• 제목/요약/키워드: Reliability

검색결과 24,185건 처리시간 0.1초

Development of Reliability Engineering in China

  • Zhang, Zengzhao;Pang, Fuli
    • 한국신뢰성학회:학술대회논문집
    • /
    • /
    • pp.3-19
    • /
    • 2006
  • The Status quo of the reliability in China is described in this paper, a reliability surge is now spreading in China, covering the fields such as hardware, software, machinery and electronics. The reliability work in China was firstly conducted by the CEPREI Lab as far as early in the 1950s, and the reliability engineering in China has developed from the reliability of electronic products to that of machinery and non-electronic products, from hardware reliability to software reliability, from the attention to the reliability statistical test to emphasis on the reliability engineering test. Concern of Chinese companies about the reliability is the complete import of reliability engineering, the reliability testing, the software reliability and the reliability of lead-free soldering. Demonstration of reliability cases is given.

  • PDF

원자력 발전소용 공정 제어기의 보증 비용을 고려한 신뢰도 목표치 설정과 신뢰도 분석 결과에 대한 연구 (A Study for Reliability Target Setting Considering Warranty Cost and Reliability Analysis Result of Process Controller in Nuclear Power Plant)

  • 김건명
    • 한국신뢰성학회지:신뢰성응용연구
    • /
    • v.15 no.3
    • /
    • pp.145-148
    • /
    • 2015
  • The products to meet the requirement of are installed in nuclear power plant and the reliability target should be provided in the requirement. However, it is not easy to set a reliability target using quantitative analysis. The objective of this paper is to propose a method of reliability target setting considered warranty cost for process controller and then compare a reliability target with reliability analysis result.

수중유도무기체계의 신뢰도 할당: 사례연구 (A Study on the Reliability Allocation for an Underwater Guided Weapon System: Case Study)

  • 김희욱;이학표;허길환;오근태;김명수
    • 한국신뢰성학회지:신뢰성응용연구
    • /
    • v.14 no.1
    • /
    • pp.29-35
    • /
    • 2014
  • To improve the reliability of a weapon system, we perform the activities: setting the target reliability, reliability allocation, and reliability management, etc. Before starting weapon system development, the target reliability of system is set through advanced research and is allocated to its subsystems at the beginning of development. Then we manage the reliability of system and subsystems to meet the target reliability until completion of system development. In this paper, we research representative reliability allocation methods and introduce the suitable reliability allocation method followed by its application to the underwater guided weapon system. The purpose of this research is to review the proposed reliability allocation techniques and find an appropriate method for underwater weapon systems followed by the validation of its application.

건설장비 개발과정에서 신뢰성성장관리 적용방법에 대한 연구 (Application of Reliability Growth Management for Construction Equipment Development Process)

  • 소영국;전영록;류병진
    • 한국신뢰성학회지:신뢰성응용연구
    • /
    • v.13 no.3
    • /
    • pp.175-190
    • /
    • 2013
  • This study considers reliability growth management as the excellent method for construction equipment development with the effect on decreasing COPQ(Cost of Poor Quality Cost) of new products. MIL-HDBK-189A(1981) and RADC-TR-84-20(1984) standards provide a general concept of reliability growth management including to reliability growth test, models and FRACAS(Failure Reporting and Corrective Action System). There is no study how to apply reliability growth management to construction equipment(or machine) development. This paper propose the method to apply it to construction equipment development process from the reliability target setting for developing products to launching them at market. It is expecially showing how to set target reliability for new developing equipment and the development risk to reach the reliability target in detail.

