리던던시 기법을 활용한 신뢰성 설계 대안 분석

서양우,임재훈,윤정환,남현우,우연정,Seo, Yang Woo,Lim, Jae Hoon,Yoon, Jung Hwan,Nam, Hyun Woo,Woo, Yeon Jeong 한국시스템엔지니어링학회 2021 시스템엔지니어링학술지 Vol.17 No.1

In this paper we proposed the alternative analysis of reliability design using redundancy technique. First, we presented the process for establishing the reliability design alternative analysis process considering the active redundancy and the standby redundancy. and then, the case analysis of A driving equipment was performed in accordance with the reliability design alternative analysis process presented. In case the series reliability design result is not met with the reliability target value. so, the target item for redundancy design of A driving equipment were selected as items with a severity of two or higher. The redundancy design applied with active and standby redundancy techniques were analyzed using BlockSim software. As a result, it was analyzed that reliability design to active redundancy with one of two elements required for A driving equipment is the most efficient compared to the target value of reliability. The results of this study can be usefully used before the reliability design is performed.

무기체계의 안전 설계를 위한 DFMEA 적용에 관한 연구

서양우,오영일,김희욱,김소정,Seo, Yang Woo,Oh, Young Il,Kim, Hee Wook,Kim, So Jung 한국시스템엔지니어링학회 2022 시스템엔지니어링학술지 Vol.18 No.1

In this paper, we proposed the DFMEA Implementation Method for safety design of Weapon System. First, we presented the process for DFMEA. And then, the case analysis of OOO missile was performed in accordance with the process presented. After defining the system requirements of OOO missile, failure definition scoring criteria was set. In order to clarify the definition of failure, the failure was classified into safety, reliability, maintainability and others. After performing the function analysis, the relationship matrix analysis was performed to identify the failure mode according to the function without omission. After clarifying the failure classification, mode of failure, cause of failure and effect were analyzed to calculate the severity, occurrence and detection values. After the action priority was judged, the recommended action according to the failure classification was identified for the determined action priority. The results of this study can be used as a relevant basis for the design reflection and resource re-allocation of stakeholders.

원샷시스템의 신뢰도 성장 계획 설정 방안

서양우,전동주,김소정,김용근,Seo, Yang Woo,Jeon, Dong Ju,Kim, So Jung,Kim, Yong Geun 한국시스템엔지니어링학회 2020 시스템엔지니어링학술지 Vol.16 No.1

In this paper we proposed to develop the reliability growth planning for the One-shot system using the PM2-Discrete model. The PM2-Discrete is the methodology specifically developed for discrete systems and is the first quantitative method available for formulating detailed plans in the discrete usage domain. First, the parameters RG, RI, T, MS and d of the PM2-Discrete model are set. Second, the case analysis was performed on One-shot system A. Third, the input parameter values were applied to drive the R(t) equation. Finally, using RGA 11 Software, the reliability Growth Planning Curve of One-shot system A was constructed. Also, the sensitivity analyses are performed for the changes of model parameters. The results of this study can be usefully used in establishing the reliability growth planning curve of the One-shot system.

유도탄의 신뢰도 예측 모델 개선에 관한 연구

서양우,윤정환,김희욱,김정태,Seo, Yang Woo,Yoon, Jung Hwan,Kim, Hee Wook,Kim, Jung Tae 한국시스템엔지니어링학회 2020 시스템엔지니어링학술지 Vol.16 No.1

Currently, Storage Reliability is analyzed when predicting the reliability of guided missile. However, Mission Reliability and Logistics Reliability should be analyzed according to the definition of reliability in MIL-STD-785B. Therefore, it is necessary to accurately predict the reliability of guided missile based on the definition of reliability. In this paper, we proposed improved the reliability procedure and model for guided missile based on which the definition of reliability considering the mission profile. The proposed model can calculate the final failure rate by applying the ratio of the dormant and storage according to the mission profile. The proposed model has been confirmed to be more accurate than the existing model compared to the actual failure rate value. The results of this study can be useful for applying the reliability prediction to any guided missile.

