Journal
APPLIED MATHEMATICAL MODELLING
Volume 70, Issue -, Pages 378-401Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.apm.2018.12.006
Keywords
Computational fluid dynamics; Leading-edge incision; Deflection; Modeling; Characteristic model; Generalized predictive control
Funding
- National Natural Science Foundation of China [61273138, 61573197, 61603051]
- National Key Technology Research and Development Program of China [2015BAK06B04]
- Research Fund of Tianjin Key Laboratory of Process Measurement and Control [TKLPMC-201613]
- Austrian Science Funds (FWF) [P30031]
- Austrian Science Fund (FWF) [P30031] Funding Source: Austrian Science Fund (FWF)
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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.
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