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도덕희,김동혁,오철,홍성대,박성룡,황태규,Doh Deog Hee,Kim Dong Hyuk,Oh Cheol,Hong Seong Dae,Park Seong Ryong,Hwang Tae Gyu 한국마린엔지니어링학회 2005 한국마린엔지니어링학회지 Vol.29 No.2
Experimental studies on the characteristics of ice slurry flows in a circular pipe is rare due to the deficiency of conventional measurement techniques. In this report the flow characteristics are quantitatively investigated by the use of PIV technique concerning the Ice Packing Factor(IPF) and the power changes of pump motor It was experimentally verified that the power loss does not increase any more at a certain IPF value.
도덕희,김동혁,방광현,문지섭,홍성대,장태현,황태규,Doh Deog Hee,Kim Dong Hyuk,Bang Kwang Hyun,Moon Ji Seob,Hong Seong Dae,Chang Tae Hyun,Hwang Tae Gyu 한국마린엔지니어링학회 2005 한국마린엔지니어링학회지 Vol.29 No.2
Thermo-chromic Liquid Crystal(TLC) particles were used as temperature sensor for thermal fluid flow. 1K $\times$ 1K CCD color camera and Xenon Lamp(500w) were used for the visualization of a Hele-Shaw cell The characteristic between the reflected colors from the TLC and their corresponding temperature shows strong non-linearity A neural network known as having strong mapping capability for non-linearity is adopted to quantify the temperature field using the image of the flow. Improvements of color-to-temperature mapping was attained by using the local color luminance (Y) and hue (H) information as the inputs for the constructed neural network.
스테레오 PTV와 스테레오 PIV에 의한 선박프로펠러 후류측정
도덕희(Deog Hee Doh),황태규(Tae Gyu Hwang),이상준(Sang Joon Lee) 한국가시화정보학회 2007 한국가시화정보학회지 Vol.5 No.2
Stereoscopic PTV and Stereoscopic-PIV measurements have been carried out for the studies of the wake of a ship's propeller. Stereoscopic photogrammetry based on a 3D-PTV principle was introduced using two high-definition cameras(1k × 1k, 30㎐). The arrangement of the two cameras was based on angular position. The pair-matching of the three-dimensional velocity vectors were based on Genetic Algorithm based 3D-PTV technique. The results obtained by both measurement systems have been compared at the advance ratio J=0.88(290 rpm, d=54 ㎜). Turbulent properties have also been compared each other at the same condition.
디지털영상처리기술을 이용한 비접촉식 유체-구조물 연동운동 3차원 측정시스템 개발에 관한 연구
도덕희(DEOG-HEE DOH),조효제(HYO-JAE JO),상지웅(JI-WOONG SANG),황태규(TAE-GYU HWANG),조용범(YONG-BEOM CHO),편용범(YONG-BEOM PYEON) 한국해양공학회 2004 韓國海洋工學會誌 Vol.18 No.4
A simultaneous measurement system that can analyze the flow-structure interaction has been developed. This system consists of four CCD cameras, two for capturing instantaneous flow fields and two for tracking a solid body. The three-dimensional vector fields around a cylinder are measured, while the motion of the cylinder forced by the flow field is measured, simultaneously, with the constructed system. The cylinder is suspended in the working fluid of a water channel, and the surface of the working fluid is forced sinusoidally to make the cylinder bounced. Reynolds number for the mean main stream is about 3500. The interaction between the flow fields and the cylinder motion is examined quantitatively.
단일카메라 스테레오비전 시스템개발과 액적내부유동 3차원 PTV 측정
도덕희(Deog Hee Doh),성형진(Hyung Jin Sung),조경래(Kyung Rae Cho),조용범(Yong Beom Cho),편용범(Yong Beom Pyeon) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.11
Single-Camera Stereoscopic Vision three-dimensional measurement system has been developed based upon 3D-PTV algorithm. The system consists of one camera (1k × 1k) and a host computer. To attain three-dimensional measurements a plate having stereo holes has been installed inside of the lens system. Three-dimensional measurements was successfully attained by adopting the conventional 3D-PTV camera calibration methods. As applications of the constructed measurement system, a water droplet mixed with alcohol was constructed on a transparent plastic plate with the contacted fluid diameter 4mm, and the particles motions inside of the droplet have been investigated with the constructed measurement system. The measurement uncertainty of the constructed system was 0.04㎜, 0.04㎜ and 0.09㎜ for X, Y and Z coordinates.
3D-PTV 와 비접촉식 6 자유도운동 측정시스템에 의한 유체-탄성체구조 연동운동 해석
도덕희(Deog-Hee Doh),황태규(Tae-Gyu Hwang),조경래(Kyeong-Rae Cho),조용범(Yong-Beom Cho),편용범(Yong-Beom Pyeon),백태실(Tae-Sil Baek) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The interaction between the flow fields and the cylinder motion is examined quantitatively. Analysis on a pulsed impinged jet with 3D-PTV system and 6D-Motion Tracking system was made. A pulsed round jet was impinged on a flexible plate and the flow field near the plate was measured with a 3D-PTV system while the motion of the flexible plate was measured with 6D-Motion Tracking system. The measurement system consists of four cameras, a light source (Ar laser) and a host computer. The flow field has been resolved at 500 ㎐ with 1k × 1k pixels with horizontal and vertical cuts of the flow field. The Reynolds number with the nozzle diameter with mean exit velocity was about 20,000. The results obtained by the fully time- and space-resolved measurement can provide unprecedentedly large amount of information from which not only the statistical quantities but also the time evolution of turbulence structures is extracted.