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- W2997378300 abstract "Air vehicle gust encounters can result in extreme loads that are detrimental for stability. This is a particular problem for micro-air vehicles which generally fly at speeds on the same order as atmospheric gust velocities. In order to improve controllability in these situations, this paper studies the potential of using active pitch motions to mitigate gust effects. Experiments, performed at a Reynolds number of 30 000, expose a flat plate wing to a high-amplitude gust (gust ratio = 1). The responses of three different pitch profiles are compared in order to determine their potential for load mitigation. The first profile maintains a zero mean effective angle of attack throughout the gust encounter. The second profile is calculated using a vortex method which captures effects due to shed vorticity and added mass. These two profiles achieve a 75$%$ reduction of the gust lift response. The final profile is a combination of the previous two pitch profiles after completing additional corrections, and achieves a 95% mitigation of the uncontrolled lift response. This demonstrates that a high-amplitude gust can be alleviated using only a single degree-of-freedom pitch motion. The importance of shed vorticity behaviour is highlighted by an analysis of the three pitch profiles, which displays different trends when the wing enters and exits the gust, despite the symmetry of the gust profile." @default.
- W2997378300 created "2020-01-10" @default.
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- W2997378300 date "2020-01-05" @default.
- W2997378300 modified "2023-09-26" @default.
- W2997378300 title "Negating Gust Effects by Actively Pitching a Wing" @default.
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- W2997378300 doi "https://doi.org/10.2514/6.2020-1057" @default.
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