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Worst Case Gust Prediction of Highly Flexible Wings

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Original languageEnglish
Title of host publication58th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
Publisher or commissioning bodyAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
Number of pages17
ISBN (Electronic)9781624104534
DatePublished - 9 Jan 2017
EventAIAA SciTech Forum 2017: 58th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference - Texas, Grapevine, United States
Duration: 9 Jan 201713 Jan 2017
Conference number: (AIAA 2017-1355)


ConferenceAIAA SciTech Forum 2017
CountryUnited States
Internet address


In this work, the effect of aircraft flexibility on 1g and gust loads is investigated. A commercial aircraft with high aspect ratio wings (HARW) is generated as a baseline case using an in-house sizing tool, with variants of the aircraft created with a reduced stiffness via changes in skin thicknesses, including the associated mass reduction. These aircraft variants are modelled using an aeroelastic code based on an intrinsic beam theory in order to understand the effects of large, geometrically nonlinear deformations on the loads due to level flight and atmospheric turbulence in the form of "1-minus-cosine" gusts. The full, nonlinear results are compared to the same results obtained from the linear system and the linearised system to determine the limits of linear analyses on gust loads predictions. It was seen that reducing the wing stiffness on the baseline aircraft reduced 1g loads due to mass reduction, and also reduced the certain loads envelopes such as root torque and root bending moment by around 17% and 41%, respectively, compared to the baseline. Linear analyses consistently over-predicted these loads as well as the critical gust length, even for the stiffest cases, but severely under-predicted axial and fore-aft loads. However, the large deformations at 1g trim did not cause any round-the-clock gusts to become more critical than a purely vertical gust.

    Research areas

  • High aspect ratio, Aeroelasticity, Gust, aerogust

    Structured keywords

  • AWI


AIAA SciTech Forum 2017: 58th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

Conference number(AIAA 2017-1355)
Duration9 Jan 201713 Jan 2017
Location of eventTexas
CountryUnited States
Web address (URL)

Event: Conference

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  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via AIAA at Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 1.45 MB, PDF document


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