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In today's competitive market place the need to reduce cost and increase speed in development require exploring a different approach than the traditional waterfall method of hardware development. The Waterfall method consists of a series of stages that are completed sequentially, once a stage has been completed, developers can't go back to the previous stage — not without scratching the project and...
This paper presents the results of a survey of Reliability Engineers relating their impact on their company or organization. The survey was performed at the June 2016 North American Applied Reliability Symposium and relates to a presentation of “10 Questions every Reliability Engineer should answer Yes, and Why”. There were 49 responses to the survey out of an audience of about 70. The most surprising...
In sudden-death life testing, a group of m specimens is put on a test machine together and run until the d-th failure. The total cost of such a test is a function of m, of the expected test length, and the number G of such groups tested. For a Weibull model, new results here optimize m and G to minimize the variance of the estimate of a specified low fractile subject to a specified total test cost...
Production part approval process (PPAP) is originally designed and used in the automotive industry to assure supplier parts integrity and manufacturing processes maturity. As an effective risk reduction process prior to product/service release, PPAP has been widely used in many other industries including aerospace industry. In this research, the existing method of assessing part risks for PPAP implementation...
While working on New Product Developments (NPD), it is a common practice to make use of stress strength interference model to estimate the reliability of a product during the early design stage. However, it is very important to take into account the possible degradation in the strength of the material as it is put into operation. This paper is an attempt to make use of test data available for a specific...
Hearing solutions are not only relevant for human interaction but also for enabling the benefit of communication with other devices featuring audio capabilities such as smartphones and TV. Bluetooth is a widely spread wireless connection protocol that is called upon to meet such demands. It operates in the internationally allocated, unlicensed Industrial, Scientific, & Medical (ISM) frequency...
Clients often associate Root Cause Analysis (RCA) with troubleshooting equipment failures. But it encompasses more than simple troubleshooting or identifying component failure causal factors. RCA investigators systematically drill deep into an organization's standards, policies and administrative controls to determine how those elements failed to prevent or eliminate causal factors associated with...
Today's budgetary concerns represent constraints that limit the overall budget of many programs and, subsequently, also the reliability program budget. Because of this, often times product testing may be significantly scaled down or not performed at all. This results in limited to no test information to support a reliability prediction for a development system, including single-shot devices. This...
A failed component / system brought back to its functioning state after repair exhibits different failure intensity than before its failure. This happens because the system in which the component is functioning experiences deterioration with age or the component / system is a repaired one which is aged compared to a new component / system. These factors affect the failure intensity of the component...
For products with high reliability and long life, a failure is usually defined in terms of a performance characteristic exceeding a specified threshold. Numerous failure time and reliability information can be derived in the degradation process. As a constant-stress accelerated degradation testing (CSADT) is very time-consuming and costly, research on the NAND solid state disks' (NAND SSD) statistical...
Warranty prediction is a very important task in reliability engineering. It needs to estimate the expected number of failures in any given time period during the length of the warranty contract. Several commercial software packages have been already implemented and used in the industry, including Minitab and Weibull++. The time to failure is usually selected to be a Weibull distribution and no technology...
Candidate test plans with 3 stress levels (L, M, H) were identified using the probability of zero failures at one or more stress levels Pr{ZFP1} as a target parameter. For a given sample size n, the allocations nL and nM are input variables. The optimization involves finding a minimum for the lower stress level, on the premise that plans with wider spread of the stress levels have smaller error of...
Quantitative Risk Assessment (QRA) is an effective element of the Safety Risk Management process that augments qualitative methods used in the past. QRA is based on Life Data Analysis [1] and can accurately predict future risk by analyzing the risk without corrective action (uncorrected risk), and then analyzing the risk with specific mitigating actions implemented (corrected risk). Before 2013, there...
Mega-constellations are one of the emerging challenges in the satellite communication business. Several concepts of large networks of inexpensive low Earth orbiting satellites have been proposed in response to the ever increasing demand for low cost broadband capacity, particularly in developing countries where there is limited access to terrestrial networks. In this context, mega-constellation satellite...
All modern commercial aircraft are designed with a high degree of redundancy and with an emphasis on reliability and maintainability, having undergone a detailed MSG-3 (Maintenance Steering Group) type analysis and are delivered by the manufacturer with an evolving package of ongoing maintenance requirements to keep the aircraft serviceable and airworthy. Even though the airframe and engines are amongst...
To prevent accidents, it is very important to learn why and how past accidents occurred and escalated. The information of accidents is mostly recorded in natural language texts, which is not convenient to analyze the flow of events in the accidents. This paper proposes a method to recognize typical flow of events in a large set of text reports. By focusing two adjacent sentences, our system succeeded...
This paper presents the successful application of a MIL-STD-1629A based FMEA methodology to a complex, software-centric, Service Oriented Architecture (SOA) system that includes a large variety of distributed hardware/operating platforms. It provides a brief background of the problem, including a discussion of the challenges presented by the system, such as functional decomposition and interface analysis,...
In this paper, an extended CREAM is used to take neutral effects of CPCs into account to infer the importance and necessity of them for HEP calculations in marine engineering along with complex man-machine system. In the traditional method, the sum of the numbers of positive effects and negative effects decides the control modes and ignores the influence of neutral effects which is the majority of...
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