STUDY OF RCM-BASED MAINTENANCE PLANNING FOR COMPLEX STRUCTURES USING SOFT COMPUTING TECHNIQUE

손영탁,김배영,박기준,이호용,서명원,김현준 한국자동차공학회 2009 International journal of automotive technology Vol.10 No.5

To guarantee the efficiency of maintenance strategies for a complex structure, safety and cost limitations must be considered. This research introduces RCM-based (Reliability Centered Maintenance) life cycle optimization for reasonable maintenance. The design variable is the reliability of each part, which consists of a complex structure, while the objective is to minimize the total cost function in order to maintain the system within the desired system reliability. This research constructs the cost function that can reflect the current operating condition and maintenance characteristics of individual parts by generating essential cost factors. To identify the optimal reliability of each component in a system, this paper uses a Neuro-Evolutionary technique. Additionally, this research analyzes the reliability growth of a system by using the AMSAA (Army Material Systems Analysis Activity) model to estimate the failure rate of each part. The MTBF (Mean Time Between Failure) and the failure rate of the whole system, which is responding to the individual parts, are estimated based on the history data by using neural networks. Finally, this paper presents the optimal life cycle of a complex structure by applying the optimal reliability and the estimated MTBF to the RAMS (Reliability, Availability, Maintainability, and Safety) algorithm. To guarantee the efficiency of maintenance strategies for a complex structure, safety and cost limitations must be considered. This research introduces RCM-based (Reliability Centered Maintenance) life cycle optimization for reasonable maintenance. The design variable is the reliability of each part, which consists of a complex structure, while the objective is to minimize the total cost function in order to maintain the system within the desired system reliability. This research constructs the cost function that can reflect the current operating condition and maintenance characteristics of individual parts by generating essential cost factors. To identify the optimal reliability of each component in a system, this paper uses a Neuro-Evolutionary technique. Additionally, this research analyzes the reliability growth of a system by using the AMSAA (Army Material Systems Analysis Activity) model to estimate the failure rate of each part. The MTBF (Mean Time Between Failure) and the failure rate of the whole system, which is responding to the individual parts, are estimated based on the history data by using neural networks. Finally, this paper presents the optimal life cycle of a complex structure by applying the optimal reliability and the estimated MTBF to the RAMS (Reliability, Availability, Maintainability, and Safety) algorithm.

철도차량시스템의 위험기반 RAMS 평가에 관한 연구

박문규(Mun-Gyu Park),한성호(Seong-Ho Han) 대한전기학회 2015 전기학회논문지 P Vol.64 No.4

Rolling stock RAMS is a field of engineering which integrates reliability, availability, maintainability and safety (RAMS) characteristics into an inherent product design property through rolling stock system engineering process. It is implemented to achieve operational objectives successfully, and recently the RAMS has become a rapidly growing engineering discipline because it has a great potential to ensure safety and improve cost effectiveness. However, the Korean rolling stock industry has not yet implemented RAMS management in the rolling stock engineering process, despite the issue having been addressed since the introduction of the KTX. Thus, this paper discusses the processes, methods and techniques for RAMS assessment in three parts. Firstly, it outlines a process of the overall RAMS performance assessment for achieving technical RAMS design criteria. Secondly, it discusses a process for assessing the operational RAM and allocating the RAM. This paper also proposes a model for assessing safety-based risk management, which includes five analytic techniques for identifying the causes and consequences of a system failure. Finally, a case example is provided for the risk assessment of the pneumatic braking device.

야전운용제원 RAM 분석 결과를 활용한 함정 배수량과 신뢰도의 상관관계에 관한 연구

조은별(Eun-Byeol Jo),정영인(Young-In Jung),하성철(Sung-Chul Ha) 한국신뢰성학회 2023 신뢰성응용연구 Vol.23 No.1

Purpose: To examine the correlation between warship displacement–associated with total life cycle cost and warship capability–and reliability using field data Reliability, Availability, and Maintainability (RAM) analysis results. Methods: The Defense Agency for Technology and Quality recorded data on existing warships beginning in 2014. A field data RAM analysis was conducted on the data using Microsoft Excel correlation analysis and trend line. The results were analyzed to determine the correlation between warship displacement and reliability. Results: The correlation between warship light displacement and basic reliability was greater than mission reliability; the correlation between the warship displacement and basic reliability was declining. The basic reliability decreased by -0.0017 as the light displacement increased. Conclusion: The effective target reliability setting method can be discovered by; (1) utilizing the correlation between warship light displacement and basic reliability, (2) conducting additional research to discover other factors affecting reliability and (3) applying various statistical techniques on the data.

