A Research of Applying RAM-c to Analyze the Design Service Life for Unmanned Aerial Vehicle

무인항공기의 설계사용 수명판단을 위한 RAM-c 적용 연구

Choi, Cheong Ho;Bang, Jang Kyu;Park, Sung Sik

  • Received : 2015.11.05
  • Accepted : 2015.12.20
  • Published : 2015.12.31


RAM (Reliability, Availability and Maintenance) has been applied to design and analysis tools which affects system's operational sustainability and its life cycle cost as RAM-c(2009 DoD). RAM-c plays also an important role to guarantee the system engineering for mission assurance. Reliability is highly related to the probability of system failure. Availability means mission capability or the condition of ready to mission. Maintenance includes both the repair to recover the system in the event of failure/unexpected breakdown and proactive maintenance to prolong the design service life of the system or machinery. It is the purpose that this paper is to analyze and conclude the objective service life of UAV. The more UAV is operated, the less the level of its reliability becomes. Repairing failures and supplying spare parts on time, system reliability could be improved up until the time over target. Applying statistical Weibull distributions, this paper suggests the analysis of the design service life and economic life of UAV based on RAM-c with operational data.


RAM;UAV;System Engineering;Character life


  1. Military Handbook 338, Electronic Reliability Design Handbook, October 1998
  2. 김무영 (2011), "무기체계 시험개발단계에서의 종합군수지원요소 개발 방안에 대한 고찰", 대한 산업공학회 추계학술대회
  3. 최청호 (2013), "무기체계의 신뢰성 기법 적용 방안 : 설계/개발 및 운용단계", 공군본부 총 수명주기 체계관리 세미나
  4. Report of the Defense Science Board Task Force on Developmental Test and Evaluation, May 2008
  5. Department of Defense Instruction, Number 5000.02, Operation of the Defense Acquisition System, December 2008
  6. Waloddi Wei-bull (2012), "Reliability Analysis with Wei-bull," Ed(12), Curt Ullrich Ronniger
  7. C. B. Guure, N. A. Ibrahim, (2013), "Generalized Bayesian non-Informative Prior Estimation of Weibull Parameter with Interval Censoring", Science Asia 39(S) pp. 75-79
  8. J. G. Stotivig, (2014), "Censored Weibull Distribution Data in Experimental Design", Master of Science Thesis in Physics and Mathematics, Norwegian University of Science and Technology
  9. Klutke, G., Kiessler, P.C., Wortman, M. A. (2015) "A Critical Look at The Bathtub Curve", IEEE Transactions on Reliability 52 (1), pp.125-129
  10. US Department of Defense, Guideline for Achieving Reliability, Availability and Maintenability, System Engineering for Mission Success, Aug. 2005
  11. 방장규, 2015, "항공기 엔진의 신뢰성과 안전성 분석", 한국항공운항학회 추계학술대회