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신광호(Kwangho Shin),최송(Song Choi),정호종(Hojong Jeong),이진우(Jinwoo Lee),양동근(Dong-keun Yang),정백영(Baikyoung Chung) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.11
This study is describing a method for improving reliability and energy efficiency of GHP system. First of all, capacitance level sensor was evaluated for detecting oil level and in the oil separator. As the result of applying the oil level sensor in GHP system, it was confirmed that oil return operation was unnecessary. It provided a continuous heating operation under the sufficient presence of oil in oil separator. Therefore, GHP system applying the oil level sensor was able to reduce energy consumption as compared with the conventional system. Second of all, a control method for the refrigerant charge amount is performed using receiver. The energy efficiency was improved in the cooling and heating mode through changing refrigerant charge amount. The difference of refrigerant charge amount between optimal cooling and heating mode was about 27%, and it was controlled with relationship between high pressure and degree of subcooling.
자동차 크로스멤버 하판넬 제작용 금형 설계를 위한 스프링백 해석
장성호(Sungho Chang),허영무(Youngmoo Heo),신광호(Kwangho Shin),전용준(Yongjun Jeon) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
In this study, the drawing process simulation and springback analysis through using PAM-STAMP, a commercial FEM code were conducted for the lower pannel of Rear cross-member in the sub-frame as a automobile part. And the predicted springback results were compared and checked with the CAD data of the product and the CMM data for the prototype product. As a stamping analysis results, a wrinkling problem was occurred in the side-wall of the lower pannel. As a solution for this wrinkling problem, it was recommanded that two drawing steps, which are 1st stamping and restriking process, is needed. And then as a springback analysis results, the result of deformed shape after springback compared with the CMM data for the prototype product was a little bit different as a quentity, but the springback trend is similar.