경량전철 예비 RAM 분석을 통한 신뢰성 향상방안

박수중(Soo Choong Park),민경세(Kyung Se Min),김동민(Dong Min Kim),박기영(Gi Young Park),김민수(Min Soo Kim) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10

철도서비스 품질을 결정하는 요소 중 RAM 성능향상은 매우 중요한 위치를 차지하고 있다. 특히 무인운전으로 운행되는 경량전철건설사업에 있어 계획단계의 예비 RAM 분석을 통한 높은 수준의 신뢰성확보가 요구되고 있다. 그러나 우리나라의 경우 기존 경량전철시스템의 예비 RAM 분석을 위한 데이터 부족으로 인해 외국 자료 및 외국 사에 의존해왔다. 본 논문은 선 개통되어 운행 중인 부산-김해 경전철의 고장데이터를 분석하여 이 결과를 바탕으로 발생빈도가 높은 시스템 및 장치에 대하여 중점 관리대상 지정 설계 및 제작/시공과정 반영하여 신뢰성을 향상시키는 방안에 대해 논하였다. RAM Performance is the key element in determining quality of railway service. In Particular, high level of RAM management is required for light railway transit construction project with the unmanned operation through preliminary RAM analysis. However, our country has come to rely on foreign firm and data for the existing light railway transit system due to the data insufficient problem of Preliminary RAM. This study aims to suggest improving reliability from Busan-Gimhae light railway transit based on the analysis of high level of failure occurrence frequency system and device taking into consideration the specified design of priority management subject and construction process.

국제표준기반의 철도 RAMS와 인증 프로세스 소개 및 그 적용사례

최요철,Choi, Yo Chul 한국시스템엔지니어링학회 2015 시스템엔지니어링학술지 Vol.11 No.1

The RAMS Process is the Internationally required activity to secure Reliability, Availability, Maintainability, and Safety of system which will be acquired as customer requirements. The importance are situations that have been growing gradually. Specially, When developing railway system, the needs of customer about RAMS Process has been being proposed in a variety of railroad business. Through this paper, It introduces the international standards described the RAMS Process and also presents the requirements that should have to comply with it. Furthermore, the necessary activities to get certificate of a Railway system are suggested and not only the various acquisition cases of certificate but also lessons learned by cases in the field of railway signalling system are presented.

철도 시스템 기능 안전(Functional Safety) 및 인증

김유호(You-Ho Kim),이수환(Soo-Hwan Lee),박강훈(Kang- Hun Park),고태국(Tae-kuk Ko) 대한전기학회 2014 전기학회논문지 P Vol.63 No.4

Nowadays, railroads are considered the most efficient form of mass transportation. Furthermore, it is necessary that railroads be paired with state-of-the-art safety equipment. Unfortunately, it is impossible to prevent 100% of accidents that may be caused by system or human errors. In order to prevent future accidents, RAMS activity and Functional Safety Certification are required for new systems that are under development. In this paper we evaluate the necessity of the application of RAMS and the performance of RAMS in the system development process. We also explore the Safety Evaluation Procedure required for RAMS certification.

야전운용제원을 활용한 항공무기체계 RAM 분석 방안 및 사례 연구

하성철(Sung-Chul Ha),한승진(Seung-Jin Han) 한국산학기술학회 2022 한국산학기술학회논문지 Vol.23 No.11

무기체계의 야전운용제원을 활용하여 RAM 분석을 수행하는 것은 대상 무기체계를 운용한 군의 경험을 직접 활용하는 것으로 그 분석가치가 높다고 할 수 있다. 이러한 야전운용제원 기반 RAM 분석 결과는 비단 개발목표의 야전 운용 시 달성여부 확인, 개발목표 설정 등 뿐 아니라 국산 무기체계의 해외 수출 시 군수지원성능을 대표하는 지표로 사용할 수 있다. 본 연구는 야전운용제원을 활용한 항공무기체계 중심의 RAM 분석 방안에 관한 것이다. 분석을 위한 자료의 식별과 수집 그리고 정제 및 보정 방안을 담고 있으며 해당 자료를 통한 RAM 분석 방안 및 절차를 제시하였다. 제안된 방안에 대한 타당성을 확인하기 위하여 00항공기의 개발목표값, 2015년 및 2021년 분석결과를 비교 분석하여 개발값과 군에서 운용하여 얻은 실측값 간의 간극을 확인하였으며 또한 일정 기간 차이를 둔 실측값을 분석하여 차이의 발생원인을 분석하였다. 본 연구결과는 향후 항공무기체계의 야전운용제원 분석 시 하나의 방안으로 활용할 수 있을 것이며 결과물은 유사무기체계 개발 등 항공무기체계 개발 시 기초자료로 활용할 수 있을 것이다. RAM analysis based on field data is a reliable result that reflects the experience of military operators. This result can be used to confirm whether the development RAM goals have been achieved during operation and set the development RAM goals. This paper presents a process and method of RAM analysis based on field data focusing on air force weapon systems. Data collection, processing, and RAM analysis are proposed to analyze RAM. An analysis of 00 aircraft was conducted to confirm the feasibility of the proposed method. The development value, the past results (15) and the present result (21) were compared. As a result, differences were found between these results, and the cause was analyzed. These results can be used as useful basic data for the new development of similar weapon systems.

