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Robust Nonsingular Fixed Time Terminal Sliding Mode Control for Atmospheric Pollution Detection Lidar Scanning Mechanism
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作者 KANG Yu YANG Yuxiao +2 位作者 CHEN Cai LüWenjun ZHAO Yunbo 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2023年第2期500-523,共24页
A robust nonsingular fixed time terminal sliding mode control scheme with a time delay disturbance observer is proposed for atmospheric pollution detection lidar scanning mechanism(APDL-SM)system.Distinguished from th... A robust nonsingular fixed time terminal sliding mode control scheme with a time delay disturbance observer is proposed for atmospheric pollution detection lidar scanning mechanism(APDL-SM)system.Distinguished from the conventional terminal sliding mode control methods,the authors design a novel fixed-time terminal sliding surface,the convergence time of sliding mode phase of which has a constant upper bound that is designable by adjusting only one parameter.Moreover,in order to overcome the problem of unknown upper bound of lumped uncertainty including model uncertainty,friction effect and external disturbances from the port environment,the authors propose a time delay disturbance observer to provide an estimation for the system lumped uncertainty.By using the Lyapunov synthesis,the explicit analysis of the convergence time upper bound are performed.Finally,simulation studies are conducted on the APDL-SM system to show the fast convergence rate and strong robustness of the proposed control scheme. 展开更多
关键词 Atmospheric pollution detection lidar fixed time terminal sliding mode time delay disturbance observer tracking control
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Relay Selection Strategy in the Secure Cooperative Communications System
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作者 Hsin-Ying Liang Cheng-Ying Yang Wei-Liang Wu 《Journal of Electronic Science and Technology》 CAS CSCD 2017年第3期271-276,共6页
With the low cost and low hardware complex considerations,cooperative systems are a tendency in the future communications.This work considers the secure cooperative communications systems.For a practical situation in ... With the low cost and low hardware complex considerations,cooperative systems are a tendency in the future communications.This work considers the secure cooperative communications systems.For a practical situation in the system,the scenario includes multiple source stations,multiple relay stations,multiple destination stations,and eavesdroppers.To analyze the optimal relay selection in the system,we begin with the performance analysis for a single source station and a single destination station.By applying two cooperative models,the amplify-andforward(AF) mode and decode-and-forward(DF)mode,the secrecy capacity is derived.Then,we apply the derived results to the considered environment to find the optimal relay assignment.By the way,the relay selection can be obtained by the exhaustive search algorithm.However,there are a lot of steps needed if the number of source stations is large.Hence,applying the characters of the cooperative modes in the relay selection,the pre-selection step is proposed with a mathematical derivation.It could be used for the practical situation without a long-time calculation. 展开更多
关键词 Index Terms--Amplify-and-forward (AF) mode exhaustive search method fixed decode-and-forward(DF) mode mutual information relay selection secrecycapacity secure cooperative communications.
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Normal Decentralized Dynamic Compensators' Design for Singular Decentralized Control Systems
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作者 GAO Zhiwei WANG Xianlai LI Guangquan Department of Automation, Tianjin University, Tianjin 300072 《Systems Science and Systems Engineering》 CSCD 1998年第3期17-26,共10页
The design of normal decentralized dynamic compensators for the internal properness and stability of singular decentralized control systems is investigated, and an effective sequential design approach is presented.
关键词 singular systems decentralized control properness and stability COMPENSATORS fixed modes.
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