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차세대 전투기 Sensor Pod 장착 위치 선정에 관한 연구
김영춘,양청일,양창건,신항철 한국항공우주학회 2016 한국항공우주학회 학술발표회 논문집 Vol.2016 No.4
미래의 항공기는 다양한 시스템들이 복잡한 구조로 구성되어 있으며 각 시스템들이 유기적으로 동작할 때 비로소 그 목적에 맞게 운영될 수 있다. 이런 다양하고 복잡한 시스템들로 구성된 차세대 항공기를 개발하는 과정 중, 항공기 외부에 장착되는 센서의 성능을 극대화하기 위한 위치 선정은 중요한 과정이다. 본 논문은 저고도 침투를 통한 정밀 타격 임무 수행에 필수적인 Navigation Pod 와 EO Targeting Pod 에 대해 Obscuration 해석 프로그램을 통한 LOS Blockage 분석과 항공기 체계 통합요구사항 검토를 통해 최적의 장착 위치 선정에 관해 연구하였다. The future aircraft is composed of the various systems which are complicated structure and can be operating when each system are operating organically. In the development process for next generation aircraft consisting of these various and complicated system, the analysis the operating requirement to install on the optimal position of the aircraft is the essential process in order to maximize the unique performance of subsystem. In this study, we researched optimized position through LOS blockage analysis using the obscuration analysis program and review aircraft system integration requirement regarding Navigation Pod and EO Targeting Pod that is the essential equipment to the low altitude ingress and precision attack mission.
온도 변동하의 Al 7075 합금의 크리이프 및 파단수명
강대민,구양,백남주,김창건,박경동 한국산업안전학회 1989 한국안전학회지 Vol.4 No.1
Cyclic temperature creep tests were carried out an Al 7075 alloy specimens were subjected to a constant load and step-wise temperature cycles in which temperature was fluctuated between 300℃ and 250℃ with three different cycle ratios. The highest frequency of cycling was 1 cycle per 10 hr and the lowest one was 1 cycle per 12 hr. From the creep experimental results with the above conditions the creep strain under cyclic temperature can be predicted easily by introducing the equivalent steady temperature Te as defined by Eq.(16), but the rupture life is 1.1 time than those of constant temperature because of effect of temperature history at tertiary creep range. Besides this result, the results of the creep test under cyclic temperature conditions are respectively compayied with calculated rupture lives using the life fraction law and Eq.(18). The agreement between the obseried rupture times and calculated ones is fairly good. So creep rupture lives can be respectively predicted using life fraction law and Eq.(18).