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신정우,김성찬,김성준,채동철,이상욱,김태욱,심재열,Shin, Jeong-Woo,Kim, Sung-Chan,Kim, Sung-Jun,Chae, Dong-Chul,Lee, Sang-Wook,Kim, Tae-Uk,Shim, Jae-Yeul 한국군사과학기술학회 2006 한국군사과학기술학회지 Vol.9 No.4
In this paper, full-scale airframe static test of 4-seater canard airplane(the Firefly) was explained. From the results of the structural analysis, 5 design limit loads test conditions and 11 design ultimate loads test conditions were selected. Test loads analysis was performed and test fixtures and load control system(LCS) were prepared to realize the test loads. To protect the test article during the test, the overload protection system was prepared. Strain and deflection values were acquired through the data acquisition system(DAS) to verify the structural analysis results.
김성준(Sung Joon Kim),이상욱(Sang Wook Lee),채동철(Dong Chul Chae),김성찬(Sung Chan Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The radiated sound pressure induced by low-velocity impact is obtained by solving the Rayleigh integral equation. This paper established the sound analysis procedure using impact analysis model. For structurally radiated noise, the sound field is directly coupled to the structural motion. Therefore the impact response should be analyzed. The impact response is computed using the spring-mass model. And the influence of damage on the sound pressure and impacted force history of laminated were investigated. The results show that both radiated sound pressure and impact force history are strongly influenced by damage on laminated.
김성준(Sung Joon Kim),신정우(Jeong Woo Shin),채동철(Dong-Chul Chae) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
An analytical solution has been developed for the impact response of delaminated composite plates. The analysis is based on an expansion of loads, displacements, and rotations in a Fourier series which satisfies the end boundary conditions of simply-supported. The analytical formulation adopts the Laplace transformation technique, requiring a linearization of contact deformation. In this paper, the nonlinear contact stiffness is replaced by a linearized stiffness, to provide an estimate of the additional compliance due to contact area deformation effects. It has been shown that defects such as delaminations may be modeled as spring stiffness. The change in the impact characteristics as this spring stiffness has been investigated theoretically. Predicted impact responses using analytical solution are compared with the numerical ones from the 3-D non-linear finite element model. From the results, it is shown that analytical solution was found to be reliable for predicting the impact response.
우주인터넷과 Delay/Disruption Tolerant Netwoking (DTN) 프로토콜 개발 동향
박주호(Park, Joo-Ho),허윤구(Huh, Yun-Goo),채동철(Chae, Dong-Chul),김영윤(Kim, Young-Yun),조승원(Cho, Seung-Won),류진영(Ryu, Jin-Yeong),유명종(Yu, Myoung-Jong),문귀원(Moon, Guee-Won) 한국항공우주연구원 2015 항공우주산업기술동향 Vol.13 No.1
과거 소수 선진국만의 영역으로 여겨졌던 우주개발은 점차 다양한 국가들이 참여하는 양상을 띄고 있으며, 그 경쟁 또한 치열해지고 있다. 게다가, 국가주도의 우주개발 외에 민간기업들의 우주개발이 두드러지면서, 비즈니스 영역으로써 우주를 활용하려는 움직임도 보이고 있다. 최근 우주인터넷이라는 새로운 사업계획을 발표하며 또다시 세상의 주목을 받고 있는 스페이스 엑스(Space X)가 그 대표적인 예이다. 사실, 우주인터넷이라는 용어는 미국항공우주국(NASA) 및 유럽우주국(ESA)에서 심우주 탐사를 위한 네트워크 개념으로서 이미 사용된 바 있으며, 민간의 우주인터넷과는 개념적으로 다소 차이가 있다. 본 논문에서는 민간에서 추진중인 우주인터넷 계획과 주요 우주선진국의 우주인터넷 개념을 각각 살펴보았으며, Delay/Disruption Tolerant Networking (DTN)기술을 소개하고 그 개발동향을 기술하였다. In the past, just a few advanced countries led in field of space. Recently, however, more and various countries take part in this field and even many private companies expand their business boundary into the space. Early this year, Elon Musk, CEO at Space X, announced new project "Space Internet". National Aeronautics and Space Administration(NASA) and European Space Agency(ESA) also use this term, somewhat different way, as a network for deep space communication technology. In this paper, Space Internet of private company and national agency is described. Delay/Disruption Tolerant Networking (DTN) and related experiments are introduced as well.
박주호(Park, Joo-Ho),조승원(Cho, Seung-Won),김영윤(Kim, Young-Yun),채동철(Chae, Dong-Chul),허윤구(Huh, Yun-Goo),최종연(Choi, Jong-Yeoun) 한국항공우주연구원 2013 항공우주산업기술동향 Vol.11 No.2
우주개발 프로그램은 다른 연구 개발 프로그램들과는 달리, 설계와 개발 등의 과정 외에 시험, 조립 및 검증에 많은 비용과 시간을 소요하고 있다. 이는 한 번 발사를 하면 회수나 수리가 거의 불가능한 우주개발 프로그램의 특수성에 기인한다. 지난 수년간, 우주개발 선진국들은 오랜 역사와 경험을 바탕으로 우주개발프로그램의 전 과정에서 경쟁력 제고를 위해 힘써왔다. 이러한 경향은 위성 시험, 조립 및 검증의 과정에서의 중복적인 장비 개발을 줄이고 효율적인 시험과 운용을 지향하는 노력으로 이어지고 있다. 본 논문은 선진국의 우주개발프로그램관련 시험과정 및 시험장비 개발 정보를 수집하고 분석함으로써 향후 우리나라의 우주프로그램이 나아가야할 방향을 제시하고 있다. Once the spacecraft are launched, it is almost impossible to bring back and repair them again. At this point of view, the AIT (Assembly, Integration and Test) on the ground before launch is very important for all of space programs. Usually, it takes several years and more for thorough examinations because it totally depends on the complexity of the space program. In today"s environment, as demands of cost effective and reliable spacecraft increase, there have been a lot of researches supporting it. Removal of duplicated work, design of efficient test procedure and re-use of test equipments can be good examples. This paper is aimed at describing the recent trends and technologies about electrical ground support equipments in several advanced countries.