연속형 시스템의 신뢰성 성장 관리 시험 설계 방안

서양우,윤정환,이승상,엄천섭,Seo, Yang Woo,Yoon, Jung Hwan,Lee, Seung Sang,Um, Chun Sup 한국시스템엔지니어링학회 2020 시스템엔지니어링학술지 Vol.16 No.2

In this paper we proposed the test design method of reliability growth management. First, we presented the process for establishing the reliability growth management test design considering the number of failures and the termination test time. Reliability growth analysis of continuous system was performed in accordance with the test design process presented. In case the reliability test result is not met with the reliability target value after more than three failures occurred, the required test times were analyzed that 1,725 hrs for one corrective action, 1,950 hrs for two corrective actions. If the number of failures is less than three, design a reliability demonstration test according to confidence level 80% and 90% was performed using RGA 11 Software. As a result, it is possible to establish the reliability growth management test design with sufficient use of available resources. The results of this study can be used when establishing a test design for assessment of reliability growth management of all continuous systems.

원샷 시스템의 신뢰성 성장 시험 설계 방안

서양우(Yang-Woo Seo),김희욱(Hee-Wook Kim),김소정(So-Jung Kim),김용근(Yong-Geun Kim) 한국산학기술학회 2021 한국산학기술학회논문지 Vol.22 No.12

본 논문은 원샷 시스템의 신뢰성 성장 시험 설계 방안을 제시하였다. 우선 원샷 시스템의 신뢰성 성장 시험 설계절차를 제시한 후 각각의 세부 활동을 제안하였다. 제안한 절차에 따라 OOO 원샷 시스템에 대하여 신뢰성 성장 시험 사례분석을 수행하였다. 신뢰성 성장 시험 데이터가 고장모드가 동일한 형태가 있기 때문에 데이터 유형은 이산형 데이터 중의 고장모드를 포함하는 순차적 데이터 유형으로 선정하였다. 이 때, 신뢰성 성장 모델은 시험-수정조치-시험을 수행하는 가장 일반적으로 적용되는 Standard Gompertz 모델을 선정하였다. 발사시험 13발에 대한 신뢰성 성장 시험분석 결과는 신뢰성 86.23 %로 목표 값에 미충족되는 결과이었다. 따라서, 추가 발사시험을 통해 신뢰성 목표 값을 만족시키기 위해 대안분석을 수행하였다. 13발 이후의 추가 발사시험이 성공되는 경우는 추가로 2발 발사시험이 필요하며, 신뢰성 값은 91.16 %이었다. 추가 발사시험을 수행하면서 1발이 실패하는 경우는 추가로 5발 발사시험이 필요하며, 신뢰성 값은 90.83 %이었다. 추가 발사시험을 수행하면서 2발이 실패하는 경우는 추가로 7발 발사시험이 필요하며, 신뢰성 값은 90.28 %이었다. 본 연구의 결과는 원샷 시스템의 신뢰성 성장 시험 설계 시 자원 재할당을 하는데 유용하게 활용할 수 있다. 또한, 모든 원샷 시스템의 신뢰성 성장 시험 설계 수립 시에 활용 가능하다. In this article, we propose a method of reliability growth test design for one-shot systems. First, the procedure for the reliability growth test design for the one-shot system was presented. Then, the detailed activities in each step in the procedure were proposed. A case analysis of the reliability growth test was performed on the OOO one-shot system in accordance with the proposed procedure. Since the reliability growth test data has the same failure mode, the data type was selected to be sequential with the mode data containing failure mode among the discrete data. At this time, the reliability growth model used the most commonly used Standard Gompertz model to perform the test-fix-test. The results of the reliability growth test for 13 launch tests showed 86.23% reliability which did not meet the reliability target. So, an alternative analysis was performed to achieve the reliability target through additional launch tests. If additional launch tests after the 13 launch tests do not fail, additional two launch tests were required for the alternative analysis, and the reliability value for this case was 91.16%. If they fail once, additional five launch tests were required, and the reliability value for this case was 90.83%. Furthermore, if additional launch tests fail twice, additional seven launch tests were required, and the corresponding reliability value was 90.28%. The results of this study can be useful in resource reallocation when designing reliability growth tests for a one-shot system. Also, it can be used when establishing the design of reliability growth tests for all one-shot systems.