Prediction of Safety Critical Software Operational Reliability from Test Reliability Using Testing Environment Factors

  • Jung, Hoan-Sung;Seong, Poong-Hyun
    • Nuclear Engineering and Technology
    • /
    • v.31 no.1
    • /
    • pp.49-57
    • /
    • 1999
  • It has been a critical issue to predict the safety critical software reliability in nuclear engineering area. For many years, many researches have focused on the quantification of software reliability and there have been many models developed to quantify software reliability. Most software reliability models estimate the reliability with the failure data collected during the test assuming that the test environments well represent the operation profile. User's interest is however on the operational reliability rather than on the test reliability. The experiences show that the operational reliability is higher than the test reliability. With the assumption that the difference in reliability results from the change of environment, from testing to operation, testing environment factors comprising the aging factor and the coverage factor are developed in this paper and used to predict the ultimate operational reliability with the failure data in testing phase. It is by incorporating test environments applied beyond the operational profile into testing environment factors. The application results show that the proposed method can estimate the operational reliability accurately.

  • PDF

신뢰도 예측 기반 신뢰도 성장 관리 : 감시체계 사례 (Reliability Prediction Based Reliability Growth Management : Case Study of Surveillance System)

  • 김상부;박우재;유재우;이자경;용화영
    • 품질경영학회지
    • /
    • v.47 no.1
    • /
    • pp.187-198
    • /
    • 2019
  • Purpose: In this study, a reliability prediction based reliability growth management is suggested especially for the early development phase of a system and the case study of surveillance system is given. Methods: The proposed reliability prediction based reliability growth management procedures consists of 7 Steps. In Step 1, the stages for reliability growth management are classified according to the major design changes. From Step 2 to Step 5, system reliability is predicted based on reliability structures and the predicted reliabilities of subsystems (Level 2) and modules (Level 3). At each stage, by comparing the predicted system reliability with that of the previous stage, the reliability growth of the system is checked in Step 6. In Step 7, when the predicted value of sustem reliability does not satisfy the reliability goal, some design alternatives are considered and suggested to improve the system reliability. Results: The proposed reliability prediction based reliability growth management can be an efficient alternative for managing reliability growth of a system in its early development phase. The case study shows that it is applicable to weapon system such as a surveillance system. Conclusion: In this study, the procedures for a reliability prediction based reliability growth management are proposed to satisfy the reliability goal of the system efficiently. And it is expected that the use of the proposed procedures would reduce, in the test and evaluation phase, the number of corrective actions and its cost as well.

신뢰성 국제 표준규격에 대한 연구 (The Study of International Reliability Standards Specifications)

  • 남경현
    • 한국신뢰성학회지:신뢰성응용연구
    • /
    • v.15 no.2
    • /
    • pp.101-107
    • /
    • 2015
  • In this paper, we review the domestic reliability standards and its global counterparts IEC/TC 56 international reliability standards. Recently private transfers of reliability certification control tower has established in Korea. Some check points to consider regarding the control tower transfer process to the non-government organization are suggested. Also the IEC/TC 56 and its relevant reliability standards are introduced. Understanding of the IEC/TC56 system will be helpful for the time of non-government organization control tower transfer in the reliability certificate specification

Reliability Equivalence of Two Non-identical Components

  • Mustafa, A.
    • International Journal of Reliability and Applications
    • /
    • v.9 no.1
    • /
    • pp.79-93
    • /
    • 2008
  • The aim of this work is to generalize reliability equivalence techniques to apply them to a system consists of two independent and non-identical components connected in series(parallel) system, that have constant failure rates. We shall improve the system by using one component only. We start by establishing two different types of reliability equivalence factors, the survival reliability equivalence (SRE) and mean reliability equivalence (MRE) factors. Our second studies, introducing some applications for our studies in airports and our life. Also, we introduced some numerical results.

  • PDF

Lloyds Register Asia Rail Systems Reliability Lifecycle Management

  • Jonathan, Bouchard
    • 한국철도학회:학술대회논문집
    • /
    • /
    • pp.27-43
    • /
    • 2003
  • Reliability Lifecycle from Concept to In-Service Operation and Maintenance. Reliability management must consider - SAFETY - SERVICE REQUIREMENTS. Reliability targets/objectives can be specified at feasibility stage. Reliability analysis to support design process. Reliability assessment to support reliability growth or contractual demonstration. Maintenance optimisation to improve reliability during lifetime of operation. Lessons learnt incorporated into next generation of trains.

  • PDF