How Structural Model Variability Influences Transonic Aeroelastic Stability

S. Marques, K. J. Badcock, H. H. Khodaparast, J. E. Mottershead

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

This paper considers the ways in which structural model parameter variability can influence aeroelastic stability. Previous work on formulating the stability calculation (with the Euler equations providing the aerodynamic predictions) is exploited to use Monte Carlo, interval, and perturbation calculations to allow this question to be investigated. Three routes are identified. The first involves variable normal-mode frequencies only. The second involves normal-mode frequencies and shapes. Finally, the third, in addition to normal-mode frequencies and shapes, also includes their influence on the static equilibrium. Previous work has suggested only considering the first route, which allows significant gains in computational efficiency if reduced-order models can be built for the aerodynamics. However, results in the current paper show that neglecting the mode-shape variation can give misleading results for the flutter-onset prediction, complicating the development of reduced aerodynamic models for variability analysis.
Original languageEnglish
Pages (from-to)1189-1199
Number of pages11
JournalJournal of Aircraft
Volume49
Issue number5
DOIs
Publication statusPublished - Sep 2012
Externally publishedYes

Keywords

  • Flutter, Uncertainty, CFD

ASJC Scopus subject areas

  • Aerospace Engineering

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