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Qiangang Zheng,Shuwei Pang,Haibo Zhang,Zhongzhi Hu 한국항공우주학회 2019 International Journal of Aeronautical and Space Sc Vol.20 No.4
For enhancing engine response ability, a novel nonlinear model predictive control (NMPC) method for aero-engine direct thrust control is proposed. The control objective of the proposed method is the thrust instead of the measurable parameters. The online-sliding window deep neural network (OL-SW-DNN) is proposed as predictive model. The OL-SW-DNN adopts deep-learning structure to increase the model accuracy and selects the nearest point data of certain length as training data which will reduce the sensitivity for the noise of training data. The direct thrust simulations of the popular NMPC based on extended Kalman filler (EKF) and the proposed one are conducted, respectively. The simulations demonstrate that compared with the popular NMPC, the proposed NMPC decreases the acceleration time by 0.425 s and increases response speed about 1.14 times.
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Changpeng Cai,Qiangang Zheng,Yong Wang,Haibo Zhang,Fengyong Sun 한국항공우주학회 2023 International Journal of Aeronautical and Space Sc Vol.24 No.2
The acceleration performance of aero-engine is an important guarantee to realize the rapid maneuvering of aircraft. The sharp change of inlet temperature of turbine caused by acceleration process poses a great challenge to the service life of high pressure turbine guide vane, and then influences engine life. How to reach a compromise between the acceleration performance and service life is one of the troublesome issues in the design and research of aero-engine control system. To handle this problem, this paper proposes an engine acceleration control method with variable outlet bleed of compressor considering the life of high pressure turbine guide vane. SQP algorithm is adopted to take into account the mechanical thermal fatigue life of turbine guide and the shortest acceleration time as the optimization objectives. In the acceleration process, the outlet bleed of compressor is adjusted to shorten the acceleration time. The simulation results demonstrate that compared with the conventional acceleration control method, the variable bleed acceleration control can decrease the acceleration time by 10%. While considering the service life of high pressure turbine guide vane, on the premise of the same acceleration time as the conventional method, the temperature gradient of high pressure turbine guide vane is reduced by 50%, the number of safe life cycles increase by 24%, and the service life of high pressure turbine guide vane is effectively enhanced.
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One-Step Solvothermal Synthesis of Tetranitro-Cobalt Phthalocyanine/Reduced Graphene Oxide Composite
Lijuan Zhang,Hejun Li,QIANGANG FU,Zhanwei Xu,Kezhi Li,Jianfeng Wei 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.3
Tetranitro-cobalt phthalocyanine/reduced graphene oxide (TNCoPc/RGO) composite was prepared using ethylene glycol as reducing agent and precursor. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR) were used to characterize the composite. The electrochemical performance of the composite was examined by cyclic voltammetry and rotating disk electrode. The SEM observation and UV-Vis absorption spectrophotometer reveal that TNCoPc nanoparticles are closely contacted with RGO. The results show that the composite has a larger peak current and a higher current density than TNCoPc for oxygen reduction in an alkaline medium. This work offers a simple and environmental route for the synthesis of metal phthalocyanine (MPc)/RGO, which is adaptable to a wide range of applications in fuel cells.
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ZHEN SUN,Hejun Li,Kezhi Li,QIANGANG FU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.6
Graphene platelets with a large scale have been synthesized by reduction of graphene oxide (GO)in aqueous solution of hydrazine hydrate under microwave irradiation (MWI). Microstructure ofthe graphene was characterized by X-ray di®raction (XRD), Raman spectroscopy, atomic forcemicroscopy (AFM) and transmission electron microscopy (TEM) together with the selected areaelectron di®raction (SAED). The electrochemical properties were evaluated by the analysis ofcyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) in 1 M Na 2 SO 4aqueous solution. The results show that the as-prepared materials consist of crumpled, few-layer( ? 3 nm) thick and electronically conductive graphitic sheets. The supercapacitors fabricatedusing this material possess a low equivalent series resistance (ESR) value ? 1.6 ? and a highspeci¯c capacitance of 285 F ? g ? 1 . In addition, the graphene reduced under a diverse duration ofMWI displays a di®erent interlayer spacing, extent of reduction, level of graphitization andspeci¯c capacitances. The duration of MWI and the treatment methods strongly a®ect the mi-crostructure of graphene, and then dominate its electrochemical properties.
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