• 한국항공운항학회지
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• 제23권4호
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• pp.117-124
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• 2015

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.

• 한국항공운항학회지
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• 제21권3호
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• pp.9-14
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• 2013

Continuous airworthiness system is comprised of regulations and procedures to assure the safety and reliability through the total stage of development, certification and operation of aircraft. The purpose of this system is not only to provide the guidelines that should be kept by manufacturers and operators, but also to evaluate the maintenance capability in every activity of safety related procedures. During the development process of the mid and large size aircraft, operational experience should be reflected systematically for a safer and more reliable product by using the meaningful data base from operation. The relationship of safety roles between manufacturer and operator is mutually complementary, and the roles of each function have an influence to the next step. Overall structure of the procedure contains the concept of continuous analysis and feedback to achieve highest degree of safety and reliability during the entire life of aircraft. Finally, this paper describes how the feedback is made and used for aircraft design from operational experience under the continuous analysis and surveillance system.

• 한국항공운항학회지
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• 제27권4호
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• pp.21-26
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• 2019

The purpose of this study is to suggest a method for the efficient preventive maintenance of aircraft gas turbine engine turbine blades. For this study, the types and characteristics of gas turbine engines and its turbine blades were studied, the turbine blade defect types that caused an In-Flight Shut Down(IFSD) were analyzed, the blade failure rate according to the blade life cycle was analyzed through the Weibull distribution, one of the statistical techniques. Through these research results, it is possible to supplement the problems of the life cycle management and maintenance method of the turbine blade, and to suggest the measures to strengthen the preventive maintenance of the turbine blade. In this analysis, when total cycle of turbine blade exceeds 18,000 cycles, the failure rate is over 98%, and then the special management measures are required.

• 한국신뢰성학회지:신뢰성응용연구
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• 제3권1호
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• pp.73-82
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• 2003

Reliability Centered Maintenance(RCM) was initially developed for the commercial aviation industry in the late 1960s and now is equally applicable to a variety of equipment other than aircraft. RCM is a method for establishing a preventive maintenance program which will efficiently and effectively allow the achivement of the the required safety and availability levels of equipment and structures. RCM provides for the use of a decision logic tree to identify applicable and effective preventive maintenance requirements for equipment and structures according to the safety, maintenance requirements for equipment and structures according to the safety, operational and economic consequences of identifiable failures, and the degradation mechanism, reponsible for the those failures. The end result of working through the decision logic is a judgement as to the necessity of performing a maintenance task. In this paper, we provide guiding principles based on IEC 60300-3-11 for RCM analysis methods and operational method of structure and equipment.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2020년도 제61차 동계학술대회논문집 28권1호
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• pp.273-274
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• 2020

본 논문에서는 부가가치가 높은 군용 장비류의 해외정비품을 국내정비로 전환하기 위한 절차 중 최종 성능평가 절차를 제안하였다. 기존의 절차는 해외정비품의 성능시험을 위한 정비능력 개발시 개발된 국산화 시험장비의 유효성 검증을 위한 명확한 절차가 마련되지 않아 소요군 혹은 실무자에 따라 최종성능평가의 기준이 다른 점이 발생하였다. 따라서 본 연구에서는 통일화된 절차를 연구하여 제안하였다. 제안한 이 절차는 통일된 기준 마련을 통해 해외도입 시험장비와 국산화된 시험장비의 상호 같음을 검증하여 해외로 나가는 정비대상품을 국내정비로 전환하였을 때 품질면에서 동일함을 보증하기위한 중요한 수단이 될 것이라 기대한다.

• 항공우주시스템공학회지
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• 제14권3호
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• pp.32-41
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• 2020

국제민간항공기구(ICAO)는 항공기 등록국가별 정비조직인증 및 감독활동에 대한 산업계 및 항공당국의 중복 업무 및 규제부담을 경감할 목적으로 정비조직인증 국제인정(AMO Global Recognition)체계에 대한 로드맵을 2015년에 제시하였다. 이후 ICAO는 2024년 이 체계 시행을 목표로 ICAO 표준 및 지침서등을 순차적으로 개정하고 있다. 우리나라는 ICAO의 로드맵 대응 목적뿐만 아니라 국내 항공정비산업(MRO)의 발전을 위해서도 정비조직인증 국제인정체계를 적극적으로 준비하여야 한다. 이에 본 논문에서는 정비조직인증의 핵심 분야인 업무한정체계에 대한 ICAO 표준 검토 및 항공선진국 제도와 국내 제도를 비교분석하여 차이점 및 보완사항을 식별하고 관련 법규의 개선 방향을 제시하였다.

