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다공성 실리카 겔을 이용한 에너지 소산 시스템의 실험적 연구
전상배(Sang-Bae Jeon),구태완(Tae-Wan Ku),김정(Jeong Kim),강범수(Beom-Soo Kang) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Mechanical damping systems have been widely used to various industrial structures and are mainly hydraulic and pneumatic devices nowadays. This article presents an experimental investigation of a nano colloidal damper. Particularly for colloidal damper, the hydraulic oil is replaced by a colloidal suspension, which is consisted from a nano-porous matrix with controlled architecture and a lyophobic fluid. Nano colloidal damper test rig and the measuring technique of the hysteresis were described in this study. Influence of the water volume and particle diameters upon the nano colloidal damper hysteresis was investigated. As a result, the proposed nano colloidal damper (NCD) is proved as an effective one, which can be replaced for the conventional hydraulic damper.
소액 미세 콜로이드 시스템에서 Wilhelmy method를 적용한 연구
전상배(Sang-Bae Jeon),김정(Jeong Kim),강범수(Beom-Soo Kang) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In this study, colloid suspension system is proposed by using the Wilhelmy method. Surface and interfacial tensions are called static and quasi-static when their values, under constant external conditions, do not change, stop changing or change very slowly. Therefore, they are in or very close to thermodynamic equilibrium. In order to determine these properties, the Wilhelmy method was used. The Wilhelmy method, which means the measurement of resulting force between the surface of the liquid and the immersed plate can determine the surface and interfacial tension of liquids. This method can derive the hysteresis of defect energy.
Reynolds 수가 2단 원추형 5공프로브를 이용한 3차원 유동 측정에 미치는 영향 - 저속 유동장에서의 보정 결과 -
이상우,전상배,Lee, Sang-U,Jeon, Sang-Bae 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.1
The effects of Reynolds number on the non-nulling calibrations of a cone-type ave-type probe in low-speed flows have been investigated at Reynolds numbers of 2.04$\times$10$^3$, 4.09$\times$10$^3$and 6.13$\times$10$^3$. The calibration is conducted at the pitch and yaw angles in ranges between -35 degrees and 35 degrees with an angle interval of 5 degrees. In addition to the calibration coefficients, reduced pitch and yaw angles, static and total pressures, and velocity magnitude are obtained through a typical non-nulling reduction procedure. The result shows that each calibration coefficient, in general, is a function of both the pitch and yaw angles, so that the pre-existing calibration data in a nulling mode are not enough in accounting far the full non-nulling calibration characteristics. Due to interference of the probe stem, the calibration coefficient are more sensitive to Reynolds number at positive pitch angles than at negative ones. The calibration data reduced in this study may serve as a guide line in the estimation of uncertainty intervals resulted from the Reynolds number effects at low Reynolds numbers.
선박용 복합재 에어 스포일러의 체결부 설계 및 강도 평가
피준우 ( June Woo Pi ),전상배 ( Sang Bae Jeon ),이근호 ( Guen Ho Lee ),조영대 ( Young Dae Jo ),최진호 ( Jin Ho Choi ),권진회 ( Jin Hwe Kweon ) 한국복합재료학회 2015 Composites research Vol.28 No.4
선박 분야에서 이산화탄소(CO2) 배출을 줄이고 연료 효율을 높이기 위한 방법의 하나로 항해하는 선박의공기 저항을 줄이기 위한 에어 스포일러를 장착하는 방안이 검토될 수 있다. 본 연구에서는 대형 선박에 적용될수 있는 복합재 에어 스포일러의 체결부를 설계하고, 이에 대한 정적, 피로강도를 평가하였다. 하중은 선박의 운항 중 발생하는 청파(Green Water Pressure) 0.1 MPa이 에어 스포일러에 수직하게 가해지는 것으로 가정하였다. 에어 스포일러는 유리섬유 면재에 발사 코어를 갖는 샌드위치 형태로 제작하였고, 여러 개의 샌드위치 패널이 셀(Cell) 형태로 강(Steel) 프레임에 볼트로 체결되는 것으로 가정하였다. 에어 스포일러와 프레임의 체결부는 베어링 파손을 가지도록 설계하고, 정적(베어링) 시험과 피로(4점 굽힘) 시험을 수행하였다. 시험 결과 개발된 에어 스포일러는 정해진 외부하중을 견딜 수 있는 충분한 안전여유를 갖는 것을 확인하였다. 개발된 에어 스포일러는 조만간 대형 상업용 선박에 적용될 예정이다. Air spoiler, which can reduce the drag during operation, can be considered as a possible means to reduce carbon dioxide emission and to increase fuel efficiency. In this study, a composite air spoiler was designed and tested by static and repeated loads. The Green Water Pressure of 0.1 MPa a ship experiences during operation was perpendicularly applied to the air spoiler. Air spoiler was manufactured with sandwich panel which has glass fabric face and balsa core. Multiple sandwich panels were assembled to steel frame by bolt joint. The joint was designed to have bearing failure and examined by static and fatigue tests. Tests showed that the designed joint has enough margin of safety to endure joint failure. The developed sandwich panel to air spoiler is planned to be applied to a large scale commercial ship.