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강소성 유한요소법을 이용한 링 압연 공정에서의 폭 퍼짐량 및 접촉영역 예측
고영수,윤환진,김낙수,Ko, Young-Soo,Yoon, Hwan-Jin,Kim, Nak-Soo 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.12
The ring rolling process involves three-dimensional non-steady material flow and continuous change of radius and thickness of the ring workpiece. In this study, the deformation analysis and geometric updating algorithm of the ring rolling process were verified by using the three-dimensional rigid-plastic finite element method. Manufacturing processes for plain ring and T-shaped ring were investigated by comparing experiments with simulation results, especially in side spread, load-stroke and pressure distribution, showing a good agreement. It was concluded that the simulation method would be a useful tool for the design of a ring rolling process.
소윤환 ( Yoon Hwan So ),강동환 ( Dong Hwan Kang ),김일규 ( Il Kyu Kim ),김병우 ( Byung Woo Kim ),윤환진 ( Hwan Jin Yoon ),김시현 ( Si Hyeon Kim ),손용석 ( Yong Seok Son ),신정현 ( Jung Hyeon Shin ),안정우 ( Jeong Woo Ahn ) 한국환경과학회 2017 한국환경과학회지 Vol.26 No.2
This study investigated the characteristics of variations in carbon dioxide concentration and air temperature with the vertical change of surface in a grassplot. Field observations were carried out at a grassplot in Gyeongnam Science High School, over four days in August and November, 2015. Continuous observation equipment (GMP343, VAISALA) was installed at the LP (0.1 m from the surface) and UP (1.1 m from the surface) points, and the carbon dioxide concentration and air temperature were measured simultaneously at 1-min intervals. To summarize the results of the observation, August had higher than average concentrations of carbon dioxide, while November showed average air temperatures. Moreover, the concentration of carbon dioxide was higher at the UP point, while the air temperature was higher at the LP point. The correlation coefficient of carbon dioxide concentration between the UP and LP points was 0.80 in August across all the four days, while it was higher in November at 0.58 0.95. The results of the regression analysis of carbon dioxide concentration with air temperature changes for both August and November showed a distinct change at the LP point (R2=0.36 0.76), as compared to the UP point (R2=0.1 0.57). Between the UP and LP points, the carbon dioxide concentration and air temperature regression analysis results indicated that an active exchange was taking place between the two points.