Characterization of a 3DOF aeroelastic system with freeplay and aerodynamic nonlinearities Part I: Higher-order spectra

Candon, M, Carrese, R, Ogawa, H, Marzocca, P, Mouser, C, Levinski, O and Silva, W 2018, 'Characterization of a 3DOF aeroelastic system with freeplay and aerodynamic nonlinearities Part I: Higher-order spectra', Mechanical Systems and Signal Processing, vol. 118, pp. 628-643.


Document type: Journal Article
Collection: Journal Articles

Title Characterization of a 3DOF aeroelastic system with freeplay and aerodynamic nonlinearities Part I: Higher-order spectra
Author(s) Candon, M
Carrese, R
Ogawa, H
Marzocca, P
Mouser, C
Levinski, O
Silva, W
Year 2018
Journal name Mechanical Systems and Signal Processing
Volume number 118
Start page 628
End page 643
Total pages 16
Publisher Elsevier
Abstract The identification of nonlinear systems in aeroelasticity poses a significant challenge for practitioners, often hampered by the complex nature of aeroelastic response data which may contain multiple forms of nonlinearity. Characterizing and quantifying nonlinearities is further hampered when the response is obtained at a location which is away from the nonlinear source and/or the response is contaminated by noise. In the present paper, a three-degree-of-freedom airfoil with a freeplay nonlinearity located in the control surface and exposed to transonic flow is investigated. In this Part I paper the main form of analysis is via higher-order spectra techniques to unveil features of the nonlinear mechanism which result from i) structural nonlinearities (freeplay) in isolation and ii) freeplay with Euler derived nonlinear inviscid aerodynamic phenomena (transition between Tijdeman Type-A and Type-B shock motion). It is shown that the control surface structural freeplay non-linearity is characterized by strong cubic phase-coupling between linear and nonlinear modes. On the other hand, nonlinear inviscid flow phenomena are shown to be characterized by quadratic phase-coupling between linear and nonlinear modular modes, the strength of which is related to the strength of the aerodynamic nonlinearity (amplitude of the shock motion). The nonlinear inviscid flow phenomena do not appear to affect the identification of the freeplay nonlinearity. Conjectures are made which address the transition between aperiodic, quasi-periodic and periodic behavior (pre-flutter), further physical support towards these conjectures is provided in Part II [1]. The limitations of the higher-order spectra approach are assessed, in particular, the analysis demonstrates the difficulty in extracting natural frequencies with this approach.
Subject Aerospace Structures
Keyword(s) Nonlinear Aeroelasticity
System Identification
Higher-Order Spectra
Structural Freeplay
Aerodynamic Nonlinearity
Transonic Flow
LCO
Chaotic Response
DOI - identifier 10.1016/j.ymssp.2018.05.053
Copyright notice © 2018 Elsevier Ltd. All rights reserved.
ISSN 0888-3270
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