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정진덕,최성욱,조태환 대한기계학회 2008 大韓機械學會論文集B Vol.32 No.10
To enhance aerodynamic efficiency of the Smart Un-manned Aerial Vehicle(SUAV) during the transition period, wingtip fence is attached at the end of wing. The application of wingtip fence is to reduce the effect of the separated flow caused by the nacelle on the wing especially when the tilting angle of nacelle is more than 30 degrees. To compare the effect of with and without wingtip fence, flow visualization and measurement of the aerodynamic coefficients using the pyramidal type external balance are done. Result of forces and moments measurement shows that the slope of lift coefficient is increased 18% and rolling moment of SUAV especially 60 & 90-degree tilting is changed in favorable manners with wingtip fence.
CRP 를 사용한 추진기관에 관한 연구(Ⅱ) : CRP 의 소음과 유동에 관하여 Noise and Flow of the Counter - Rotating Propeller
정진덕,이동호 한국산업안전학회 1995 한국안전학회지 Vol.10 No.2
Three-dimensional flow measurements were conducted between the rotors of the CRP. To understand mean flow phenomena of the CRP's, the results of the three-dimensional measurements were shown. Interaction noise of the CRP, which increases the overall level of sound pressure in the new propulsion system, is documented by using the double conditional sampling technique. The rear rotor will increase the axial flow between the rotors of a CRP depending upon the relative locations between the forward and the rear rotor blades. The decay and spreading of the forward wakes and the upstream propagation of the rear blade disturbances are shown along with the interaction of the flow disturbances by the two rotors of blades.
스핀넬구조 비당량적 산화물 자성체의 상호작용 에너지 도출
정진덕 陸軍士官學校 1992 한국군사학논집 Vol.43 No.-
Several nonstiochiometric oxide spinel ferrites were prepared by the ceramic method and measured their hyperfine magnetic fields of each sublattice by Mӧssbauer spectroscopy at variable temteratures. With their reduced hyperfine fields obtained with the hyperfine fields at 0˚K, the superexchange interactions between magnetic cations were caculated by the molecular field theory well known for ferrimagnetism. The values of exchange integrals on the nonstoichiometric samples were different from these on the typical spinel ferrites. This means that the vacancies amd the nonmagnetic cations included in the samples affect directly or indirectly the superexchange interactions between the magnetic ions.