A review of aircraft auxiliary power unit faults, diagnostics and acoustic measurem

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dc.contributor.authorAhmed, Umair
dc.contributor.authorAli, Fakhre
dc.contributor.authorJennions, Ian
dc.date.accessioned2021-05-11T15:55:21Z
dc.date.available2021-05-11T15:55:21Z
dc.date.issued2021-04-30
dc.description.abstractThe Auxiliary Power Unit (APU) is an integral part of an aircraft, providing electrical and pneumatic power to various on-board sub-systems. APU failure results in delay or cancellation of a flight, accompanied by the imposition of hefty fines from the regional authorities. Such inadvertent situations can be avoided by continuously monitoring the health of the system and reporting any incipient fault to the MRO (Maintenance Repair and Overhaul) organization. Generally, enablers for such health monitoring techniques are embedded during a product's design. However, a situation may arise where only the critical components are regularly monitored, and their status presented to the operator. In such cases, efforts can be made during service to incorporate additional health monitoring features using the already installed sensing mechanisms supplemented by maintenance data or by instrumenting the system with appropriate sensors. Due to the inherently critical nature of aircraft systems, it is necessary that instrumentation does not interfere with a system's performance and does not pose any safety concerns. One such method is to install non-intrusive vibroacoustic sensors such that the system integrity is maintained while maximizing system fault diagnostic knowledge. To start such an approach, an in-depth literature survey is necessary as this has not been previously reported in a consolidated manner. Therefore, this paper concentrates on auxiliary power units, their failure modes, maintenance strategies, fault diagnostic methodologies, and their acoustic signature. The recent trend in APU design and requirements, and the need for innovative fault diagnostics techniques and acoustic measurements for future aircraft, have also been summarized. Finally, the paper will highlight the shortcomings found during the survey, the challenges, and prospects, of utilizing sound as a source of diagnostics for aircraft auxiliary power units.en_UK
dc.identifier.citationAhmed U, Ali F, Jennions I. (2021) A review of aircraft auxiliary power unit faults, diagnostics and acoustic measurements. Progress in Aerospace Sciences, Volume 124, Jul 2021, Article number 100721en_UK
dc.identifier.issn0376-0421
dc.identifier.urihttps://doi.org/10.1016/j.paerosci.2021.100721
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/16666
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectmachine learningen_UK
dc.subjectsound pressure levelen_UK
dc.subjectsound poweren_UK
dc.subjectacousticsen_UK
dc.subjectairborne sounden_UK
dc.subjectcore noiseen_UK
dc.subjectsignal processingen_UK
dc.subjectcondition-based maintenance,en_UK
dc.subjectvibrationen_UK
dc.subjectgas turbinesen_UK
dc.titleA review of aircraft auxiliary power unit faults, diagnostics and acoustic measuremen_UK
dc.typeArticleen_UK

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