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도덕희(Doh D. H),김동혁(Kim D.H),조용범(Cho Y. B),편용범(Pyun Y. B) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Turbulent properties of the wake of a circular cylinder was measured. The diameter of the cylinder is 10mm and the Reynolds number is 420. A new 3D-PTV system was constructed and a genetic algorithm (GA) was introduced in order to increase the number of instantaneous three-dimensional velocity vectors. In the GA, two fitness functions were introduced in order to enhance the correspondences of the particles. The measurement system consists of three CCD cameras, Ar-ion laser, an image grabber and a host computer. More than 3000 instantaneous three-dimensional velocity vectors were obtained by the system. The results measured by the constructed 30-PTV system showed Quite good agreements with others.
도덕희(Doh D. H.),이원제(Lee W. J.),조경래(Cho G. R.),편용범(Pyun Y. B.) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
A new stereoscopic PTV was developed using two CCD cameras, stereoscopic photogrammetry based on a<br/> 3D-PTV principle. Virtual images were produced for the benchmark test of the constructed Stereoscopic PTV<br/> technique. The arrangement of the two cameras was bas ed on angular position. The calibration of cameras and<br/> the pair-matching of the three-dimensional velocity vectors were based on Genetic Algorithm based 3D-PTV<br/> technique. The constructed Stereoscopic PTV technique was tested on the standard images of the impinged jet<br/> proposed by VSJ. The results obtained by the constructed system showed a good agreement with the original<br/> data.
도덕희(Doh D. H),황태규(Hwang T.G),조용범(Cho Y.B),백태실(Baek T. S),편용범(Pyun Y.B.) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
3D-PTV measurement was conducted on the wake of a sphere. The Reynolds number is 1130 with the diameter(d=30mm). The measurement system consisted of three CCD cameras, an image grabber, an Ar-Ion laser and a host computer. An eigenvalue analysis was introduced for the analysis on the wake. Statistical turbulent properties were quantitatively clarified using the time-consecutive instantaneous three-dimensional vectors obtained by the 3D-PTV system. The spatial distributions of the sphere wake showed strong elations with spiral motions of the vortcies shedded from the surface of the sphere.
표준영상을 이용한 스테레오 PIV와 스테레오 PTV의 성능비교
도덕희(Doh D. H.),황태규(Hwang T. G.),조용범(Cho Y. B.),편용범(Pyun Y. B.) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The performances of the newly constructed Stereoscopic PTV and Stereoscopic PIV which had been completed based on a 3D-PTV principle are tested using the Standard Images. Virtual images were produced for the benchmark tests of the constructed two Stereoscopic techniques. The arrangement of the two cameras was based on angular position. The calibration of cameras and the pair-matching of the three-dimensional velocity vectors were based on Genetic Algorithm based 3D-PTV technique. The Standard data of LES are on the impinged jet proposed by VSJ. It is shown that the results obtained by Stereoscopic PTV have better reliability than those by Stereoscopic PTV.
표준화상을 이용한 2차원 PIV 와 3차원 PIV 계측 및 성능비교검정
도덕희(Doh D. h),황태규(Hwang T.G),송주석(Song J. S),백태실(Baek.T.S),편용범(Pyun Y.B.) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Quantitative performance test on the conventional 2D-PLV and the hybrid hygular 3D-PIV(Stereosecpic PIV) was carried out. LES Data sets on an impinging jet which are provided on the webpage(http://www.vsj.or.jp/piv) for the PIV Standard project were used for the generation of vitual images. The generated virtual images were used for the 2D-PIV and 3D-PIV measurements. The measurement results showed that the results obtained by 2D-PIV on average values are clouser to the LES date than those those obtained by 3D-PIV, but turbulent properties obtained by 2D-PIV are largely anderestimated than those obtained by 3D-PIV.