항만감시체계를 위한 일선 교환 품목(LRU)수준의 RAM 목표값 설정 방법론

조강훈(Kang Hoon Cho),정용호(Yong ho Chung),박희남(Hee Nam Park),박상철(Sang Chul Park) (사)한국CDE학회 2016 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2016 No.동계

RAM of weapons in the defense is an important performance factor and essential to improve the RAM from design to test and operational stage. The previous researches have been studied to establish the RAM goal. The characteristic of harbor underwater surveillance system (HUSS), which is operated in underwater and monitor a wide range, has problems that make it difficult to repair. However, the previous researches commonly do not provide the design criteria of weapon system for enhancing the RAM. This limitation is fatal problem because HUSS requires high reliability. This paper proposes a method of establishing RAM goal for HUSS using allocation and verification in a line replacement unit (LRU) level. The proposed method provides the optimal design criteria and can reduce the development period and cost, improving its RAM through the redesign and part change.

철도안전관리체계 대응을 위한 도시철도 RAMS 활동범위 기준정의 연구

김지찬(Jichan Kim),이경복(Kyeongbok Lee),임경수(Kyeongsu Lim),김현종(Hyeonjong Kim),김기원(Giwon Kim) 한국철도학회 2016 한국철도학회 학술발표대회논문집 Vol.2016 No.10

철도안전관리체계 기술기준 개정에 따라 철도운영기관들은 철도 안전이나 운행에 관련된 주요 안전 부품에 대한 유지관리 활동, 부품관리 및 확보 등 신뢰성 분석을 통해 시행해야 한다. 따라서 모든 철도운영기관은 운영실적 자료를 통한 신뢰성 분석 활동 정립으로 개정된 법령에 대응해야 하지만 일부 차량분야를 제외하고는 자료 확보나 추진 사항들이 미비한 실정이다. 도시철도 시설물에 대해 신뢰성 분석을 위해서는 고장현황 및 유형에 대한 기준을 수립해야 한다. 본 논문에서는 도시철도 운영 현황과 평가기준이 고려된 도시철도 RAMS 통합시스템 구축을 위해 도시철도 운영기관 RAMS 추진계획을 기반으로 설비 별 고장유형 및 범위 관리 현황 분석 후 RAMS 활동범위에 대해 고찰하고자 한다. Railway Corporation shall perform maintenance activities through a reliable analysis of the main railway safety components in accordance with the amendment of the Railway Safety Management System. Therefore, all Urban Rail Corporations need reliable analysis activities through the operating performance data, but the situation is incomplete except for rolling stock. For a reliable analysis on the Urban Railway facilities shall establish the criteria for the status and fault type should be made. This paper is to analyze the condition of urban Rail facilities failure data and to coordinate the activities range of RAMS.

통계 분석을 통한 함정 무기체계 신뢰도 목표값 설정 방안에 관한 연구

조은별 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.6

The warship weapon system is characterized by no prototype and faster decision-making time than other weapon systems because of this characteristic. This rapid decision-making is the same in the defense RAM (Reliability, Availability, and Maintainability) work, particularly in the case of setting the target system reliability, which the warship weapon system requires a System Requirements Review (SRR), but other weapon systems need a Preliminary Design Review (PDR). Therefore, the warship weapon system needs a model for setting the target reliability available at the initial acquisition point. This study proposed a model for setting the warship weapon system target reliability through statistical analysis of field data RAM analysis results conducted by the Defense Agency for Technology and Quality (DTaQ). Among the variables in the early step of acquiring the warship weapon system, independent variables consisting of displacement, maximum speed, and post-delivery year were identified through a correlation analysis. The model for setting the warship weapon system target reliability was developed through multiple linear regression analyses with identified independent variables and system reliability. The model showed an adjusted R-Square of approximately 0.95 and a difference of 0.63% to 12.66% compared to the field data RAM analysis results.