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마이크로폰 어레이를 이용하여 차량 하부에서 발생한 결함의 위치를찾아내는 방법
전종훈(Jong-Hoon Jeon),김양한(Yang-Hann Kim) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
Sound generated from a moving vehicle often carries information on the condition of vehicle, for example, whether it has faults or not, where the fault exists. The latter is possible especially by MFAH(moving frame acoustic holography) and beamforming method. MFAH is applicable to the sound source of pure tone or narrow band noise. For the beamforming method, we have to know what kind of wave the sound source radiates, for example, plane wave or spherical wave. That is, whether the above methods are applicable depends on the characteristics of sound source. To apply these methods to the fault detection, we have to know the characteristics of wave from faults. In this research, a machine diagnosis technique based on the above holographic approaches is introduced to find the position of faults. The signal due to faults is modeled based on the fact that the faults radiate impulsive noise, and analyzed in time and frequency domain. The way how MFAH and beamforming method can be used is introduced to find the position of source.
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.
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.