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중대형 보일러용 FD FAN의 베인 댐퍼 구조 개선에 관한 연구
강봉성(Bong Sung Kang),박율민(Yool Min Park),김성문(Sung Moon Kim),정순재(Soon Jae Jung),유민경(Min Gyung Yoo),장성철(Sung Cheol Jang) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
This study have processed the developing of vane damper with accurate control by using gear which is a flow-control equipment of marine boiler's FD fan on this research. For the developing of vane damper, we have corrected some problem from welding & assembly process by changing the design, and for the case of an emergency case, we have applied the easy disassembly & assembly on that vane damper. Compared to Rink type vane damper in current, we have focused on high efficiency with low price of that new developing damper. For selection of actuator, we have tried to find the propriety with our developing focus. Also, we have developed a jig of assembly processing for high productivity with quality, it caused the best assembly performance with heat-treated & processed parts.
자동차 냉각기 고무호스용 재질에 대한 신뢰성 평가 및 고장메커니즘규명
곽승범(Seung-Bum Kwak),최낙삼(Nak-Sam Choi),강봉성(Bong-Sung Kang),신세문(Sei-Moon Shin) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.5
Coolant rubber hoses for automobile radiators can be degraded and thus failed due to the influence of contacting stresses of air and coolant liquid under the thermal and mechanical loadings. In this study, test analysis was carried out for evaluating the degradation and failure mechanisms of coolant hose materials. Two kinds of EPDM rubber materials applicable to the hoses were adopted: commonly-used ethylene-propylene diene monomer(EPDM) rubbers and EPDM rubbers with high resistance against electro-chemical degradation (ECD). An increase of surface hardness and a large reduction of failure strain were shown due to the formation of oxidation layer for the specimens which had been kept in a high temperature air chamber. Coolant ageing effects took place only by an amount of pure thermal degradation. The specimens degraded by ECD test showed a swelling behavior and a considerable increase in weight on account of the penetration of coolant liquid into the skin and interior of the rubber specimens. The ECD induced material softening as well as drastic reduction in strength and failure strain. However EPDM rubbers designed for high resistance against ECD revealed a large improvement in reduction of failure strain and weight. This study finally established a procedure for reliability analysis and evaluation of the degradation and failure mechanisms of EPDM rubbers used in coolant hoses for automobile radiators.