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2012 Proceedings Annual Reliability and Maintainability Symposium

23-26 Jan. 2012

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Displaying Results 1 - 25 of 107
  • [Front cover]

    Publication Year: 2012, Page(s): c1
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  • Author index

    Publication Year: 2012, Page(s):1 - 13
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  • Reliability of Wind Turbine components — Solder elements fatigue failure

    Publication Year: 2012, Page(s):1 - 7
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1396 KB) | HTML iconHTML

    The physics of failure for electrical components due to temperature loading is described. The main focus is on crack propagation in solder joints and damage accumulation models based on the Miner's rule. Two models are proposed that describe the initial accumulated plastic strain depending on the temperature mean and temperature range. Constant terms and model errors are estimated. The proposed me... View full abstract»

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  • A mission oriented accident model based on hybrid dynamic system

    Publication Year: 2012, Page(s):1 - 7
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (515 KB) | HTML iconHTML

    As a conceptualization of the characteristics of an accident, the accident model indicates the hazard factors in the systems and describes the process of system accidents. Therefore, accident models are the basis of system safety analysis and assessment. This paper presents a mission-oriented accident model to adopt the complex characteristics in the socio-technical system. Based on the principles... View full abstract»

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  • Optimizing R&M performance of a system using Monte Carlo Simulation

    Publication Year: 2012, Page(s):1 - 6
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (551 KB) | HTML iconHTML

    The R&M performance of a system is usually measured in terms of its Reliability (Ro), Availability (Ao), and Maintainability (MTTR and DMC) During the design phase of a system, several choices need to be made, such as number of redundant modules required to achieve a desired performance level (Reliability, Availability etc.), the system configuration or architecture, perf... View full abstract»

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  • NASA applications and lessons learned in reliability engineering

    Publication Year: 2012, Page(s):1 - 5
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4516 KB) | HTML iconHTML

    Since the Shuttle Challenger accident in 1986, communities across National Aeronautic and Space Administration (NASA) have been developing and extensively using quantitative reliability and risk assessment methods in their decision making process. This paper discusses several reliability engineering applications that NASA has used over the years to support the design, development, and operation of... View full abstract»

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  • Redundancy allocation for k-out-of-n: G systems with mixed spare types

    Publication Year: 2012, Page(s):1 - 6
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (491 KB) | HTML iconHTML

    This paper considers the redundancy allocation problem pertaining to k-out-of-n: G heterogeneous series-parallel systems. Different from existing approaches that consider either hot or cold standby redundancy for a parallel subsystem, our approach considers a mix of cold and hot standby redundancies within one subsystem to achieve a balance between fast recovery and power conservation in the optim... View full abstract»

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  • Monitoring product reliability and supply chain logistics in warranty data

    Publication Year: 2012, Page(s):1 - 6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1173 KB) | HTML iconHTML

    In this paper, we show how warranty data may be used to monitor the distributions of time spent by the product in the supply chain and its time to failure after reaching the consumer using simulated data. In our proposed modeling method, we estimate the parameters of the two distributions based on available warranty data that are collected periodically. Standard I-MR charts in statistical process ... View full abstract»

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  • A simple algorithm for sum of disjoint products

    Publication Year: 2012, Page(s):1 - 5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (453 KB) | HTML iconHTML

    The evaluation of network reliability and Fault Tree Analysis (FTA) is a NP-hard problem that is caused by sum-of-products. This paper presents a new algorithm for calculating system reliability by sum of disjoint products (SDP), based on Boolean algebra and generated from sum-of-products when minimal cut sets (MCS) are known. This algorithm could considerably reduce the number of disjoint (mutual... View full abstract»

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  • The safety analysis of flight landing based on Time Petri Net

    Publication Year: 2012, Page(s):1 - 5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (454 KB) | HTML iconHTML

    This paper mainly discusses the airport task flow safety problems induced by time factors, based on the Time Petri Net (TPN) method. We introduced the characteristics of an airport accident, and the method of TPN to analyze the flight landing task flow. The more detailed steps are shown as follows. Based on the characteristics of airport landing task flow, this paper introduced a plan task safety ... View full abstract»

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  • An improvement for HTA based on cognitive process

    Publication Year: 2012, Page(s):1 - 6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (689 KB) | HTML iconHTML

    The task analysis is the chief work of human factor, and assists analyst to deeper understand and describe the system and the human in it. The context of the task analysis is to describe human performance in a particular task or scenario and to break down tasks or scenarios into the required individual task steps based on the necessary interaction between the human and the machine. Cognitive task ... View full abstract»

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  • A strategic approach to technical and product data management

    Publication Year: 2012, Page(s):1 - 6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (475 KB) | HTML iconHTML

    The paper discusses Technical Data (TD) rights regulations and policies, and presents specific guidelines for the preparation of a Technical Data Strategy (TDS). Practical criteria for decision making regarding Technical Data options are identified and assessed through the conduct of a Business Case Analysis (BCA). While processes and methodologies have been put into place, lack of guidance and go... View full abstract»

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  • Limitations of explicit modeling of common cause failures within fault trees

    Publication Year: 2012, Page(s):1 - 6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (573 KB) | HTML iconHTML

    The significant impact that common cause failures can have on reliability and safety of a system comprising redundant components is widely acknowledged. These common cause failures can significantly endanger the benefits of the redundancy which is seen as the main principle upon which safety systems design is based. Thus, consideration of common cause failures is one of the most challenging and cr... View full abstract»

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  • Automatic and optimal allocation of safety integrity levels

