http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
LiTaO<sub>3</sub> 단결정을 사용한 압전변압기의 개발
황성필,김무준,하강열,강갑중,Hwang, Sung-Phil,Kim, Moo-Joon,Ha, Kang-Lyeol,Kang, Gab-Joong 한국센서학회 2002 센서학회지 Vol.11 No.3
본 연구에서는 온도에 따른 압전특성이 매우 안정적인 $LiTaO_3$ ($x-112^{\circ}$ y) 단결정을 이용하여 압전변압기를 제작하고 그 특성을 분석하였다. 제작시 $LiTaO_3$ 단결정의 변환효율이 낮은 단점을 보완하기 위해 Lame'-mode를 이용하여 길이와 폭의 비가 2:1인 압전변압기를 제작하고 PSpice를 이용하여 진동 모드 해석, 입력전압에 따른 출력전압특성 및 진동속도특성을 분석하였다. 제작한 압전변압기는 길이방향의 제 2차 고조파 주파수와 폭방향의 기본공진주파수가 결합된 290.83[kHz]에서 입력전압에 대한 최대출력전압이 나타났으며, 약 10배 정도의 승압비를 얻을 수 있었다. The single crystal of $LiTaO_3$ ($x-112^{\circ}$ y) has very stable thermal characteristics in a piezoelectric transformer. In this paper, a piezoelectric transformer made of the crystal is newly designed and its operating characteristics are analyzed. The length of the transformer is determined as twice as its width for Lame'-mode because the single crystal of $LiTaO_3$ has low electro-acoustic efficiency. The electric and vibrational characteristics of the transformer is simulated by the PSpice program, and its results are compared to experimental ones. As the results, the ratio of output voltage to input shows large than 10 at 290.83[kHz], which is the frequency coupled the 2nd harmonic for length and the fundamental for width of the Lame'-mode transformer.
원자력 발전소용 이종재(Cu 합금/STS316L) 마찰용접의 최적화와 AE에 의한 실시간 평가에 관한 연구
유인종(IN-JONG YOO),권상우(SANG-WOO KWON),황성필(SUNG-PHIL HWANG),공유식(YU-SIK KONG),오세규(SAE-KYOO OH) 한국해양공학회 2001 韓國海洋工學會誌 Vol.15 No.2
In this paper, joints of Cu-1Cr-0.1Zr alloy to S1S316L were performed by friction welding method. Particularly, Cu-1Cr-0.1Zr alloy is attractive candidate as nuclear power plant material and exibit the best combination of high strength and good electrical and thermal conductivity of any copper alloy examined. The stainless steel is a structural material while copper alloy acts as a heat sink material for the surface heat flux in the first Wall. So, in this paper, not only the development of optimizing of friction welding with more reliability and more applicabililty but also the development of in-process real-time weld quality (such as strength and toughness) evaluation technique by acoustic emission for friction welding of such nuclear reactor component of Cu-1Cr-0.1Zr alloy to STS316L steel were performed.
김일석(IL-SUG KIM),공유식(YU-SIK KONG),황성필(SUNG-PHIL HWANG),김헌경(HUN-KYONG KIM),이연탁(YEON-TAK LEE),오세규(SAE-KYOO OH) 한국해양공학회 2001 韓國海洋工學會誌 Vol.15 No.2
In this paper, not only the development of optimizing of friction welding with more reliability and more applicability but also the development of in-process real-time weld quality (such as strength and toughness) evaluation technique by acoustic emission for friction welding of the engine exhaustive valve (SUH3-SUH35 dissimilar steels of ø12.3㎜, ø16㎜, ø20㎜ and ø24㎜ in diameters) were performed, comparing with the other FRW matches of materials such as SUH3 to SUH31, SUH3 to STS303 and SUH3 to STS304. As an important result, the techniques for dissimilar friction welding optimization of engine heat resisting steels SUH3 and SUH35 (Ø12.3 ㎜, Ø16㎜, Ø20㎜, Ø24㎜) and its real-time weld quality evaluation by AE were developed, considering on both diameter and carbon equivalent effects.