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- 저자 : Dejie Li (검색결과 3 건)
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Sliding Mode Predictive Active Fault-tolerant Control Method for Discrete Multi-faults System
Pu Yang,Zhangxi Liu,Dejie Li,Zhiqing Zhang,Zixin Wang 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.3
For discrete systems with sensor and actuator failures, this paper proposes an observer that can estimate both sensor failures and actuator failures and designs a sliding mode predictive fault-tolerant control method based on an improved whale optimization algorithm. First, a proportional-integral observer that can observe actuator fault and sensor fault is designed to estimate the value of faults, which greatly improves the work efficiency. After that, a global sliding mode surface is designed as a prediction model, so that the initial state of the system is located on the sliding mode surface to avoid the instability of the sliding mode approaching the process. The reference trajectory of a power function with uncertainty and disturbance compensation is designed to reduce the bad influence of uncertainty and disturbance on the system and suppress chattering greatly. Meanwhile, in the rolling optimization part, an improved whale optimization algorithm(IWOA) is designed to optimize the control law. Finally, the simulation results on the four-rotor helicopter simulation platform show the practicability and superiority of the algorithm.
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Wang, Bin,Huang, Ming,Tao, Li,Lee, Sun Hwa,Jang, A-Rang,Li, Bao-Wen,Shin, Hyeon Suk,Akinwande, Deji,Ruoff, Rodney S. American Chemical Society 2016 ACS NANO Vol.10 No.1
<P>We explored a support-free method for transferring large area graphene films grown by chemical vapor deposition to various fluoric self-assembled mono layer (F-SAM) modified substrates including SiO2/Si wafers, polyethylene terephthalate films, and glass. This method yields clean, ultrasmooth, and high-quality graphene films for promising applications such as transparent, conductive, and flexible films due to the absence of residues and limited structural defects such as cracks. The F-SAM introduced in the transfer process can also lead to graphene transistors with enhanced field-effect mobility (up to 10,663 cm(2)/Vs) and resistance modulation (up to 12x) on a standard silicon dioxide dielectric. Clean graphene patterns can be realized by transfer of graphene onto only the F-SAM modified surfaces.</P>
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Xiaoyu Zhang,Ying Han,Wenjiao Liu,Ning Pan,Dejie Li,Jinling Chai 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-
A W/O surfactant-free microemulsion (SFME) template-hydrothermal method for the preparation of ZnOproducts was proposed. Using the SFME system containing hexane, propan-2-ol and water, hexagonalcylinder-like (twinning) ZnO microcrystals were synthesized. The XRD, SEM and TEM characterizationsshowed that the synthesized ZnO microcrystals have a hexagonal wurtzite structure. At hydrothermaltemperatures of 120–140 C, hexagonal cylinder-like ZnO microcrystals were synthesized, whereas thehexagonal cylinder twinning ZnO microcrystals were obtained at 160 C. The growth mechanism of theZnO microcrystals was also investigated. The EPR and XPS spectra of the synthesized ZnO products showed that there are oxygen vacancies onthe ZnO surface. The photodegradation behavior of methylene blue (MB, 10 ppm) with a UV-Hg lamp(250 W) as the light source in ZnO aqueous suspension (0.3 g L 1) was investigated. The ZnO productsynthesized at 140 ℃ can significantly photocatalyze the degradation of lower concentration MBsolutions. After 35 min of irradiation, the photocatalytic decomposition rate reached 98.3%. It is hopedthat this work could serve as an important stepping stone for establishing a novel hydrothermal methodbased on SFME system, therefore paving the way for other potential ideas on the application of SFMEsystems.
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