Aeroelastic inverse: Estimation of aerodynamic loads during large amplitude limit cycle oscillations

Kirschmeier, Benjamin; Pash, Graham; Gianikos, Zachary; Medina, Albert; Gopalarathnam, Ashok; Bryant, Matthew

doi:10.1016/j.jfluidstructs.2020.103131

Cited by 5 publications

(1 citation statement)

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“…For each elastic axis position, we measured the pitch oscillations of the airfoil with four different structural support stiffnesses. Moreover, the time response of 𝐶 𝑀 𝑒𝑎 can be measured using the inverse method [6,22]. The equation used in the inverse method is as follows.…”

Section: B Structural Motion Equationmentioning

confidence: 99%

New Viewpoint on the Mechanism of Laminar Separation Flutter

Lyu,

Lim,

Zhang

2023

AIAA Journal

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At transitional Reynolds numbers, an elastically supported airfoil oscillating in pitch can undergo laminar separation flutter (LSF), which is characterized by self-sustained small-amplitude oscillations. To gain insight into the mechanism of LSF, we conduct wind tunnel tests for [Formula: see text] to investigate the LSF response of a freely rotating NACA0015 airfoil with various structural natural frequencies and positions of the elastic axis. The experimental results show that the dominant mode of flow around the NACA0015 airfoil abruptly changes at [Formula: see text], resulting in a change in the trend of LSF response. Then, an aeroelastic model is constructed to explain how the instability of LSF arises. This model can accurately predict the LSF frequency of airfoils with various structural natural frequencies. Moreover, based on the aeroelastic model, we perform linear stability analysis on the aeroelastic system and propose the instability criterion for LSF as [Formula: see text]. This instability criterion is identical to that for rotational galloping of square cylinder, indicating that LSF and rotational galloping of square cylinder are essentially the same aeroelastic phenomenon that appears in different aerodynamic profiles. This finding identifies the underlying cause for the remarkable similarities between the two phenomena.

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Section: B Structural Motion Equationmentioning

confidence: 99%