Lifetime costs associated with an airframe from design through manufacture and operation to disposal are difficult to quantify. There is no doubt that maintenance and unplanned failures contribute significantly to the expense but it remains difficult to attach numerical figures to these costs. While the perceived wisdom points towards structural health monitoring and prognostics as a valuable area of research, it is difficult to justify the resources contributed to this field, and more importantly the priority assigned to each facet of the research, without a comprehensive study. This is a daunting undertaking but results from related industries have sometimes proved counterintuitive and such a report could help direct efforts towards the most productive endeavours. Existing reliability studies of rotorcraft parts have provided meaningful assessments of the factors leading to component failure but, historically, the relatively small data sets available for analysis have hampered definitive conclusions. The current trends in HUMS data collection have paved the way for more detailed studies and this opportunity should be capitalised upon through the deployment of extensive sensor networks. In addition to the direct benefits of condition monitoring, the data will allow identification of critical operating and failure regimes, facilitating better focused development efforts. In particular, a largely neglected but crucial area for monitoring is on the rotating parts of rotorcraft. The unique problems presented by such deployments make them prime candidates for wireless implementations. The long life-cycles of these structures make the prospect of easy retro-fitting enticing. Electrical isolation makes certification easier, and the wireless approach offers the prospect of simplified installation on the rotating assemblies in addition to that of remote data acquisition at ground stations. Furthermore, the efficiency limitations of wireless power delivery are not a significant concern in such environments, where power at the source is plentiful. The installation of large sensor arrays and empirical studies of failure and fatigue modes will be aided by the incorporation of advanced sensor techniques, including active sensing; technologies that are ready for implementation but currently limited by power availability. These studies also form a natural precursor to intelligent prognostic implementations, where again the state of the art is in advance of current sensor deployments. For these reasons, and because of the shortcomings of current energy scavenging methods, the critical path in the development of SHM technology points towards the implementation of wireless power delivery in rotorcraft applications. The technologies presented herein provide many avenues for research, and while several advanced methods show significant promise (for example, nano-scale rectennae), the technologies which have produced the best results to date and which should be available for immediate implementation are the inductive and RF radiative methods. Further feasibility studies on the specific needs of rotorcraft applications are recommended to determine the most appropriate of these two options and to optimise the choice of equipment from that presented here.


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    Titel :

    Towards a wireless powering and interrogation strategy for rotorcraft health monitoring


    Beteiligte:
    Bois, J.L. du (Autor:in) / Lieven, N.A.J. (Autor:in) / Todd, M. (Autor:in)


    Erscheinungsdatum :

    2009


    Format / Umfang :

    14 Seiten, 52 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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