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응력 구배 효과를 고려한 구름 접촉 모델의 피로수명해석
조인제(InJe Cho),유용훈(YongHun Yu),이보라(Bora Lee),조용주(YongJoo Cho) 한국트라이볼로지학회 2015 한국윤활학회지(윤활학회지) Vol.31 No.6
Recently, Luu suggested fatigue life equation that uses every term of the Crossland equation with stress gradient effect. Luu’s model, however, has a limit of being unable to coverage small radii that are less than a specified length. Furthermore, rolling model has a very small contact area compared to the rolling element size, and fatigue failure occurs on the small radius such as surface asperity by cyclic loading. Therefore, it is necessary to modify fatigue life equation in order to enable fatigue analysis for a small radius. In this paper, the fatigue life considering a stress gradient effect in rolling contact was obtained using Luu’s modified equation. Fatigue analysis was performed to study the effect of stress gradient on the fatigue life using newly adopted equation and to compare the results with pervious models. In order to do this, a series of simulation such as surface stress analysis, subsurface stress analysis, and fatigue analysis are conducted for two rolling balls of same size that contact each other. Through such a series of processes, the fatigue life can be calculated and equation that is proposed in this paper evaluates the fatigue life in case the contact area is small.
오세율(Seyool Oh),성재민(Jaemin Sung),김종섭(Chong-Sup Kim),조인제(Inje Cho) 한국항공우주학회 2016 한국항공우주학회 학술발표회 논문집 Vol.2016 No.4
본 논문에서는 최신의 전투기 적용된 제어법칙을 소개할 것이다. 특히 F-35전투기에 적용된 비선형 동적 역변환에 대해 살펴볼 것이다. 또한 기존의 T-50에 적용된 전통적인 제어법칙과의 차이를 간단히 살펴볼 것이다. 그리고 현재 개발중인 F-16이상의 중급 전투기인 한국형 전투기(KFX) 항공기는 두 개의 수직꼬리날개가 장착되어 조종면이 증가하고, 두 개의 엔진이 장착되어 T-50과 형상이 다르다. 그리고, 조종면을 활용하는 제동기 등을 사용하는 기술이 사용가능성이 있기 때문에 T-50과는 달리 새로운 제어법칙에 대한 연구가 필요하다. 이 논문에서는 또한 현재 개발중인 한국형 전투기(KFX)에 선진제어법칙을 적용가능성을 알아보고자 한다. This paper introduces the advanced control laws which were applied to new advanced combat aircraft. Specifically, advanced technology of nonlinear dynamic inversion on the F-35 “Joint Strike Fighter” aircraft was reviewed in detail. The paper further includes a comparison between the F-35 and its advanced control laws to the T-50 “Golden Eagle” aircraft with its classical control laws. The KFX advanced multirole fighter (intended to outperform the aging F-16 multirole fighter aircraft) has two vertical stabilizers and rudders as well as two engines compared to the F-16’s one. As a result, the number of available control variables is increased in lateral directional modes. Study on advanced control laws is necessary to exploit the capability of a virtual speed brake using the increasing number of control surfaces. This study explores these advanced control laws and shows the future development direction of advanced control laws for the KFX program.