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유계형,권대규,정경훈,이성철 한국산업안전학회 2003 한국안전학회지 Vol.18 No.1
This paper presented an experimental modal analysis of clamped perforated rectangular plates submerged in water. The penetration of holes in the plates had a triangular pattern with P/D(pitch to diameter) 1.750, 2.125, 2.500, 3.000 and 3.750. The natural frequencies of the perforated plates in air were obtained by the Rayleigh-Ritz method and compared with the experimental results. Good agreement was obtained between the analytical solution and experimental result. The experimental results in water showed that the mode shapes are not sensitive to the depth of submergence. The natural frequencies were shown to decrease drastically once the perforated plates come in contact with water. However, the natural frequencies decrease with the depth of submergence until a certain depth is reached, and become the asymptotic values beyond this depth of submergence. The depth of submergence did not affect the damping ratio greatly.
유체로 연성된 직사각평판의 거리 변화에 따른 고유진동 해석
유계형,이명규,권대규,이성철 전북대학교 공학연구원 ( 구 전북대학교 공업기술연구소 ) 2002 工學硏究 Vol.33 No.-
This study dealt with the experimental modal analysis of the perforated rectangular plate coupled with fluid. The natural frequencies of the perforated plate and solid plate in air were obtained by the analytical method based on the relation between the reference kinetic and maximum potential energy and compared with the experimental results. Good agreement between the results was found for the natural frequencies of the perforated plate in air. It was empirically found the natural frequencies of the perforated plate coupled with fluid. The transverse vibration modes, in-phase and out-of-phase, were observed alternately in the fluid-coupled system. Additionally, the effect of distance between perforated plate and solid plate on the fluid-coupled natural frequency was investigated.
유계형,정경훈,이성철 한국산업안전학회 2002 한국안전학회지 Vol.17 No.2
In order to investigate the vibration characteristics of fluid-structure interaction problem, we modeled two identical rectangular plates coupled with fluid. A commercial computer code, ANSYS was used to perform finite element analysis and FEM solutions were compared with the experimental results to verify the finite element model. As a result, comparison of FEM and experiment showed good agreement, and the transverse vibration modes, in-phase and out-of-phase, were observed alternately in the fluid-coupled system. The effect of fluid gap size on the fluid-coupled natural frequency were investigated. It was shown that the mode numbers increased, the normalized natural frequencies monotonically increased. And it was also found that an increase of the fluid gap reduced the coupled natural frequencies for the in-phase modes but increased the coupled natural frequencies for the out-of-phase modes, and eventually converged to the results of an infinite fluid gap.
부분적으로 유체가 채워진 원통형 관내의 외팔보 진동특성에 관한 실험적 연구
권대규,유계형,소순선,이성철 전북대학교 공학연구원 ( 구 전북대학교 공업기술연구소 ) 2003 工學硏究 Vol.34 No.-
This paper presents the vibration characteristics of an intelligent cantilever beam in contact with fluid using PZT actuator and PVDF film. The effect of liquid level on free vibration of composite beam in a partially liquid-filled circular cylinder is investigated. The dynamic behaviors of a flexible beam-water interaction system are examined. The coupled system is subject to an undisturbed boundary condition in the fluid domain. In the vibration analysis of wetted beam, the decoupled analyses between beam and fluid have been conventionally employed by considering firstly the composite beam vibration in air and secondly performing the correction taking account for surrounding fluid effects. That is, this investigation was to look at how natural frequencies, mode shapes, and damping are affected by liquid level variations. Using the coupled modal reanalysis method employing the governing equations and the clamped-free and free-free boundary conditions, the vibration analysis of beam in contact with fluid is performed. We also carried out the experimental verification about reliability of theoretical methods to inclusive vibration analysis of the fluid-structure system with PZT actuator and PVDF film. It was found that the coupled natural frequencies decrease with the fluid level for the identical composite beam due to added mass effect.
연료전지 차량용 고압기체수소 저장용기(Type4)개발(설계검증시험)
유계형(Yoo, Gye-Hyoung),주용선(Ju, Yong-Sun),허석봉(Heo, Seok-Bong),전상진(Jeon, Sang-Jin),김종열(Kim, Jong-Lyul),이중희(Lee, Jong-Hee) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
We developed and tested the high pressure hydrogen gas cylinder(type4) for fuel cell vehicle. The working pressure is 350bar. We conducted material tests, production tests and design qualification tests on the developed cylinders according to modified NGV2-2000(hydrogen). The high pressure hydrogen gas cylinder met all the design qualification requirements of ANSI/CSA NGV2-2000 and acquired NGV2 certification from independent inspection agency.
유계형(Gye-Hyoung Yoo),정경훈(Kyeong-Hoon Jeong),이성철(Seong-Cheol Lee) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
In order to investigate the vibration characteristics of fluid-structure interaction problem, we modeled two identical rectangular plates coupled with bounded fluid. The fixed boundary condition along the plate edges and an ideal fluid were assumed. A commercial computer code, ANSYS was used to perform finite element analysis and FEM solutions were compared with the experimental results to modify the finite element model. As a result, comparison of FEM and experiment showed good agreement, and the transverse vibration modes, in-phase and out of-phase, were observed alternately in the fluid-coupled system. The effects of distance between two rectangular plates on the fluid-coupled natural frequency were investigated. And it was found that the normalized natural frequency of the fluid-coupled system monotonically increased with an increase in the number of modes.
연료전지자동차용 초경량 복합재료 탱크의 수소 충전 특성 연구
유계형(Gye-Hyoung Yoo),김종열(Jong-Lyul Kim),이택수(Taek-Su Lee),이중희(Joong-Hee Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In this research, the hydrogen gas filling characteristics of the ultra-light composite tanks that have a plastic liner or an aluminum liner inside the composite shell are investigated in terms of gas and tank temperatures. The temperature changes in various positions in the Type 4 tank during hydrogen gas filling were monitored to understand the effects of the filling conditions. The results was also compared with the results obtained with Type 3 tank. As the filling speed is raised, more stiff temperature rise was observed and the temperature distribution over the entire region became more discrepancy.