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이동 프레임 음향 홀로그래피를 이용한 주행 중인 차량의 베어링 결함 위치 추정
전종훈(Jeon, Jong-Hoon),박춘수(Park, Choon-Su),김양한(Kim, Yang-Hann),고효인(Koh, Hyo-In),유원희(You, Won-Hee) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.8
This paper deals with a bearing faults localization technique based on holographic approach by visualizing sound radiated from the faults. The main idea stems from the phenomenon that bearing faults in a moving vehicle generate impulsive sound. To visualize fault signal from the moving vehicle, we can use the moving frame acoustic holography [Kwon, H.-S. and Kim, Y.-H., 1998, 'Moving Frame Technique for Planar Acoustic Holography,' J. Acoust. Soc. Am. Vol. 103, No. 4, pp. 1734${\sim}$1741]. However, it is not easy to localize faults only by applying the method. This is because the microphone array measures noise(for example, noise from other parts of the vehicle and the wind noise) as well as the fault signal while the vehicle passes by the array. To reduce the effect of noise, we propose two ideas which utilize the characteristics of fault signal. The first one is to average holograms for several frequencies to reduce the random noise. The second one is to apply the partial field decomposition algorithm [Nam, K.-U., Kim, Y.-H., 2004, 'A Partial Field Decomposition Algorithm and Its Examples for Near-field Acoustic Holography,' J. of Acoust. Soc. Am. Vol. 116, No. 1, pp. 172${\sim}$185] to the moving source, which can separate the fault signal and noise. Basic theory of those methods is introduced and how they can be applied to localize bearing faults is demonstrated. Experimental results via a miniature vehicle showed how well the proposed method finds out the location of source in practice.
유체내 전기선폭발에 의한 그래핀-은 나노유체 제조 및 특성
전종훈(Jong-Hoon Jeon),김지혜(Ji-Hye Kim),최부영(Bu-Young Choi),노정필(Jung-Pil Noh),허선철(Sun-Chul Huh) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
A graphene-silver nanofluid was prepared by using an electric wire explosion method to coat the graphene particles with silver nanoparticles. The number of times of explosion was set as a variable and the concentration of silver nanoparticles was made different. The properties of graphene - silver nanofluid were confirmed by using thermal conductivity and TEM and SEM. As a result, it was confirmed that graphene grains were attached to silver nanoparticles, and the change in thermal conductivity was confirmed based on distilled water.
In-line subsea separator 형상 최적화에 관한 연구
전종훈(Jong Hoon Jeon),김현지(Hyun Ji Kim),김영주(Young Ju Kim),허선철(Sun Chul Huh) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
The in-line type subsea separator generates a swirling flow inside the tube and separates the fluid by the centrifugal force. In this study, turbulence characteristics were confirmed after the flow analysis according to the exit angle and number of vanes of the swirl flow system, and the shape was optimized using ANSYS designxplorer. The separation efficiency was confirmed by the flow analysis of the optimized shape.