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도덕희(Doh D.H.),조용범(Cho Y.B.),편용범(Pyeon Y.B.),권순홍(S.H. Kwon),이정한(Lee J.H.),황윤식(Hwang Y.S.),류민철(Ryu M.C.) 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
The sloshing flows in the cargo tank model of a ship are measured by PIV and are analyzed with the results. The measurement system is consisted of a Nd-Yag laser(120mJ, 15㎐), two cameras(1k × 1k) and a host computer. Four experimental cases were tested for the tank model, in which swaying motions are made by 6 DOF-motion platform. The amplitudes of swaying are 9.76㎜ and 29.29㎜, and the frequencies are 0.633㎐ and 0.828㎐. The measurement regions are the vertical plane 50㎜ away from the front wall of the tank where a pump tower is installed. It was verified that the flow patterns of the sloshing are similar each other when the swaying amplitudes are similar.
Drilling Characteristics of PVC Materials
J.Y Byun(변재영),Na-Ram Park(박나람),S.W Chung(정성원),S.H Kwon(권순홍),S.G Kwon(권순구),J.M Park(박종민),J.S Kim(김종순),Won-Sik Choi(최원식) 한국기계가공학회 2015 한국기계가공학회지 Vol.14 No.1
This paper develops and evaluates a mechanical machining process which involves drilling on PVS material. According to the material, two treatment experiments were conducted, one involving drilling in a wet condition or using a lubricant and one involving drilling in a dry condition with no lubricant. Drilling in a dry condition showed better performance in terms of the cutting time than in the wet condition. Otherwise, the wet condition has several advantages. The lubricant influenced the burr diameter size and minimized the temperature on the surface of the work piece. During the wet condition drilling process, a smaller burr diameter size was noted as compared to the dry condition. The temperature showed a linear correlation with the drill bit size, where a least-square analysis provided an R<SUP>2</SUP>valuewhichexceeded 0.95. The wet condition required more cutting time than the dry condition. In this condition, the water provides a lubrication effect. A thin layer between the cutting edges and the surface of the work piece is formed. The chip formation is affected by the drilling depth. The color on the tips of the chips was darker than in the initial condition. No correlation between the drilling depth and the bore roughness was noted, but the variation of the cutting speed or the RPM influenced the roughness of the bore. The optimum cutting speed ranged from 40 RPM to 45 RPM in the condition which provided the finest roughness surface.