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Authors = Shuitao Yu

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19 pages, 4770 KB  
Article
RBFNN-Based Anti-Input Saturation Control for Hypersonic Vehicles
by Bangchu Zhang, Yiyong Liang, Shuitao Rao, Yu Kuang and Weiyu Zhu
Aerospace 2024, 11(2), 108; https://doi.org/10.3390/aerospace11020108 - 24 Jan 2024
Cited by 17 | Viewed by 3572
Abstract
In hypersonic flight control, characterized by challenges posed by input saturation, model parameter uncertainties, and external disturbances, this paper introduces a pioneering anti-input saturation control method based on RBFNN adaptivity. We have developed adaptive laws to enhance control system adaptability and robustness by [...] Read more.
In hypersonic flight control, characterized by challenges posed by input saturation, model parameter uncertainties, and external disturbances, this paper introduces a pioneering anti-input saturation control method based on RBFNN adaptivity. We have developed adaptive laws to enhance control system adaptability and robustness by integrating mission profiles, actuator saturation failure modes, and self-evolving neural network design. Furthermore, our approach introduces a novel anti-input saturation auxiliary system, effectively addressing input saturation constraints. This innovation ensures system stability and precise tracking, even in severe input saturation constraints. The results reveal that the system’s steady-state tracking error remains under 2% under input saturation constraints, and the convergence speed demonstrates an impressive 20% improvement. These findings underscore this research’s substantial advancement in hypersonic flight control. It may significantly enhance the controllability and performance of hypersonic vehicles in real-world scenarios. Full article
(This article belongs to the Special Issue Flight Dynamics, Control & Simulation)
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4 pages, 663 KB  
Short Note
4-Chloro-2,3,5-trifluorobenzoic Acid
by Shuitao Yu, Xiaohu Feng, Weiyou Zhou, Zhengjun Xia, Mingguang Zhang, Yang Chen and Zaixin Chen
Molbank 2015, 2015(4), M871; https://doi.org/10.3390/M871 - 3 Nov 2015
Viewed by 4089
Abstract
A new tetrahalogenated benzoic acid 4-chloro-2,3,5-trifluorobenzoic acid was synthesized from methyl 2,3,4,5-tetrafluorobenzoate via three steps. The structure of the newly synthesized compound was established by FTIR, NMR, MS and elemental analysis. Full article
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4 pages, 188 KB  
Short Note
(R)-7-(Azepan-3-ylamino)-8-chloro-1-cyclopropyl-6-fluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic Acid Hydrochloride
by Zhengjun Xia, Zaixin Chen and Shuitao Yu
Molbank 2013, 2013(2), M801; https://doi.org/10.3390/M801 - 22 May 2013
Viewed by 5008
Abstract
In this paper (R)-7-(azepan-3-ylamino)-8-chloro-1-cyclopropyl-6-fluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid hydrochloride 1 was isolated and identified as the N-substituted regioisomer of besifloxacin, which has been synthesized from the reaction of 8-chloro-1-cyclopropyl-6,7-difluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid 3 with (R)-tert-butyl 3-aminoazepane-1-carboxylate 2 in acetonitrile as solvent in 37% [...] Read more.
In this paper (R)-7-(azepan-3-ylamino)-8-chloro-1-cyclopropyl-6-fluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid hydrochloride 1 was isolated and identified as the N-substituted regioisomer of besifloxacin, which has been synthesized from the reaction of 8-chloro-1-cyclopropyl-6,7-difluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid 3 with (R)-tert-butyl 3-aminoazepane-1-carboxylate 2 in acetonitrile as solvent in 37% yield. The chemical structure of compound 1 was established on the basis of 1H-NMR, 13C-NMR, mass spectrometry data and elemental analysis. Full article
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