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Fuzzy uncertainty analysis and reliability assessment of aeroelastic aircraft wings

Published online by Cambridge University Press:  10 February 2020

M. Rezaei Open the ORCID record for M. Rezaei [Opens in a new window] ,
S.A. Fazelzadeh Open the ORCID record for S.A. Fazelzadeh [Opens in a new window] ,
A. Mazidi Open the ORCID record for A. Mazidi [Opens in a new window] ,
M.I. Friswell Open the ORCID record for M.I. Friswell [Opens in a new window]  and
H.H. Khodaparast Open the ORCID record for H.H. Khodaparast [Opens in a new window]
M. Rezaei
Affiliation:
School of Mechanical Engineering Shiraz UniversityShirazIran
S.A. Fazelzadeh*
Affiliation:
School of Mechanical Engineering Shiraz UniversityShirazIran
A. Mazidi
Affiliation:
School of Mechanical Engineering Yazd UniversityYazdIran
M.I. Friswell
Affiliation:
College of Engineering Swansea UniversitySwanseaUnited Kingdom
H.H. Khodaparast
Affiliation:
College of Engineering Swansea UniversitySwanseaUnited Kingdom
*
Fazelzad@shirazu.ac.ir
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Abstract

In the present study, fuzzy uncertainty and reliability analysis of aeroelastic aircraft wings are investigated. The uncertain air speed and structural parameters are represented by fuzzy triangular membership functions. These uncertainties are propagated through the wing model using a fuzzy interval approach, and the uncertain flutter speed is obtained as a fuzzy variable. Further, the reliability of the wing flutter is based on the interference area in the pyramid shape defined by the fuzzy flutter speed and air speed. The ratio between the safe region volume and the total volume of the pyramid gives the reliability value. Two different examples are considered—a typical wing section, and a clean wing—and the results are given for various wind speed conditions. The results show that the approach considered is a low-cost but suitable method to estimate the reliability of the wing flutter speed in the presence of uncertainties.

Keywords

reliabilityuncertainty propagationfuzzy methodaeroelastic aircraftwing flutter
Type
Research Article
Information
The Aeronautical Journal , Volume 124 , Issue 1275 , May 2020 , pp. 786 - 811
Copyright
© Royal Aeronautical Society 2020

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