http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
노기덕(Ki-Deok Ro),석재용(Jae-Yong Seok) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.1
본 연구에서는 Weis-Fogh 메카니즘의 원리를 응용한 수 종류의 추진모델을 간략하고, 이 추진모델을 기계화한 소위 Weis-Fogh 형 모형선을 제작하여 추진모델 Ⅰ, Ⅱ, Ⅲ의 주행특성과 진동특성을 비교, 검토함과 동시에, 탄성날개가 실선에서도 유효한지 주행실험을 통하여 파악한 것이다, 그 결과를 요약하면 다음과 같다, 추진모델 Ⅱ에 대하여 추진모델 Ⅰ 및 Ⅲ의 추력은 각각 1.31배 및 1.43배의 크기로 발생했고, 선속은 각각 1.20배 및 1.23배 증가했다. 탄성날개를 이용한 추진력 개선은 실선에서도 모든 추진모델에 대해서도 유효했다. 최대진폭 및 RMS 값은 열림각 a=15°에서 가장 큰 값을 나타내며, 열림각 a=30°에서 가장 작게 나타났다. 출력성능 면에서 열림각 a=30°, 추진모델 Ⅲ의 ΔT=0°의 경우가 비교적 추력이 크고, 진동특성도 우수했다. A model of the propulsion mechanism, Ⅰ, Ⅱ, Ⅲ was based on a two-dimensional model of the Weis-Fogh mechanism and consisted of one or two wings in a square channel. The sailing and vibration performance characteristics of model ships were tested to compare with each other. we took results as follow. Thrust of propulsion model, Ⅰ and Ⅲ was increased by 31% and 43%, the speed of model ship by 20% and 23%, When compared to model Ⅱ in same condition. The thrust improvement using the elastic spring wing was effective not only on all models but also in the real ship. The maximum amplitude and RMS were largest at the opening angle α=15° and smallest at α=30° on the vibration of model ship. The thrust of propulsion model Ⅲ with opening angle α=30°, phase ΔT=0° was large, but the amplitude of vibration was small relatively.
노기덕(Ki-Deok Ro),김광석(Kwang-Seok Kim),진해구(Hae-Goo Jin),김영호(Yeong-Ho Kim),제정기(Jeong-Gi Je),정성찬(Sung-Chan Jung) 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
The Flow fields of a ship's propulsion mechanism of Weis-Fogh type was investigated by the PIV. Velocity vectors and velocity profiles around the operating and stationary wings were observed at opening angles of α=15° and 30°, velocity ratios of V/U=0.5~1.5 and Reynolds number of Re=0.52×104~1.0×104. The fluid between wing and channel was sucked in at the opening stage and was jet at the closing stage. The wing at the translating stage accelerated the fluid in the channel. The flow fields of this propulsion mechanism are unsteady and complex, but the flow fields are clarified by flow visualization using the PIV.
노기덕(K. D. Ro),강명훈(M. H. Kang),공태희(T. H. Kong) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The velocity and pressure fields of a ship's propulsion mechanism of the Weis-Fogh type, in which a airfoil moves reciprocally in a channel, are studied in this paper using the advanced vortex method. The airfoil and the channel are approximated by a finite number of source and vortex panels, and the free vortices are introduced from the body surfaces. The viscous diffusion of fluid is represented using the core-spreading model to the discrete vortices. The velocity is calculated on the basis of the generalized Biot-Savart law and the pressure field is calculated from integrating the equation given by the instantaneous velocity and vorticity fields. Two-dimensional unsteady viscose flows of this propulsion mechanism are numerically clarified, and the calculated results agree well with the experimental ones.
노기덕(Ki-Deok Ro),김종현(Jeong-Hyun Kim),천중희(Jung-Hee Chun),배병준(Byeong-Jun Bae),구정호(Jeong-Ho Gu),김성재(Sung-Jae Kim) 한국마린엔지니어링학회 2008 한국마린엔지니어링학회 학술대회 논문집 Vol.2008 No.-
The Flow fields of a ship's propulsion mechanism of Weis-Fogh type are studied in this paper using the advanced vortex method. The airfoil and the channel are approximated by a finite number of source and vortex panels, and the free vortices are introduced from the body surfaces. The viscous diffusion of fluid is represented using the core-spreading model to the discrete vortices. The velocity is calculated on the basis of the generalized Biot-Savart law and the pressure field is calculated from integrating the equation given by the instantaneous velocity and vorticity fields. Two-dimensional unsteady viscose flows of this propulsion mechanism are numerically clarified, and the calculated results agree well with the experimental ones.
노기덕(Ki-Deok Ro),김종현(Jeong-Hyun Kim),천중희(Jung-Hee Chun),배병준(Byeong-Jun Bae),구정호(Jeong-Ho Gu),김성재(Sung-Jae Kim) 한국항해항만학회 2008 한국항해항만학회 학술대회논문집 Vol.2008 No.공동학술
The Flow fields of a ship's propulsion mechanism of Weis-Fogh type are studied in this paper using the advanced vortex method. The airfoil and the channel are approximated by a finite number of source and vortex panels, and the free vortices are introduced from the body surfaces. The viscous diffusion of fluid is represented using the core-spreading model to the discrete vortices. The velocity is calculated on the basis of the generalized Biot-Savart law and the pressure field is calculated from integrating the equation given by the instantaneous velocity and vorticity fields. Two-dimensional unsteady viscose flows of this propulsion mechanism are numerically clarified, and the calculated results agree well with the experimental ones.
노기덕(Ki-Deok Ro),김광석(Kwang-Seok Kim),김종현(Jong-Hyeon Kim) 대한기계학회 2008 大韓機械學會論文集B Vol.32 No.7
The Flow characteristics of a ship's propulsion mechanism of Weis-Fogh type, in which a airfoil(NACA0010) moves reciprocally in a channel, were investigated by the PIV. Velocity vectors and velocity profiles around the operating and stationary wings were observed at opening angles of α=15° and 30°, velocity ratios of V/U=0.5~1.5 and Reynolds number of Re=0.52×104~1.0×104. As the results the fluid between wing and wall was inhaled in the opening stage and was jet in the closing stage. The wing in the translating stage accelerated the fluid in the channel. And the flow fields of this propulsion mechanism were unsteady and complex, but those were clarified by flow visualization using the PIV.