This paper presents an unsteady, discrete vortex model to simulate the unsteady aerodynamics of a wing encountering a large-amplitude transverse gust with a sine-squared velocity profile. The model is used to investigate wing-gust encounters and the impact of closed-loop control on mitigating the gust. A simple proportional closed-loop control law to regulate lift during a gust encounter is selected by evaluating its rejection of lift disturbances using Theodorsen’s unsteady aerodynamic model. The control law is tested on the discrete vortex model and is shown to reduce the peak lift coefficient of the gust encounter by 92.3 1.00. The flowfield and vorticity shedding behavior of the leading edge is studied, and the effect of closed-loop control on the circulatory contribution to lift is discussed. The total lift force is decomposed into its individual contributions to study the various mechanisms involved in achieving the lift regulation objective.

中文翻译：

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横向阵风时升力调节的不稳定空气动力学

本文提出了一个不稳定的，离散的涡流模型，以模拟机翼在遇到具有正弦平方速度分布的大幅度横向阵风时的不稳定空气动力学特性。该模型用于研究机翼阵风的遭遇以及闭环控制对减轻阵风的影响。通过使用Theodorsen的非稳态空气动力学模型评估其对升力干扰的抑制作用，选择了一种简单的比例闭环控制律来调节阵风时的升力。控制律在离散涡模型上进行了测试，结果表明将阵风的峰值升力系数降低了92.3 1.00。研究了前缘的流场和涡旋脱落行为，并讨论了闭环控制对升力的循环贡献的影响。