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RISS 인기검색어
- 검색키워드
- 저자 : 김성훈(Seunghoon Kim) (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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김성훈(Seunghoon Kim),백경윤(Kyungyun Baek),박노식(Nosik Park),민한기(Hangi Min),정상화(Sanghwa Jung),양인영(Inyoung Yang) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, For nondestructive evaluation of Ferrule and Ball lens, we made of the measuring system by RUS. We evaluated existence of flaws through comparison with resonant frequency of Ferrule and Ball lens. The objective of the paper is to evaluate defect and shape error by using nondestructive evaluation method with Resonant Ultrasound Spectroscopy(RUS). RUS system is configured of spectrum analyzer, power amplifier, PZT sensor and support frame. For defect evaluation by the RUS, we performed to measure natural frequency of Ferrule, both acceptable and cracked. In the Ball lens, we performed to investigate relationship between frequency measuring parameter(β) and mass of each specimens. And then, in the case of Ferrule, the resonant frequency of cracked-Ferrule existed to the high level frequency band than acceptable-Ferrule. p increase as the mass increase.
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김영남(Youngnam Kim),조영재(Youngjea Cho),김성훈(Seunghoon Kim),이길성(Kilsung Lee),양인영(Inyoung Yang) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper is to study the effects of curvature and staking sequence on the penetration characteristics of composite laminated shell. And we were performed to investigate the penetration characteristics of composite laminated shells by the oblique impact. Composite laminates used in this test are CFRP orthtropic laminated plates, which are stacked with two-interfaces [0₃/90₃] sand [0₂/90₃/0] s. They are manufactured to varied curvature radius (R=100, 150, 200㎜ and ∞). They are cured by heating to the appropriate hardening temperature(130˚) by mean of a heater at the vacuum bag of the autoclave. Test specimens were prepared with dimensions 100㎜ x 140㎜. When the specimen is subjected to transverse impact by a steel ball, the velocity of the steel ball was measured both before and after impact by determining the time for it to pass two ballistic -screen sensor located a known distance apart. In general, the critical penetration energy increased as the curvature increased, interface decrease and slope angle on the impact surface increased.
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형광온도계를 사용한 초음속 연소기 표면온도 가시화 기술 개발
이석환(Seok Hwan Lee),김용규(Yong-Gyoo Kim),강웅(Woong Kang),김성훈(Sunghun Kim),이승훈(Seunghoon Lee),양인영(Inyoung Yang) 한국추진공학회 2019 한국추진공학회 학술대회논문집 Vol.2019 No.5
본 연구에서는 스크램제트 엔진에서 재생냉각 성능을 평가하기 위하여 형광체 온도계를 사용하여 연소기의 벽면 온도를 가시화하는 연구가 수행되었다. YAG:DY 형광체를 초음속 연소기 벽면에 코팅하여 온도를 측정하게 하였다. 355 nm 의 파장을 가진 Nd:YAG 레이저를 사용하여 형광체를 여기시키고 이때 발생하는 형광신호를 분광기 및 ICCD 카메라로 측정하였다. 형광체에서 발생되는 두 개의 신호 (450 nm, 480 nm) 비는 온도가 증가함에 따라서 직선형으로 증가하였다. 교정로의 온도를 200 도에서 800 도 까지 바꾸면서 온도장을 측정하였고 각 온도에서 균일한 온도장을 획득하였다. 스크램젯 연소기 표면을 냉각시키기 위하여 연소기 벽면 내부에 유로를 설치하여 연료를 주입하고. 벽면의 온도장을 가시화 하였다. 그래서 연료의 주입량에 따른 벽면 냉각특성이 형광온도계로 측정된 온도장을 통해 분석되었다. In this study, to evaluate the regenerative cooling performance in the scramjet combustor, the surface temperature on the combustor wall was visualized. YAG:Dy phosphor was coated on the wall of the supersonic combustor to measure the surface temperature. Nd:YAG laser with a wavelength of 355 nm was used to excite the phosphor, and the fluorescence signal generated. The fluorescence signal was measured with a spectroscopy and an ICCD camera. The ratio of the two signals (450 nm, 480 nm) generated in the phosphor increased linearly with increasing temperature. The uniform temperature was visualized at the specific set temperatures (2000, 400, 600 and 800℃) in the furnace. In order to cool the surface of the scramjet combustor, a flow path was installed inside the combustor wall and the fuel injected through the flow path. Therefore, the wall cooling characteristics of the injected amount of fuel were analyzed through a temperature field measured by a phosphor thermometry.
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