• 항공우주시스템공학회지
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• 제14권5호
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• pp.130-138
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• 2020

본 논문에서는 항공 MRO와 해군함정 MRO 산업의 기술공통점을 찾아 국내 MRO 산업규모를 확대할 수 있는 방안을 제시했다. 항공 MRO산업는 유럽과 북미, 싱가폴에서 주도하고 있다. 유럽과 북미는 항공산업 규모가 매우 크다. 그리고 싱가폴에서 MRO산업이 발전한 이유는 항공 MRO와 선박 MRO 산업이 모여 산업규모를 확대했기 때문이다. MRO분야는 연구개발, 생산, 제조, 운용, 폐기 및 승조원 교육훈련까지 전 분야에 걸친 산업이다. MRO산업은 군수용과 민수용으로 구분된다. 하지만 대부분 사용자의 요구사양 차이일 뿐 기술적 차이는 크게 없다. 군이 사용하는 무기체계는 꾸준하게 발전하고 있다. 병력이 감축되는 시기에 군이 모든 장비를 유지보수 하는 것은 불가능하다. 그 때문에 각 분야별로 역할 분담 필요하다. 모든 무기체계를 최적 성능으로 유지하기 위해 민과 군이 협력하는 MRO 산업 필요하다. 그리고 MRO 산업육성은 민수를 기반으로 이뤄져야 한다. 항공기와 해군함정에서 공통적으로 사용되는 장비를 모아 MRO 산업규모를 확대해야 한다. 이를 통해 군의 가용성 확대와 정비예산을 절감할 수 있다.

• 한국항공운항학회지
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• 제18권4호
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• pp.38-43
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• 2010

A continuing challenge in the aviation industry is how to safely keep aircraft in service longer with limited maintenance budgets. Therefore, all the advanced countries in aircraft technologies put great efforts in prediction of failure rate in parts and system, but in the domestic aircraft industry is lack of theoretical and experimental research. Prediction of failure rate provides a rational basis for design decisions such as the choice of part quality levels and derating factors to be applied. For these reasons, analytic prediction of failure rate is essential process in developing aircraft structure. In this paper, a procedure for prediction of failure rate for aircraft structural parts is presented. Cargo door kinematic parts are taken to illustrate the process, in which the failure rate for Hook part is computed by using Monte Carlo Simulation along with Response Surface Model, and system failure rate is obtained afterwards.

• 한국항공운항학회지
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• 제18권3호
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• pp.84-91
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• 2010

New aircraft category such as Light Sport Aircraft is introduced to prevent Ultralight Vehicle accidents and to promote aviation sports. Therefore, a new rule for airworthiness standard, certification, operation and maintenance of light sport aircraft is being created. The present study deals with LSA concept, development trend of LSA, airworthiness standards and certification policy. In particular, an aircraft type analysis of FAA certified LSA is conducted to establish performance requirements of Light Sport Aircraft designs.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.38-46
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• 2011

Recently railway operators are doing a lot of researches and studies in order to apply reliability technologies to their maintenance tasks. The maintenance in the aviation and the munitions industry has been developed enough to be benchmarked with the high quality reliability technologies; however, railway industry is still situated in a rudimentary stage with insufficient & limited data. 5678 Seoul Metropolitan Rapid Transit Corporation, which has 17 year experience of the EMU maintenance and system development, has made a constant effort for appling RCM (Reliability Centered Maintenance) to the maintenance for a few years. In this connection, the case study is to be introduced. This paper is based on 'RCM Gateway to World Class Maintenance' by Anthony M. Smith". The reliability technology are applied to the specific EMU and its system by 7 stages; accordingly, applying SMRT's maintenance experience, a unique standard for FMEA(failure mode effect analysis) & LTA(logical tree analysis) is established. Moreover, for reasonable and effective preventive maintenance tasks, the case considering an analysis of failure effects is selected in the final step 7. SMRT will develop reliability technologies through the application of the results to all the EMU systems.