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- 저자 : Liangcheng Cai (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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Thermo-optic Characteristics of Micro-structured Optical Fiber Infiltrated with Mixture Liquids
Ran Wang,Yuye Wang,Yinping Miao,Ying Lu,Nannan Luan,Congjing Hao,Liangcheng Duan,Cai Yuan,Jianquan Yao 한국광학회 2013 Current Optics and Photonics Vol.17 No.3
We present both theoretically and experimentally the thermo-optic characteristics of micro-structured optical fiber (MOF) filled with mixed liquid. The performance of MOF depends on the efficient interaction between the fundamental mode of the transmitted light wave and the tunable thermo-optic materials in the cladding. The numerical simulation indicates that the confinement loss of MOF presents higher temperature dependence with higher air-filling ratios d/Λ, longer incident wavelength and fewer air holes in the cladding. For the 4cm liquid-filled grapefruit MOF, we demonstrate from experiments that different proportions of solutions lead to tunable temperature sensitive ranges. The insertion loss and the extinction ratio are 3~4 dB and approximate 20 dB, respectively. The proposed liquid-filling MOF will be developed as thermo-optic sensor, attenuator or optical switch with the advantages of simple structure, compact configuration and easy fabrication.
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