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盧勝男 서울産業大學校 1986 논문집 Vol.24 No.1
Eddy Current Testing is better method than Ultrasonic Testing or X-ray Testing method, to find a defect and to mesure a thickness of small pipe in bending and corrosion. In this paper, the best frequency is decide by phase angle and character of various coil impedance according to change of diameter and thickness in stainless pipes. The result of the experiment show that the phase angle of defect signal in increased with decreasing the standard depth of defect. And it's aspiration is to use in Eddy Current Testing of nonmagnetic pipes.
小形動電型굽힘 疲勞試驗機에 의한 貫通균열의 成長 및 닫힘 擧動
盧勝男,朴光洙,辛龍承,徐成源 서울産業大學校 1993 논문집 Vol.38 No.1
This study covers the examination of through crack growth behavior in high strength aluminium alloy 7075-T651. The crack was fatigued by a small-sized Electrodynamic type bending test machine. Experiments were carried out by using cantilever beam type specimens with an initial chevron shaped notch, at various stress ratios(R=-0.1, 0.0, 0.1, 0.3, 0.5). Crack growth and crack closure were detected by means of Kikukawa's compliance method with a strain gauge mounted on the backside of each specimen.
CAM 시스템에서 시뮬레이션을 利用한 非對稱形 캠의 旋削加工
노승남,오선 서울産業大學校 産業大學院 1997 大學院論文集 Vol.5 No.-
In the case of Non Circular Turning for instance cam shaft, the process is further complicated by the fact that the cutting parameters are continuously varying as function of position and other parameters. As the existing turning models assume these parameters to be constant, they are not capable of handling this simulation. The major difference in the NCTP and existing turning model is that in the case of NCTP as the tool is actuated in the radial direction, the effective cutting parameters like back rake angle and clearance angle are varied. This paper used TESTBED program that developed for non circular turning simulation.
노승남,윤종학 한국공작기계학회 1997 한국생산제조학회지 Vol.6 No.2
The discrimination of flaw shape and sizing is very important subject in the material evaluation for semiconductor and new materials. The aim of this paper is to investigate the spectrum analysis of artificial defect captured from steel ball embedded in the resin. The results show that it can be evaluated quantitatively the size of artificial defect, from the amplitude variation of same frequency if the probe with same diameter and focal length is used. Comparing with the amplitude variation of the high frequency component and low frequency component obtained from the distance of defect center position, it can be estimated steel ball and flat bottm defect.
특수공작기계에서 쇼트피닝기의 특성 및 투사속도에 관한 연구
노승남,이승호,서유원 서울산업대학교 산업대학원 2000 大學院論文集 Vol.7 No.-
As developing the technology in industry, the materials with superior grade of stiffness and lightness are required, and hence the higher fatigue strength characteristics are necessary. Thus, the non-traditional machining to increasing fatigue strength is becoming influence as very important technology. Shot peening process is essential to ensure repeatability and uniformity on a part to part and lot to lot basis, while conforming to the applicable specifications. The shot material, size, shape and hardness as well as velocity and impact angle must be rigidity controlled to provide consistency in peening results. High velocity of the shot ball increases the impact energy, the shot peening intensity increase. Comparing with the are height for the velocity 42m/sec, the are height for 56m/sec and 70m/sec increase 33% and 48% respectively.