2008 Annual Reliability and Maintainability Symposium最新文献_第7页

Telcordia Reliability Prediction Procedure: Upper confidence levels Telcordia可靠性预测程序:上置信度

2008 Annual Reliability and Maintainability Symposium Pub Date : 2008-01-28 DOI: 10.1109/RAMS.2008.4925838

J. Bennett

{"title":"Telcordia Reliability Prediction Procedure: Upper confidence levels","authors":"J. Bennett","doi":"10.1109/RAMS.2008.4925838","DOIUrl":"https://doi.org/10.1109/RAMS.2008.4925838","url":null,"abstract":"SR-332, reliability prediction procedure for electronic equipment, is a module of the Telcordia family of requirements (FR) known as FR-796, reliability and quality generic requirements (RQGR). The purpose of the Telcordia reliability prediction procedure (RPP) is to document a standard method for predicting device and unit hardware reliability as well as serial system hardware reliability. A prediction of reliability is an important element in the process of selecting equipment for use by telecommunications service providers and other buyers of electronic equipment. As used in the RPP, reliability is a measure of the frequency of equipment failures as a function of time. In 2006, the RPP was revised for the first time since 2001. Among many changes, the new issue 2 introduced a significant enhancement to the procedure: the ability to estimate arbitrary upper confidence levels (UCLs). This paper will provide a brief overview of the RPP, review modifications to the procedure in Issue 2, and in particular describe the motivation for defining these new UCL techniques, the addition of generic standard deviation values, and the methodologies for calculating upper confidence levels. In conclusion, the techniques introduced in issue 2 allow for the calculation of failure rate UCLs at any level of confidence, not just 90%. A side benefit is that the new techniques also allow for the estimation of the mean failure rate of electronic equipment.","PeriodicalId":143940,"journal":{"name":"2008 Annual Reliability and Maintainability Symposium","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121416543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

An age-adjusted comparison of field failure data for repairable systems 可修系统现场故障数据的年龄调整比较

2008 Annual Reliability and Maintainability Symposium Pub Date : 2008-01-28 DOI: 10.1109/RAMS.2008.4925769

T. Halim, L. Tang

{"title":"An age-adjusted comparison of field failure data for repairable systems","authors":"T. Halim, L. Tang","doi":"10.1109/RAMS.2008.4925769","DOIUrl":"https://doi.org/10.1109/RAMS.2008.4925769","url":null,"abstract":"The conventional calendar-based mean cumulative function (MCF) plot is useful in monitoring the field reliability of a population of repairable systems deployed in a large quantity. It is simple and easily understood by management. However, it is age-confounded when the system population is heterogeneous with age. Assuming that the systems follow the well-known ldquoBathtubrdquo behavior, the population which consists of a higher proportion of aged systems will perform badly on the MCF plot compared to another population made up of mainly newer systems. Hence, direct comparisons between the two populations may not be fair. This paper illustrates a few simple steps that aid in mitigating such age heterogeneity issue prior to plotting the MCF. The age-adjusted MCF allows a fairer comparison of maintenance performance between the populations. The applicability of the proposed approach is demonstrated using actual field failure data. The case study shows that if differences in system age compositions are not accounted for, different conclusions could be drawn which could be detrimental to the maintenance personnel morale. Worse still, precious maintenance resources might be channeled to the wrong location. Other than age, the proposed approach can be easily extended to adjust for other system attributes.","PeriodicalId":143940,"journal":{"name":"2008 Annual Reliability and Maintainability Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128744433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Probabilistic common-cause failures analysis 概率共因故障分析

2008 Annual Reliability and Maintainability Symposium Pub Date : 2008-01-28 DOI: 10.1109/RAMS.2008.4925821

L. Xing, Wendai Wang

引用次数: 25

Reliability analysis of phased-mission systems using Bayesian networks 基于贝叶斯网络的分阶段任务系统可靠性分析

2008 Annual Reliability and Maintainability Symposium Pub Date : 2008-01-28 DOI: 10.1109/RAMS.2008.4925763

Dong Liu, Chunyuan Zhang, Weiyan Xing, Rui Li

引用次数: 7

A unified model for evaluating the safety integrity level of safety instrumented systems 安全仪表系统安全完整性水平评价的统一模型

2008 Annual Reliability and Maintainability Symposium Pub Date : 2008-01-28 DOI: 10.1109/RAMS.2008.4925784

J. Bukowski

引用次数: 3

A systems reliability approach to decision making in autonomous multi-platform systems operating a phased mission 自主多平台系统分阶段任务决策的系统可靠性方法

