• Title, Summary, Keyword: Reliability

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Development of Reliability Engineering in China

  • Zhang, Zengzhao;Pang, Fuli
    • Proceedings of the Korean Reliability Society Conference
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    • pp.3-19
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    • 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.

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

  • Kim, Gun Myung
    • Journal of Applied Reliability
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    • v.15 no.3
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    • pp.145-148
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    • 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.

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

  • Kim, SB;Park, WJ;You, JW;Lee, JK;Yong, HY
    • Journal of the Korean Society for Quality Management
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    • v.47 no.1
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    • pp.187-198
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    • 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.

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

  • Jung, Hoan-Sung;Seong, Poong-Hyun
    • Nuclear Engineering and Technology
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    • v.31 no.1
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    • pp.49-57
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    • 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.

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

  • So, Young-Kug;Jeon, Young-Rok;Ryu, Byeong-Jin
    • Journal of Applied Reliability
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    • v.13 no.3
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    • pp.175-190
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    • 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.

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

  • Kim, HeeWook;Lee, HakPyo;Heo, GilHwan;Oh, GeunTae;Kim, MyungSoo
    • Journal of Applied Reliability
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    • v.14 no.1
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    • pp.29-35
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    • 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.

Reliability Equivalence of Two Non-identical Components

  • Mustafa, A.
    • International Journal of Reliability and Applications
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    • v.9 no.1
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    • pp.79-93
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    • 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.

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

  • Nam, Kyung H.
    • Journal of Applied Reliability
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    • v.15 no.2
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    • pp.101-107
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    • 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

Lloyds Register Asia Rail Systems Reliability Lifecycle Management

  • Jonathan, Bouchard
    • Proceedings of the KSR Conference
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    • pp.27-43
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    • 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.

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Developing the Optimized Method of Reliability-Growth Target Setting for Complex and Repairable Products from Business View

  • So, Young-Kug;Jeon, Young-Rok;Ryu, Byeong-Jin
    • Journal of Applied Reliability
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    • v.15 no.4
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    • pp.248-255
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    • 2015
  • Purpose : The purpose of this research is to develop the optimized method and process in the reliability-growth target setting, especially for complex and repairable system (or products) such as vehicle and airplane, construction equipment. Method : A reliability-growth test plan specifies a scenario to achieve the planned reliability value (or reliability target). The major elements in test planning are reliability-growth starting time and reliability level at that time, reliability-growth rate and reliability-growth target. All of them except a reliability target can be referred to the previous development data and reference researches. The reliability target level is directly influencing to test period (or time) which is related to test and warranty cost together. There are a few researches about the reliability target setting method and but showing the limitations to consider the views of engineering, business and customer together. There is no research how to handle the target setting process in detail. Result : We develop the optimized method and systematic process in reliability target setting with considering such views. This research also establish the new concept as production capability which means company (or supplier) capability to product its products. Conclusion : In this research result, we apply the new method to a few projects and can set the reasonable test planning. The developing results is showing the good balance between the developing cost and warranty cost at market.