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유전 알고리즘을 이용한 AA6061 알루미늄 판재의 레이저-아크 하이브리드 용접 공정 변수 최적화
장일광(Ilkwang Jang),박영우(Young Woo Park),김항래(Hang Rae Kim),이강용(Kang Yong Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Genetic algorithm has been carried out to develop a new approach for optimization of Nd:YAG laser and MIG hybrid welding parameters. The characteristic of weld ability is dependent on various process parameters. the parameters chosen for current study include laser power, laser focus, traveling speed, wire feed rate, root opening gap, and arc voltage. The Butt welding design were chosen for aluminum alloy 6061-T6 plate and the ultimate tensile strength were measured for evaluating multiple parameters. Base on the results of genetic algorithm, the optimal process parameters were obtained. It is observed that the results obtained by using the optimal parameters are much improved compared to those from the preliminary set of experimental parameters.
Performance Estimation of Adjustable Wall Blower according to the Entering Distance of Nozzle
장일광(Ilkwang Jang),백재호(Jae Ho Paek),장용훈(Yong Hoon Jang) Korean Society for Precision Engineering 2018 한국정밀공학회지 Vol.35 No.5
The soot blowing performance for a wall blower, according to the entering distance of a nozzle from the boiler wall, is evaluated according to a liquid droplet impingement erosion model. This erosion model incorporated the computational fluid dynamics of a jet steam of nozzle, and it uses the pressure and velocity of a jet steam at the furnace wall for several entering distances of the nozzle. A relative erosion rate dependent on the velocity of the jet steam is also introduced. Several cases are compared, as determined according to the entering distance and the number of nozzles. The shaded erosion region, according to the entering distance of the nozzle and the co-injected region, have also been schematized. Specifically, when the entering distance of the nozzle is large, the maximum relative erosion rate is small. However, the soot blowing area is uniformly large, as compared with the case of a small entering distance. This shows that the maximum relative erosion rate is high, but the soot blowing region is small and the shaded regions occur.