2008 Annual Reliability and Maintainability Symposium Pub Date : 2008-01-28 DOI: 10.1109/RAMS.2008.4925761

J. Andrews, D. Prescott, R. Remenyte-Prescott

引用次数: 19

An approach for estimating the reliability of transmission oils 一种估计传动油可靠性的方法

2008 Annual Reliability and Maintainability Symposium Pub Date : 2008-01-28 DOI: 10.1109/RAMS.2008.4925807

C. Maisch, B. Bertsche, B. Hohn, H. Otto

{"title":"An approach for estimating the reliability of transmission oils","authors":"C. Maisch, B. Bertsche, B. Hohn, H. Otto","doi":"10.1109/RAMS.2008.4925807","DOIUrl":"https://doi.org/10.1109/RAMS.2008.4925807","url":null,"abstract":"This paper deals with an approach for estimating the reliability of transmission oils. Forecasting oil degradation, especially oil oxidation allows to adjust the right oil change intervals in order to save costs and expand the transmission's lifetime. A brief overview about the machine component transmission oil imparts fundamental knowledge. Afterwards definitions of oil failures and combining them to an oil failure system are explained. The oil lifetime line describes the relationship between possible oil temperature and oil lifetime. Such a line is the keystone in order to describe the oil's failure behavior caused by oil oxidation. That's why two approaches are presented to derive an oil lifetime line. Both approaches use a certain oil failure criteria explained in the paper. The first approach is based on the pitting damage accumulation hypothesis. This hypothesis is expanded with the effect of oil degradation what enables to derive an oil lifetime line out of the results of a back-to-back spur gear rig test. Second a General Log Linear Model is used with available data to estimate the gears pitting lifetime depending on oil degradation. With the defined oil failure criteria it was possible to derive an oil lifetime line for mineral oil based fluids. Further work will include the estimation of an oil lifetime line with a probability and confidence intervals. Synthetic oil based fluids need to be investigated more intensive in order to create a suitable oil lifetime line for such fluids.","PeriodicalId":143940,"journal":{"name":"2008 Annual Reliability and Maintainability Symposium","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131434276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A methodology for managing reliability growth during operational mission profile testing 一种在作战任务剖面测试过程中管理可靠性增长的方法

2008 Annual Reliability and Maintainability Symposium Pub Date : 2008-01-28 DOI: 10.1109/RAMS.2008.4925768

L. H. Crow

{"title":"A methodology for managing reliability growth during operational mission profile testing","authors":"L. H. Crow","doi":"10.1109/RAMS.2008.4925768","DOIUrl":"https://doi.org/10.1109/RAMS.2008.4925768","url":null,"abstract":"It is common practice for systems to be subjective to operational testing during their development program. The objective of this testing is to evaluate the performance, including reliability, of the system under conditions that represent actual use conditions. Because of expense, resources, schedule, and other considerations, these operational tests rarely represent exactly the actual use conditions. Rather, stated mission profile conditions are specific for the operational testing. These mission profiles conditions are typically general statements that guide the testing on an average basis during the testing. Because of practical constraints the elements that make up the mission profile conditions are typically tested under varying schedules with the intent that on average the mission profile conditions are met. It is also common practice that reliability corrective actions are incorporated into the system during this type of testing. That is, the test is often an operational mission profile reliability growth test. Under these conditions, we usually have a lack of structure for managing the elements that make up the mission profiles, which makes it very difficult to have an agreed-on methodology for estimating the system's reliability. This is especially true if reliability growth is occurring. Many systems fail operational testing because key assessments parameters can not be made in a straightforward clear manner so that management can take timely and appropriate action. This paper addresses this issue and presents a methodology currently being applied on major Department of Defense programs for operational reliability growth testing.","PeriodicalId":143940,"journal":{"name":"2008 Annual Reliability and Maintainability Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129682222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Optical monitoring system availability optimization via semi-Markov processes and genetic algorithms 基于半马尔可夫过程和遗传算法的光学监测系统可用性优化

2008 Annual Reliability and Maintainability Symposium Pub Date : 2008-01-28 DOI: 10.1109/RAMS.2008.4925810

M. das Chagas Moura, P. Firmino, E. Droguett, C.M. Jacinto

引用次数: 2

Identifying factors influencing reliability of professional systems 确定影响专业系统可靠性的因素

2008 Annual Reliability and Maintainability Symposium Pub Date : 2008-01-28 DOI: 10.1109/RAMS.2008.4925771

A. Balasubramanian, K. Kevrekidis, P. Sonnemans, M. Newby

引用次数: 6