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- 저자 : Zikang Li (검색결과 2 건)
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Zikang Li,Deqing Huang,Liangcheng Cai 제어·로봇·시스템학회 2024 International Journal of Control, Automation, and Vol.22 No.3
In this paper, a finite-time tracking control strategy for high-speed trains (HSTs) subjected to inputconstraints and parameter uncertainties is proposed based on adaptive nonsingular terminal sliding mode control(ANTSMC), which achieves the fast and precise displacement-speed trajectory tracking and energy saving results. The dynamic model of HST is established with the basic, additional, and external disturbances firstly. To handle input constraints, a smooth hyperbolic function is designed to approximate saturation function, which guarantees thatthe control signal does not exceed traction/braking characteristics and ensures safe operation. Then, an adaptivemechanism is used to estimate the upper bounder of the lumped uncertainty and controller’s parameters. Subsequently, the proposed ANTSMC methodology not only assures the finite-time convergence of position and velocitytracking errors, but also effectively compensates parameter uncertainties of the proposed model. Finally, numerical simulations indicate that the proposed method spends the less traction energy in obtaining the better trackingperformance of HST.
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Liu, Shude,Hui, Kwan San,Hui, Kwun Nam,Li, Hai-Feng,Ng, Kar Wei,Xu, Jincheng,Tang, Zikang,Jun, Seong Chan The Royal Society of Chemistry 2017 Journal of Materials Chemistry A Vol.5 No.36
<▼1><P>Cycling stability of an asymmetric supercapacitor is enhanced using hierarchical porous NiGa2O4 nanosheets as cathode electrode.</P></▼1><▼2><P>Rational design of the composition and electrochemically favorable structural configuration of electrode materials are highly required to develop high-performance supercapacitors. Here, we report our findings on the design of interconnected NiGa2O4 nanosheets as advanced cathode electrodes for supercapacitors. Rietveld refinement analysis demonstrates that the incorporation of Ga into NiO leads to a larger cubic lattice parameter that promotes faster charge-transfer kinetics, enabling significantly improved electrochemical performance. The NiGa2O4 electrode delivers a specific capacitance of 1508 F g<SUP>−1</SUP> at a current density of 1 A g<SUP>−1</SUP> with a capacitance retention of 63.7% at 20 A g<SUP>−1</SUP>, together with excellent cycling stability after 10 000 charge–discharge cycles (capacitance retention of 102.4%). An asymmetric supercapacitor device was assembled by using NiGa2O4 and Fe2O3 as cathode and anode electrodes, respectively. The ASC delivers a high energy density of 45.2 W h kg<SUP>−1</SUP> at a power density of 1600 W kg<SUP>−1</SUP> with exceptional cycling stability (94.3% cell capacitance retention after 10 000 cycles). These results suggest that NiGa2O4 can serve as a new class cathode material for advanced electrochemical energy storage applications.</P></▼2>
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