Identification of freeplay and aerodynamic nonlinearities in a 2D aerofoil system with via higher-order spectra

M. Candon, R. Carrese, H. Ogawa, P. Marzocca

研究成果: Contribution to journalArticle査読

2 被引用数 (Scopus)

抄録

Higher-Order Spectra (HOS) are used to characterise the nonlinear aeroelastic behaviour of a plunging and pitching 2-degree-of-freedom aerofoil system by diagnosing structural and/or aerodynamic nonlinearities via the nonlinear spectral content of the computed displacement signals. The nonlinear aeroelastic predictions are obtained from high-fidelity viscous fluid-structure interaction simulations. The power spectral, bi-spectral and tri-spectral densities are used to provide insight into the functional form of both freeplay and inviscid/viscous aerodynamic nonlinearities with the system displaying both low- and high-amplitude Limit Cycle Oscillation (LCO). It is shown that in the absence of aerodynamic nonlinearity (low-amplitude LCO) the system is characterised by cubic phase coupling only. Furthermore, when the amplitude of the oscillations becomes large, aerodynamic nonlinearities become prevalent and are characterised by quadratic phase coupling. Physical insights into the nonlinearities are provided in the form of phase-plane diagrams, pressure coefficient distributions and Mach number flowfield contours.

本文言語英語
ページ(範囲)1530-1560
ページ数31
ジャーナルAeronautical Journal
121
1244
DOI
出版ステータス出版済み - 10 1 2017
外部発表はい

All Science Journal Classification (ASJC) codes

  • 航空宇宙工学

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