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알루미늄 판재의 압출점접합공정에 있어서 접합강도에 관한 연구
이정훈(J. H. Lee),김태현(T. H. Kim),이문용(M. Y. Lee),진인태(I. T. Jin) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
It was studied that two plates of aluminum can be welded by extru-riveting experiments with extru-rivet welding dies, and that the welding strength and metal flow on the welding section were analyzed by computer simulation according to the welding variable such as the diameter of extrusion insert dies. It was known by computer simulation that welding strength on the welding section of plates could be influenced by the diameter of extrusion insert dies. And it was known by experiments that two plates of aluminum can be welded on a spot point on aluminum plate by extru-rivet welding process, and that welding strength is higher and higher if the diameter of extrusion insert die is smaller and smaller, and that welding strength is the highest when diameter of extrusion insert dies is Ø4.2㎜ in the case that the diameter of rivet is 5㎜, when aluminum 5052 two plates with 1.5㎜ thickness and one plate with 3㎜ thickness for rivet plate are used as welding material.
6고조파 주입 PWM을 이용한 3상 승압형 컨버터 고조파저감
이정훈(J. H. Lee),김재문(J. M. Kim),안정준(J. J. Ahn),이정호(J. H. Lee),원충연(C. Y. Won),정동효(D. H. Jung) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
In this paper, six harmonic injection PWM method for reducing total harmonic distortion in single switch three phase discontinuous conduction mode boost converter is presented In the proposed method, periodic six harmonic voltage is injected m the control circuit to vary the duty ratio of the converter switch within a line cycle so that the fifth order harmonic of the input current is reduced. Experimental results are verified by converter operating at 400V/6kW with three phase 140V-220V input.