Reducing the "No Fault Found" problem: Contributions from expert-system methods

Beniaminy, Israel; Joseph, D.

doi:10.1109/aero.2002.1036138

Cited by 13 publications

(9 citation statements)

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“…[6,15,21,22,23,24]. Most methods are based on the total probability theorem, such as Decomposition method and Factoring Algorithm, in which a keystone components ( ) should be defined and then the reliability of the system can be expressed as: (1) The most common approach that is widely used for determining reliability of a complex system is based on the idea of a Tie-set (Path-set) or a Cut-set. A tie-set is a complete path through the RBD and a cut set is a set of blocks (components) which interrupts all connections between the input and the output ends when removed from the RBD [6,19].…”

Section: Complex Systems Reliability Assessme T Methodsmentioning

confidence: 99%

“…But in the process of analyzing complex system failures, there are high proportion of No Defect Found (NDF), also known as No Trouble Found (NTF) and No Fault Found (NFF), which can be caused by missing interface or interaction failure analysis [1,2]. In addition, most existing reliability analysis methods considered the physical component failure as causes of system failure and have not well considered the interface (interaction) failure as a reason of system failure.…”

Section: Troductiomentioning

confidence: 99%

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System reliability assessment incorporating interface and function failure

Mobin

2015

2015 Annual Reliability and Maintainability Symposium (RAMS)

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This paper proposes a new perspective and method to model system reliability by analyzing a system's functional and interface/interaction failure. System failure is evaluated based on the functions that a system is designed to deliver. Functional failures can be attributed to physical componentlevel failure as well as the interface failure. A new system reliability modeling framework is developed to quantify the reliability performance through system function and interface analysis. Interfaces failure and possible multiple functions failure can then be integrated into the traditional fault tree and reliability block diagram reliability analysis. The research is motivated by the high proportion of Non-Defect Found or "NDF" in failure analysis of complex engineering systems, which has been attributed to the lack of interface failure analyses. The proposed function and interface analysis based system reliability method is demonstrated through assessing and modeling the reliability of a power assembly system in a diesel-electric engine.

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Section: Complex Systems Reliability Assessme T Methodsmentioning

confidence: 99%

Section: Troductiomentioning

confidence: 99%

System reliability assessment incorporating interface and function failure

Mobin

2015

2015 Annual Reliability and Maintainability Symposium (RAMS)

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“…It is clear that a great deal of NFF occur in avionics, electrical and electro-mechanical systems, however research discussions have also revealed that software (including Built-In-Tests (BIT)) is also a key contributor to the problem [5,24,25,26] [27] for railways, or the IEC 60812 [28] is often referred to when carrying out Failure Mode and Effects Analysis (FMEA) 4 for software based systems), that can be used to validate software operation and meet specific requirements. However, since standards and guidelines are prepared to be generic, they only briefly consider the handling of any malfunctions caused by software faults and their effects in FMEA [29].…”

Section: Software Systemsmentioning

confidence: 99%

“…4. On-site or practical feedback: To close the loop with reliability, new system failure modes are often discovered adding to the troubleshooting difficulties [26], and acts as a source of feedback to design engineering for reliability improvements.…”

Section: Troubleshooting: In Theory If Fault Isolation Manualsmentioning

confidence: 99%

No Fault Found events in maintenance engineering Part 2: Root causes, technical developments and future research

Khan

Phillips

Hockley

et al. 2014

Reliability Engineering & System Safety

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This is the second half of a two paper series cover aspects of the NFF phenomenon, which is highly challenging and is becoming even more important due to increasing complexity and criticality of technical systems. Part 1 introduced the fundamental concept of unknown failures from an organizational, behavioral and cultural stand point. It also reported an industrial outlook to the problem, recent procedural standards, whilst discussing the financial implications and safety concerns. In this issue, the authors examine the technical aspects, reviewing the common causes of NFF failures in electronic, software and mechanical systems. This is followed by a survey on technological techniques actively being used to reduce the consequence of such instances. After discussing improvements in testability, the article identifies gaps in literature and points out the core areas that should be focused in the future. Special attention is paid to the recent trends on knowledge sharing and troubleshooting tools; with potential research on technical diagnosis being enumerated.

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“…No-fault-found (NFF) has financial impact on all industries, but the transport and aerospace sectors suffer more than others [1]. The American Trans Air member airlines spend $100 million annually on NFF in terms of thousands of flight delays and cancelations [2] and the cost of aircraft troubleshooting and recovery.…”

mentioning

confidence: 99%

A Novel Intermittent Fault Detection Algorithm and Health Monitoring for Electronic Interconnections

Syed

Perinpanayagam

Samie

et al. 2016

IEEE Trans. Compon., Packag. Manufact. Technol.

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There are various occurrences and root causes that result in no-fault-found (NFF) events but an intermittent fault (IF) is the most frustrating. This paper describes the challenging and most important area of an IF detection and health monitoring that focuses toward NFF situation in electronics interconnections. The experimental work focuses on mechanically-induced intermittent conditions in connectors. This paper illustrates a test regime, which can be used to repeatedly reproduce intermittence in electronic connectors, while subjected to vibration. A novel algorithm is used to detect an IF in interconnection. It sends a sine wave and decodes the received signal for intermittent information from the channel. This algorithm has been simulated to capture an IF signature using PSpice (electronic circuit simulation software). A simulated circuit is implemented for practical verification. However, measurements are presented using an oscilloscope. The results of this experiment provide an insight into the limitations of existing test equipment and requirements for future IF detection techniques. Aside from scheduled maintenance, this paper considers the possibility for in-service intermittent detection to be built into future systems, i.e., can IFs be captured without external test gear? Index Terms-Fault diagnosis, fault detection, NFF, and intermittent fault detection. I. INTRODUCTION M OST DEVICES and systems contain embedded electronics modules for monitoring, control, and to enhance the functionality of cars, trains, ships, and aeroplanes. The shrinking size and complexity of electronic circuits, with added redundancies, have led to difficulties in the maintenance of these systems. This becomes a challenge when faults are intermittent in nature. Intermittent faults (IFs) are a growing problem in electronics interconnection systems, especially for aircraft, satellites, and other vehicle industries and are safety critical to unmanned/autonomous connected vehicles. Interconnections have significantly increased in modern systems and these are prone to high stress of temperature, humidity, power fluctuation, electromagnetic interference, critical timing, aging, and vibration.

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Reducing the "No Fault Found" problem: Contributions from expert-system methods

Cited by 13 publications

References 0 publications

System reliability assessment incorporating interface and function failure

System reliability assessment incorporating interface and function failure

No Fault Found events in maintenance engineering Part 2: Root causes, technical developments and future research

A Novel Intermittent Fault Detection Algorithm and Health Monitoring for Electronic Interconnections

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