요구사항 분석에 따른 시스템 아키텍처 설계 사례 연구

서양우(Yang-Woo Seo),남현우(Hyun-Woo Nam),이승상(Seung-Sang Lee),김소정(So-Jung Kim) 한국해군과학기술학회 2023 Journal of the KNST Vol.6 No.2

무고장 시험 기반의 무기체계 신뢰성 시험 적용 방안

서양우(Yang-Woo Seo),전동주(Dong-Ju Jeon),김소정(So-Jung Kim),김용근(Yong-Geun Kim) 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.5

신뢰성 시험은 일정 및 비용의 제약사항에 따라 충분한 신뢰성 시험을 수행하는 것이 매우 어렵다. 이에 따라, 사업 착수 이전에 세부 신뢰성 시험 예산을 포함시켜 신뢰성 시험 업무를 수행해야 한다. 본 논문은 무기체계의 무고장 시험 기반의 신뢰성 시험 적용 방안을 제시하였다. 우선, 무기체계의 무고장 시험 기반의 신뢰성 시험 시료 수 결정을 위한 절차를 제시한 후 사례분석을 수행하였다. 또한, 고장률 값에 따른 신뢰성 시험 시료 수의 영향성을 분석하여 고장률 값 구간에 따른 신뢰성 시험 시료 수를 제시하였다. 본 논문의 결과는 무기체계의 체계개발 수행 시 이해관계자들이 신뢰성 시험 예산 반영을 위한 근거자료로 활용 가능하며, 강건한 무기체계 설계로 운용유지비용 절감을 기대할 수 있다. Performing sufficient reliability testing on schedule and within cost constraints can be very challenging. Accordingly, reliability testing should be carried out by including a detailed reliability test budget prior to the commencement of a project. This paper presents a method for applying a reliability test based on a zero failure test of a weapon system. First, a case analysis was conducted after presenting a procedure for determining the number of reliability test samples based on the zero failure test of the weapon system. The influence of the number of reliability test samples according to the failure rate value was analyzed, and then, the number of reliability test samples according to the failure rate value range was presented. The results of this paper can be used by stakeholders as evidence to reflect the budget for reliability testing when establishing a system for engineering development, and they are expected to reduce operation and support costs by designing a robust weapon system.

운용 형태별 원샷 시스템의 신뢰도 예측 모델 제안

서양우(Yang-Woo Seo),엄천섭(Chun-Sup Um),남현우(Hyun-Woo Nam),전동주(Dong-Ju Jeon) 한국산학기술학회 2022 한국산학기술학회논문지 Vol.23 No.3

본 논문에서는 운용 형태별 원샷 시스템의 신뢰도 예측 모델을 제시하였다. 운용개념에 따른 운용 형태별 원샷 시스템의 신뢰도 예측 모델을 제시한 후 신뢰도 예측을 위한 절차를 제안하였다. 제안한 신뢰도 모델에 대한 사례분석을 통하여 모델간의 차이점을 분석하였다. Operational Model, Mixing Model, Storage Model 순으로 운용환경 조건이 가혹하기 때문에 고장률이 더 높음을 확인할 수 있었다. 따라서, 비운용 시간이 대부분인 원샷 시스템의 고장률은 상당히 적게 산출되기 때문에 운용개념에 따라 세분화하여 신뢰도를 산출해야 한다. 이 결과들을 활용하여 신뢰도 80% 이상 목표 값이 주어질 때 각각의 신뢰도 예측 모델별로 점검 시점을 확인하였다. 운용탄에서는 1년, 혼용탄에서는 1.3년, 저장탄에서는 5.6년 시점에서 점검을 수행해야 하는 결과를 도출하였다. 본 연구의 결과로 제시한 운용 형태별 원샷시스템의 신뢰도 예측 모델을 기반으로 정확한 신뢰도 예측이 가능하다고 판단된다. 따라서, 본 연구는 어떠한 원샷 시스템이든 신뢰도 예측시 모델 기반으로 활용 가능하다. 현 시점에서의 모델들을 한국군 데이터 기반의 모델이 아니라는 제한사항이 있기에 향후에는 한국형 고장데이터를 포함한 보완된 모델을 제시할 필요가 있다. This research proposed a reliability prediction model of One-shot systems by operational mode. The procedure for reliability prediction was proposed after presenting the reliability prediction model for each operational mode according to the operational concept. The differences between models were analyzed through case analysis for the proposed reliability prediction. It was confirmed from the analysis that the failure rate was higher because the operating environmental conditions were harsh. Harshness was low for the operational model, followed by the mixing and storage models in the same order. Since the failure rate of the One-shot system, which has most of the non-operating time, is calculated to be quite small, reliability should be calculated by subdividing it according to the operational concept. Subsequently, each reliability prediction model"s inspection timing was checked using the results of the calculations when a target value of 80% or more reliability is given. The analysis results indicate that the inspection had to be performed every one year for the operational missile, 1.3 years for the mixed missile, and 5.6 years for the storage missile. It is also concluded that accurate reliability prediction is possible based on the reliability prediction model of the One-shot system by operational mode presented. Therefore, this study can be used as a model base while predicting the reliability of any One-shot system. Since the models presently used are not Korean military data-based models, it is necessary to present a supplemented model including Korean-style failure data in the future.

