Fuzzy logic models for unsteady post stall maneuver
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摘要: 对模糊逻辑建模方法进行了深入的研究,讨论了非定常气动力的模糊逻辑建模与参数辨识方法,针对其在飞机非定常气动力建模与辨识中的应用提出新的思路,使之更具有实用性,并应用于实际算例的计算分析中.利用振荡三角翼的试验数据建立了非定常气动力的两种模糊逻辑模型:一种采用减缩频率进行建模,另一种考虑时间历程对非定常气动力的影响.结果表明,所建立模糊逻辑模型的计算结果与实验数据结果符合较好.采用这两种不同的模糊逻辑模型对飞机的眼镜蛇机动进行了模拟、仿真,检验了模型的实用性.Abstract: The fuzzy logic models of unsteady aerodynamics were lucubrated. The system′s fuzzy logic models, structures and parameters identification and model establishment were researched. The new modeling method makes the models has more abroad practicability. With using the typical test data, fuzzy logic modeling of nonlinear unsteady aerodynamic was developed. First, two fuzzy logic models of unsteady aerodynamics of oscillating delta wing were developed. One model employs the reduced frequency, the other uses the incidence history to account for the unsteadiness of flow characteristics. It was shown that both model results agree with the experimental values. Second, these two fuzzy logic models were used to simulate the typical post-stall Cobra maneuver, and the applicability of these two fuzzy logic models were demonstrated.
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Key words:
- fuzzy logic /
- unsteady aerodynamics /
- Cobra maneuver
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