Unsteady Lift Suppression with a Robust Closed Loop Controller
Unsteady Lift Suppression with a Robust Closed Loop Controller
复制标题
使用稳健的闭环控制器抑制不稳定升力
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
T. Colonius
中科院分区：
文献类型：
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作者：
David R. Williams;Wesley Kerstens;J. Pfeiffer;R. King;T. Colonius
使用三维、低展弦比机翼和脉冲吹气执行器作为测试品，通过实验检验了使用主动流量控制来控制非定常流中升力的能力。非定常流风洞用于产生流速的阶跃振荡和简谐振动以及机翼上相应的脉动升力。使用传统的系统识别技术获得机翼驱动响应的“黑匣子”模型。鲁棒的 H ∞ 控制器采用混合灵敏度环路整形技术设计，其目标是在非定常流中保持恒定的升力。该控制器被证明能够在给定阶跃、谐波和随机输入干扰条件下显着减少升力波动。
The ability to control lift in unsteady flows using active flow control is examined experimentally with a three-dimensional, low-aspect-ratio wing and pulsed-blowing actuators as the test article. An unsteady flow wind tunnel is used to generate step-like and harmonic oscillations in flow speed and the corresponding fluctuating lift force on the wing. A ‘black box’ model of the wing response to actuation is obtained using conventional system identification techniques. A robust H ∞ controller is designed with a mixed sensitivity loop-shaping technique, whose objective was to maintain a constant lift in the unsteady flow. The controller is shown to be capable of significant reductions in lift fluctuations given step, harmonic and random input disturbance conditions.