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Modeling and control of parafoils based on computational fluid dynamics

机译：基于计算流体动力学的平面液的建模与控制

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The determination of aerodynamic parameters of parafoil canopies has been a crucial issue because it affects the model precision. To calculate the aerodynamic coefficients of a canopy, the lifting-line theory has been used in the traditional method. However, because of the existence of leading-edge incisions, there are some restrictive assumptions in lifting-line theory when one is calculating the aerodynamic coefficients of a canopy. Therefore in this article we calculate the aerodynamic coefficients on the basis of computational fluid dynamics. As an improvement, the effects of a leading-edge incision and trailing edge deflection are considered. Firstly, lift and drag coefficients are obtained by use of computational fluid dynamics. Then the least-squares method is used to identify incision and deflection factors. Furthermore, an eight-degrees-of-freedom mathematical model of a parafoil system is established on the basis of the parameters obtained. Finally, a novel control algorithm, generalized predictive control based on a characteristic model, is applied to the system. The precision of the model established and the effectiveness of the proposed control method are validated by simulation and airdrop testing. (C) 2019 Elsevier Inc. All rights reserved.
机译：Parafoil Canopies的空气动力学参数的测定是一个至关重要的问题，因为它影响了模型精度。为了计算冠层的空气动力学系数，在传统方法中使用了升降线理论。然而，由于领导切口的存在，当一个人计算冠层的空气动力学系数时，升降线理论存在一些限制性假设。因此，在本文中，我们基于计算流体动力学计算空气动力学系数。作为改进，考虑了前缘切口和后缘偏转的效果。首先，通过使用计算流体动力来获得升力和拖动系数。然后，最小二乘法用于识别切口和偏转因子。此外，基于所获得的参数建立了一条带有八大自由度的数学模型。最后，基于特征模型的新型控制算法，基于特征模型的广义预测控制。通过仿真和AirDrop测试验证了建立的模型的精度和所提出的控制方法的有效性。 （c）2019 Elsevier Inc.保留所有权利。

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