to the field test results showed big gap with the field results.
전하 제어법을 이용한 압전 액추에이터의 스트로크이력제어
정순종(Soonjong Jeong),김민수(MinSoo Kim),이대수(Daesu Lee),박언철(Eonchul Park),홍원표(Younpyo Hong),강은구(Eungu Kang),최원종(Wonjong Choi) 한국생산제조학회 2006 한국생산제조시스템학회 학술발표대회 논문집 Vol.2006 No.5
This paper presents a novel way to reduce hysteresis in piezoelectric actuator by connecting the actuator with a capacitor in a series circuit. The change in hysteresis with respect to the capacitor was examined. 0.2Pb(Mg<SUB>1/3</SUB>Nb<SUB>2/3</SUB>)O₃-0.8Pb(Zr?.₄?? Ti?.?₂?)O₃ ceramic material was used as a piezoelectric material for the actuator. Displacement of the actuator was measured in a capacitive gap sensor measuring system. In case of inserting a capacitor in a total circuit, hysteresis became dramatically decreased, and then finally the hysteresis value can be reduced below 0.3%.