A method of combining intermittent arc fault technologies

Parkey, Charna R.; Hughes, Craig; Caulfield, Mike; Masquelier, Michael P.

doi:10.1109/autest.2012.6334571

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…In civil and military aerospace, recording and maintaining TDR data archives, for even a limited number of circuit's, may prove to be enormous and costly [68]. Another technique, called spread-spectrum time-domain reflectometry (SSTDR) is commercially being used to identify faults in electrical wires by observing reflected spread spectrum signals Parkey et al [69].…”

Section: Test Equipmentmentioning

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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Section: Test Equipmentmentioning

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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show abstract

“…For example, various reflectometers have been widely used in the cable path detection, and have a very good effect on the intermittent connection fault. Characteristics and principles of various reflectometers and an inspection tester-wire integrity tester (WIT) based on various reflectometers are introduced in [18]. The application of the reflectometer in intermittent fault detection of the flight control system for F-18 fighter is introduced in [19].…”

Section: Detection Methodsmentioning

confidence: 99%

A Survey on Intermittent Fault Diagnosis for Electronic System

Wu¹,

Sheng²,

Qian³

et al. 2017

Proceedings of the 2nd International Conference on Computer Engineering, Information Science &Amp; Application Technology (ICCI

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Abstract. The intermittent fault of electronic system is often misdiagnosed as a permanent fault, resulting in problems such as unnecessary repeated downtime, excessive repair and a large loss of spare parts, and affecting equipment readiness. Starting from the overall development of intermittent fault for electronic system to tease out the research direction, this paper focuses on the research of intermittent fault for electronic system from four aspects: the failure mode, cause and mechanism analysis, modeling method, detection method and diagnosis / prediction method, and points out the shortcomings of the current research on intermittent fault of electronic system.

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“…More difficult to detect are intermittent wiring failures that may arise only under dynamic, flight-related stresses that are not reproducible under static ground conditions. Astronics Test Systems introduced a commercial test instrument in 2011, the Wire Integrity Tester (WIT) [4], specifically targeting identification and location of intermittent wiring faults. The WIT incorporated two advanced technologies, spread-spectrum-time-domain-reflectometry (SSTDR) and low-energy-high-voltage (LEHV) reflectometry, demonstrated to be effective in identification and location of intermittent faults.…”

Section: Introductionmentioning

confidence: 99%

Distance-to-fault estimation for low-energy, high-voltage fault location in aircraft wiring

Costello¹,

Hughes²

2019

2019 Ieee Autotestcon

Self Cite

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A distance-to-fault (DTF) measurement method for intermittent faults in aging aircraft wiring is described. Multiple technologies are available for identifying and locating wiring faults in aircraft wiring harnesses. One particularly difficult type of fault to identify and locate is intermittent faults that occur only under flight loads, where vibration and airframe flexure can locally stress wiring. Such dynamic failures are less likely to measure direct faults on the ground under static maintenance conditions. Low-Energy High-Voltage (LEHV) failure analysis systems like Astronics' Wire Fault Tester (WIFT) apply a highvoltage, limited energy test stimulus to aircraft wiring. The high voltage will induce a momentary arc-to-ground event at the site of insulation damage, then the resulting voltage waveform at the test interface may be analyzed to locate the fault. Under the conditions of such a momentary fault, the spark arcing to ground launches a waveform away from the arc toward the instrumentation interface. The propagating wave-front reflects between the arc location and the instrument multiple times before dissipating completely, resulting in a waveform, as measured at the instrument, similar to the step-response of a transmission line with an open load. Conventionally, "bounce diagrams" are used to analyze this type of dynamic behavior, such as in high-speed digital circuits. Certain features of the waveform give indication of the fault location, however any variation in impedance along the length of the wiring section under test produces small-scale local reflections, resulting in waveform distortion that hampers identification of the fault location. A waveform analysis method has been developed that is less sensitive to impedance variations, and accurately estimates distance-to-fault. Repeatable accuracy of +/-10% DTF estimation over actual DTF lengths ranging from 5 to 95 ft has been demonstrated with conventional controlledimpedance wiring types, and with discrete, uncontrolled impedance conductors. The core of the analysis consists of a correlation-based method that estimates the periodicity of the waveform as a starting point for local feature identification.

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A method of combining intermittent arc fault technologies

Cited by 5 publications

References 11 publications

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

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

A Survey on Intermittent Fault Diagnosis for Electronic System

Distance-to-fault estimation for low-energy, high-voltage fault location in aircraft wiring

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