The main objective of this article was to address the feasibility of integrating nanotube reinforcement in fibre-reinforced plastics in order to mitigate the effect of buffeting in aerodynamic control surfaces. The rudder of a representative business jet aircraft was considered as case study. Stiffening the tail assembly with additional structural element may provide an easy fix, but the associated weight penalty is considerable. Modifications of the aerodynamic layout aiming at avoiding vortex impinging the tail would require substantial configuration changes which are beyond the scope and rationale of this work. A survey of the existing active vibration suppression approaches, i.e. smart materials and actuators, pointed out that such solutions suffer from additional complexity, significant weight penalties and issues in terms of long-term reliability. Passive vibration suppression via the integration of high damping material such as constrained layers emerged as an effective approach to mitigate buffeting, albeit the resulting vibration alleviation is strongly dependent on the temperature. The strategy adopted for integrating passive damping in the rudder structure was based upon identifying the high strain energy density regions in order to minimize the associated weight penalty. This was done for both commercially available constrained layer materials and for a CFRP (carbon-fiber-reinforced plastic) with added MWNT (multi-walled nanotube) nanofiller. The fraction of MWNT considered was 1.5 wt% and the nanofillers ware assumed to be randomly dispersed in the composite epoxy matrix. Such assumptions appear reasonable in terms of the current technology. MWNT are also relatively cheap, so the impact of the proposed damping enhancement solution on cost will be limited. It was demonstrated that the passive damping via MWNT inclusions provided a substantial increase of the rudder dynamic stiffness with an almost negligible weight penalty. This result is mainly dependent on the fact that MWNT offer stable damping properties with respect to temperature, while viscoelastic constrained layers are effective only at room temperature. The limitations of such approach are mainly related to the actual availability of multi-scale engineered composites, where reinforcement is applied both at the nanoscale and microscale.


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    Titel :

    Buffeting mitigation using carbon nanotube composites: A feasibility study


    Weitere Titelangaben:

    Abschwächung von Flatterschwingungen mit Verbundwerkstoffen aus Kohlenstoff-Nanoröhrchen: Eine Machbarkeitsstudie


    Beteiligte:
    Yuan, Jie (Autor:in) / Allegri, Giuliano (Autor:in) / Scarpa, Fabrizio (Autor:in)


    Erscheinungsdatum :

    2013


    Format / Umfang :

    16 Seiten, 11 Bilder, 9 Tabellen, 44 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch





    Buffeting mitigation using carbon nanotube composites: a feasibility study

    Yuan, Jie / Allegri, Giuliano / Scarpa, Fabrizio | SAGE Publications | 2013


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