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최준민(Joon-Min Choi),김희경(Hui-Kyung Kim),현범석(Bum-Seok Hyun) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Analytical approach is applied to predict temperature of satellite box under worst hot condition from<br/> fairing jettison to separation. The box is tried to solve analytically which is exposed to known<br/> environmental heating condition and has internal heating and irradiation to space. For a single thermal<br/> mass, governing equation for temperature is simplified to 1st order ordinary differential equation(ODE)<br/> by several assumptions. Two cases are considered. The one is for constant mass box and the other is<br/> for mass-varying box. Each case has three different analytical solution by sign of constant term in<br/> ODE. One analytical solution for constant mass is applied to physical launch stage condition. It is<br/> concluded that the present analytical method can be used to quick predict the temperature of a satellite<br/> box and check whether a satellite is safe against space environment during launch stage.
최준민(Joon-Min Choi),현범석(Bum-Seok Hyun),이장준(Jang-Joon Lee),김희경(Hui-Kyung Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Before launching a satellite, space environment test is conducted to validate the satellite performance under the simulated space environment condition. When the payload of satellite is a high resolution optical camera, lots of things should be considered for the test such as contamination, thermal distortion, over- or under-tests, etc. In this paper, several thermal vacuum test methods are introduced for the optical payload satellite to avoid contamination against the optical system and over-test satisfying the predicted space thermal environment. Before the test, the numerical prediction is performed and the prediction results are compared with the test results.
최준민(Choi, Joon-Min) 한국항공우주연구원 2016 항공우주산업기술동향 Vol.14 No.2
우주기술의 발전과 더불어 지구 궤도를 선회하는 우주 폐기물(우주 쓰레기)의 양은 계속 늘어나고 있다. 따라서 매우 중요한 업무를 수행하는 고가의 위성들과 우주 폐기물이 충돌할 위험도 시간이 갈수록 커지고 있다. 이러한 위험을 줄이기 위하여 우주 폐기물의 발생이 최소화 되도록 모든 국가들이 2007년 UN이 승인 한 `우주 폐기물 경감 가이드라인`을 준수하고 더 나아가 이미 존재하는 우주 폐기물을 적극적으로 제거하는 일을 더 이상 미룰 수 없게 되었다. 우주 선진국을 중심으로 우주 폐기물을 제거하는 여러 가지 방식들이 제안되어 왔고 일부는 실현되었으나 전반적으로 아직은 기술의 성숙도가 낮은 단계이다. 이러한 시기에 본 논문은 현재 제안되고 있는 우주 폐기물 제거 방식을 소개하고 이들이 가지고 있는 장점과 단점을 정성적으로 분석하고 있다. With the development of space technology, the amount of space debris continues to increase. Consequently, the collision risks between expensive satellites conducting import tasks and space debris are constantly increasing. In order t mitigate these risks, all the countries should minimize space debris complying with the “space debris mitigation guidelines” with UN approved in 2007. Further, space debris, which already exists, must be actively removed. Space developed countries have proposed various ways to remove space debris and some technologies are realized. However, overall technology maturity is still in low level. In such a time, this paper introduces various ways currently being proposed and qualitatively analyzes pros and cons of them.