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전창수(Chang Soo Jeon) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.3 No.2
Numerical simulations on the flowfield of lifting chamber for Wing- In-Ground vehicle were performed using Fluent/UNS 4.2 software. The trend of lifting force in lifting chamber and parametric study of geometric and fluid variables were primarily investigated. Selected parameters for investigation are inlet velocity, height between chamber and water level, depth of the skirt, location of inlet, variation of height at bow and stern. Also, air capturing capabilities from downstream of the propeller were evaluated at the air inlet. The lifting force was increased linearly with the increase of inlet velocity and nonlinearly with the decrease of height between the chamber and water level. As for the variation in depth of the skirt, the lifting force was increased with increased depth. It turned out to have very minor effect on lifting force to change the location of air inlet for lifting chamber, installed on top surface. Tilting the vehicle when it was lifted, the lifting forces, generated in each case, showed no appreciable changes.
전창수,Jeon, Chang-Soo 한국전산유체공학회 1998 한국전산유체공학회지 Vol.3 No.2
Numerical simulations on the flowfield of lifting chamber for Wing-In-Ground vehicle were performed using Fluent/UNS 4.2 software. The trend of lifting force in lifting chamber and parametric study of geometric and fluid variables were primarily investigated. Selected parameters for investigation are inlet velocity, height between chamber and water level, depth of the skirt, location of inlet, variaton of height at bow and stern. Also, air capturing capabilities from downstream of the propeller were evaluated at the air inlet. The lifting force was increased linearly with the increased of inlet velocity and nonlinearly with the decrease of height force was increased with increased depth. It turned out to have very minor effect on lifting force to change the location of air inlet for lifting chamber, installed on top surface. Tilting the vehicle when it was lifted, the lifting forces, generated in each case, showed no appreciable changes.
전창수(Chang Soo Jeon) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.3 No.2
Numerical simulations on the flowfield of lifting chamber for Wing- In-Ground vehicle were performed using Fluent/UNS 4.2 software. The trend of lifting force in lifting chamber and parametric study of geometric and fluid variables were primarily investigated. Selected parameters for investigation are inlet velocity, height between chamber and water level, depth of the skirt, location of inlet, variation of height at bow and stern. Also, air capturing capabilities from downstream of the propeller were evaluated at the air inlet. The lifting force was increased linearly with the increase of inlet velocity and nonlinearly with the decrease of height between the chamber and water level. As for the variation in depth of the skirt, the lifting force was increased with increased depth. It turned out to have very minor effect on lifting force to change the location of air inlet for lifting chamber, installed on top surface. Tilting the vehicle when it was lifted, the lifting forces, generated in each case, showed no appreciable changes.
색상 검출방식의 천이 액정법에서 색상 변화 시간 산정의 정확도 향상
신소민(Somin Shin),전창수(Chang Soo Jeon),곽재수(Jae Su Kwak),정용운(Yong Wun Jung) 대한기계학회 2007 大韓機械學會論文集B Vol.31 No.11
In this paper, different criteria for determining hue change time in the hue detection based transient liquid crystals technique were compared. Results showed that methods utilizing threshold of intensity or saturation gave many missing points and quality of the calculated results were strongly depends on the value of threshold. Wider bandwidth in the hue bandwidth method showed better distribution of calculated hue change time, but induced ambiguity in the hue change time. In the time-hue curve fitting method, the distribution of evaluated hue change time was smooth and reasonable, and, by the nature of curve fitting, the noise effect on the hue was successfully considered in calculating of the hue change time. Compared to other methods, it is expected that the time-hue curve fitting method would provide better and accurate hue change time in the hue detection based transient liquid crystals technique.
산업용 유압펌프 및 솔레노이드 밸브 재제조품의 내구성 평가
이규창 ( Kyu-Chang Lee ),박상진 ( Sang-jin Park ),손우현 ( Woo-hyun Son ),전창수 ( Chang-su Jeon ),목학수 ( Hak-soo Mok ) 한국산업융합학회 2021 한국산업융합학회 논문집 Vol.24 No.5
Remanufacturing is one of the most important resource recycling technology in response to resource depletion and environmental pollution. Domestic remanufacturing industry don’t invigorate compared to other advanced countries because of low price and reliability of remanufactured product. In this study, remanufactured hydraulic pump and solenoid valve were evaluated durability by accelerated life test. In order that standard remanufacturing process was developed by core analysis and failure mode and effect analysis. And cores were remanufactured by standard remanufacturing process. For accelerated life test, the evaluation item and criteria were deduced by results of FMEA, reliability standards and enterprise interior criteria. To evaluate durability of remanufactured product, the remanufactured hydraulic pump and solenoid valve were evaluated performance after accelerated life test and the results were satisfied with criteria. This study showed that remanufactured products have a similar level of durability to new products by definition of remanufacturing.
목학수,한창효,전창수,이정훈,이규창,성인철,송재용,Mok, Hak-Soo,Han, Chang-Hyo,Jeon, Chang-Su,Lee, Jung-Hun,Lee, Kyu-Chang,Sung, In-Cheol,Song, Jae-Yong 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.3
In this paper, we analyze the standards of the bolts for maintaining the products. The maintainer don't know the detail information of bolts by seeing the shape of bolts when they repair the products. So they waste much time and cost. To solve the these problem, we propose the new systematical discrimination of bolts. To propose the discrimination code, we divide the shapes of the bolts into four classes(head, internal drive, shank and end). User can fine preferentially similar standards by just the shapes of bolts under the this discrimination code. And, User can find the standards of bolts that they want by using the additional information such as measurements. We will reduce the cost and time for the maintaining the products by using the proposed discrimination code.