Nonlinear system identification of a pitching wing in a surging flow

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

Abstract

Many engineering applications involve lifting surfaces (wings) that oscillate about in pitch, heave, and/or stream-wise (referred to as surge). For small pitch amplitudes, under the stall angle of attack, the lift force will respond linearly to such oscillations. However, at sufficiently large amplitudes, unsteady flow separation and dynamic stall set in, and the lift force becomes a nonlinear function. Data-driven models are typically linear, and therefore, they often fail to capture the nonlinear response related to unsteady separation. In this work, we use wind tunnel experiments of a wing under harmonic pitching and surging such that it oscillates in and out of the nonlinear regime. We then use nonlinear system identification techniques to 1) identify the best linear approximation (BLA) between output (lift) and input (angle of attack, wind speed), 2) compare the BLA estimates with the classical power spectra estimates, 3) study the (in)effectiveness of (non)linear state space models in the linear and nonlinear flow regimes, 4) evaluate the possibility of interpolating between different measurements.
Original languageEnglish
Title of host publicationProceedings of the International Conference on Noise and Vibration Engineering (ISMA)
EditorsW. Desmet, B. Pluymers, D. Moens, S. Vandemaele
Pages939-954
Number of pages15
ISBN (Electronic)9789082893113
Publication statusPublished - 1 Jan 2020
EventInternational Conference on Noise and Vibration Engineering 2020 - Leuven, Belgium
Duration: 7 Sep 20209 Sep 2020

Publication series

NameProceedings of ISMA 2020 - International Conference on Noise and Vibration Engineering and USD 2020 - International Conference on Uncertainty in Structural Dynamics

Conference

ConferenceInternational Conference on Noise and Vibration Engineering 2020
Abbreviated titleISMA2020
CountryBelgium
CityLeuven
Period7/09/209/09/20

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