유도탄의 안전도 설계 적용 방안

서양우(Yang-Woo Seo),김희욱(Hee-Wook Kim),이승상(Seung-Sang Lee),김정태(Jung-Tae Kim) 한국산학기술학회 2021 한국산학기술학회논문지 Vol.22 No.7

안전은 시스템의 목표와 요구사항을 수행하는 동안 시스템의 매우 중요한 목표이지만, 무기체계에 보편적으로 적용되고 있지 않다. 무기체계의 안전에 대한 중요성이 증대되고 있으며, 실질적인 대응책이 필요하다. 이에 따라, 무기체계에 대한 안전도 설계 구현시 누락된 안전 요구사항에 대한 위험요인 분석을 완벽히 수행할 수 있는 프로세스를 구축할 필요가 있다. 본 논문은 유도탄 체계의 안전도 설계 적용 방안을 제시한다. 유도탄에 대한 안전도 설계 프로세스를 제시한 후, OOO 유도탄의 사례 분석을 수행하였다. 유도탄 안전 관련 설계 체크리스트를 적용한 예비 위험 요인을 식별한 후, 시스템 설계를 수행하도록 하였다. FMEA 기법을 적용한 위험요인 분석을 수행하여 리스크 평가를 수행하였다. 리스크 수용여부를 결정하기 위하여 리스크 평가 매트릭스를 활용하였다. 그 결과, 탄두 안전 유지, 탄 구속 및 해제, 부스터 연소, 사용자 운용, 점검 및 훈련에 대한 리스크 감소 대책을 수립하였다. 위험요인 감소를 위한 설계 및 안전장치 추가, 매뉴얼 경고 문구 및 교육 수행의 권고사항을 도출하였다. 추가로 주요 기능에 대한 운용유지 측면에서 고장 탐지 방안까지 도출하였다. 본 연구의 결과인 유도탄의 안전도 설계 적용 방안은 어떤 유도탄이든 설계 전에 유용하게 활용될 수 있다. Safety is an important objective of a system when performing its objectives and requirements, but it is not applied universally to weapon systems. The importance of safety for weapon systems is increasing, and practical countermeasures are needed. Therefore, it is necessary to establish a process to perfectly perform a hazard analysis of missing safety requirements in implementing safety design for weapon systems. This paper presents an application of safety design for guided missiles. After presenting the safety design process for guided missiles, case analysis of the OOO missile was performed. First, after identifying the preliminary hazard applied to the design checklist related to guided-missile safety, the system design was carried out. A risk assessment was performed by hazard analysis applying FMEA techniques. The risk assessment matrix was used to determine the acceptance of risk. As a result, risk reduction measures were established for warhead safekeeping, missile restraint and release, booster combustion, user operations, checking, and missile training. The recommendations for adding design and safety devices, warning statements of manual and training are derived to reduce the hazard. In addition, failure detection methods were derived in terms of sustaining major functions. The safety design applications resulting from this study can be useful for the design of any guided missiles.