    Publication Year: 2012, Page(s):1 - 6
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB) | HTML iconHTML

    Powertrain electrification of vehicles leads to a higher number of sensors, actuators and control functions resulting in increasing complexity. Due to the safety-criticality of the functionalities, safety standards must be considered during system development. The safety standard ISO 26262 defines discrete ASILs (Automotive Safety Integrity Levels) that must be identified and allocated to the comp... View full abstract»

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  • Pre-proposal assessment of reliability for spacecraft and instruments

    Publication Year: 2012, Page(s):1 - 5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (707 KB) | HTML iconHTML

    This paper primarily addresses the role of Reliability Engineering in the multidisciplinary process used by NASA's Goddard Space Flight Center in the Integrated Design Center and a description of the estimating tool that is used. This estimating tool may have expanded applicability in the proposal of new designs in many industries. Understanding key contributors to Mission Success or Failure is ne... View full abstract»

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  • Efficient analysis of warm standby systems using central limit theorem

    Publication Year: 2012, Page(s):1 - 6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (644 KB) | HTML iconHTML

    In a warm standby sparing system, the standby units have time-dependent failure behavior; they have different failure parameters or in general distributions before and after they are used to replace the on-line faulty units. Such time-dependent behavior makes the reliability analysis of warm standby system a challenging task. Existing approaches to analyzing the reliability of warm standby systems... View full abstract»

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  • Reliability engineering approach to achieve RCM for mechanical systems — 2012

    Publication Year: 2012, Page(s):1 - 7
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (567 KB) | HTML iconHTML

    The foundation for reliability-centered maintenance is the characterization of reliability failure models. Reliability is currently defined as the probability that a part will function without failure for designated mission durations under specified conditions of use. This paper proposes that reliability should be defined as the probability that a part will function without failure under risk char... View full abstract»

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  • Determining the availability on a system of systems network

    Publication Year: 2012, Page(s):1 - 5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB) | HTML iconHTML

    The Research Institute at the University of Alabama in Huntsville has developed a method of performing an availability analysis on a system of systems network. The goal of this process is to determine the overall availability for the entire network based up on the LRU (Line Replaceable Unit) and the design configuration of each of the systems. By examining the MTTR (Mean Time To Replace), MTBF (Me... View full abstract»

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  • Power law model, correct application in reliability growth do the cumulative times indeed always add up?

    Publication Year: 2012, Page(s):1 - 7
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (519 KB) | HTML iconHTML

    Reliability growth methodology is a valuable tool to measure product reliability improvement either through planned, dedicated testing or the gradual upgrade and improvement of the fielded product. The methodology is well thought of with appropriate process mathematical assumptions so that when applied, it provides appropriate and justifiable information and tracking of reliability improvement. Th... View full abstract»

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  • Integrated importance based maintenance decision making

    Publication Year: 2012, Page(s):1 - 7
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (443 KB) | HTML iconHTML

    This paper proposed an integrated importance based maintenance decision making method to provide reasonable maintenance schemes for decision makers. First, the concept of integrated importance measure (IIM) is introduced and its physical meaning and characteristics in maintenance are discussed. Then, a new maintenance decision making model (MDM) is put forward by extending the influence diagram. T... View full abstract»

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  • Integrated importance analysis with Markov Bayesian networks

    Publication Year: 2012, Page(s):1 - 7
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (453 KB) | HTML iconHTML

    This paper proposed a Markov Bayesian network (MBN) model to facilitate the calculation of integrated importance measure (IIM) for component state in dynamic multi-state systems. First, the concept of IIM is introduced and its computation formula is decomposed into 3 parts to simplify the analysis process. Then, the MBN is proposed on the basis of Bayesian network and state transition diagram to d... View full abstract»

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  • Failure assessment and HALT test of electrical converters

    Publication Year: 2012, Page(s):1 - 6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (495 KB) | HTML iconHTML

    Reliability improvement of power electronic products is the key action to achieve sustainable forms of production and use of electric energy. The availability of electrical converters in applications like power transmission, conversion, and usage in motors is crucial for sustainability. To address reliability and availability, risk assessment strategies are becoming increasingly applied in power e... View full abstract»

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  • Outage performance improvement by Preventive Maintenance optimization

    Publication Year: 2012, Page(s):1 - 4
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB) | HTML iconHTML

    Shutting down a power plant for any reason is a costly process. Loss of production revenues from one unit can exceed millions of dollars per day. It is therefore good practice to keep outages as short and efficient as possible. A major component of planned outages is Preventive Maintenance (PM). It is important that PM be applied only where needed. Unnecessary PM is costly, not only in terms of la... View full abstract»

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  • Risk-informed Preventive Maintenance optimization

    Publication Year: 2012, Page(s):1 - 5
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    The risk management group at the South Texas Project Electric Generating Station (STPEGS) has successfully developed a Preventive Maintenance (PM) optimization application based on a new mathematical model developed in collaboration with the University of Texas at Austin. This model uses historical maintenance data from the STPEGS work management database. Robust statistical analysis, coupled with... View full abstract»

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  • Risk comparison of crew launch vehicle concepts

    Publication Year: 2012, Page(s):1 - 4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (502 KB) | HTML iconHTML

    NASA is embarking on a new era of human spaceflight, one in which commercial service providers will sell astronaut transportation services to NASA. Thus NASA will have limited insight into the design and manufacturing processes of space transportation vehicles. In this new paradigm, setting appropriate safety requirements and goals, for the service providers to meet, and a standard process for eva... View full abstract»

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