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Existence and Global Exponential Stability of Pseudo Almost Periodic Solutions of a General Delayed BAM Neural Networks

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Journal of Systems Science & Complexity 2018年第3期31卷 608-620页

作者： duan Lian School of Mathematics and Big Data Anhui University of Science and Technology

This paper studies a class of general BAM neural networks with multiple delays. Em- ploying the exponential dichotomy theory and fixed point method, together with constructing suitable Lyapunov functionals, easily verifiable delay-independent criteria are established to ensure the exis- tence and global exponential stability of pseudo almost periodic solutions, which not only generalize but also complement some existing ones. These theoretical results are also supported with numerical simulations.

关键词： General BAM neural network global exponential stability pseudo almost periodic solu-tion

Fully actuated system approaches for continuous-time delay systems: part 1. Systems with state delays only

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Science China(Information Sciences) 2023年第2期66卷 158-187页

作者： Guangren duan Center for Control Science and Technology Southern University of Science and Technology Center for Control Theory and Guidance Technology Harbin Institute of Technology

In this paper, the fully actuated system(FAS) approaches for continuous-time systems with time-varying state delays are proposed. Two types of continuous-time high-order FAS models with time delays: single-order time-delay FAS models and multi-order time-delay FASs, are proposed. Particularly, the type of sub-FASs that do not completely but partially satisfy the full actuation is investigated, and the sets of feasible points are defined. When the system states are constrained to the feasible set, a controller can be easily constructed for the sub-FAS such that the closed-loop system is a constant linear system with an arbitrarily assignable eigenstructure. In addition, it is demonstrated that the feasibility constraint can be transformed into a constraint on the initial values of the system, which vanishes when the system is a(global)FAS. Based on the unique control characteristic of the type of FAS models, the concepts of controllability and stabilizability of general dynamical time-delay systems are also proposed. The effect of the proposed theories is illustrated with examples.

关键词： time-delay systems fully actuated systems controller designs controllability stabilizability

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Discrete-time delay systems: part 1. Global fully actuated case

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Science China(Information Sciences) 2022年第8期65卷 87-104页

作者： Guangren duan Center for Control Science and Technology Southern University of Science and Technology Center for Control Theory and Guidance Technology Harbin Institute of Technology

A basic introduction to the fully actuated system(FAS) approaches for discrete-time systems with delays is given. Firstly, general dynamical discrete-time FAS models with time-varying state delays and constant input delays are proposed. The FAS models are classified into affine ones and non-affine ones,and also ones with and without interconnections. Secondly, controllers for such FASs are designed, which result in constant linear closed-loop systems with arbitrarily assignable eigenstructure. Different from the case of FAS with state delays only, the controller for a discrete-time FAS with an input delay involves a prediction scheme which is constructed based on the open-loop system. The contribution of this paper has laid a fundamental basis for FAS approaches to discrete-time delay systems, and further specific analysis and design problems can be established similar to the continuous-time system case.

关键词： discrete-time systems time-delay systems time-varying delays fully actuated systems control designs

Reliability-based selective maintenance for redundant systems with dependent performance characteristics of components

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Journal of Systems Engineering and Electronics 2023年第3期34卷 804-814页

作者： CAO Hui duan Fuhai duan Yu’nan School of Mechanical Engineering Dalian University of TechnologyDalian 116024China

The reliability-based selective maintenance(RSM)decision problem of systems with components that have multiple dependent performance characteristics(PCs)reflecting degradation states is addressed in this paper.A vine-Copulabased reliability evaluation method is proposed to estimate the reliability of system components with multiple ***,the marginal degradation reliability of each PC is built by using the Wiener stochastic process based on the PC’s degradation *** joint degradation reliability of the component with multiple PCs is established by connecting the marginal reliability of PCs using *** addition,two RSM decision models are developed to ensure the system accomplishes the next *** genetic algorithm(GA)is used to solve the constraint optimization problem of the models.A numerical example illustrates the application of the proposed RSM method.

关键词： D-vine genetic algorithm(GA) reliability-based selective maintenance(RSM) redundant system Wiener stochastic process

新质生产力视域下新能源汽车技能人才培养模式研究

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职业技术 2025年第1期24卷 7-12页

作者：段姣雯天津交通职业学院天津300380

新质生产力是先进生产力的体现形式,是马克思主义生产力理论的中国创新和实践,为职业教育高质量发展提出了新的机遇与挑战。文章以新能源汽车产业为研究对象,将汽车产业链发展与技能人才的知识、技能、素养对接,分别从新质生产力视角、... 详细信息

新质生产力是先进生产力的体现形式,是马克思主义生产力理论的中国创新和实践,为职业教育高质量发展提出了新的机遇与挑战。文章以新能源汽车产业为研究对象,将汽车产业链发展与技能人才的知识、技能、素养对接,分别从新质生产力视角、人才培养教学模式视角探究“知识共生、技能孪生、素养衍生”的技能人才培养路径。

关键词：新质生产力新能源汽车人才培养模式

Brockett's Second Example:A FAS Approach Treatment

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Journal of Systems Science & Complexity 2023年第5期36卷 1789-1808页

作者： duan Guang-Ren Shenzhen Key Laboratory of Control Theory and Intelligent Systems Southern University of Science and TechnologyShenzhen 518055China Center for Control Theory and Guidance Technology Harbin Institute of TechnologyHarbin 150001China

In this paper,several equivalent forms of the well-known Brockett's second example system are firstly *** stabilization of the system is then treated in the fully actuated system approach.A simple continuous time-invariant sub-stabilizing controller is designed,and the corresponding region of attraction is *** a result,all trajectories of the system starting from the characterized region of attraction are driven exponentially to the *** the region of attraction is very large,the designed sub-stabilizing controller can be directly useful in many practical *** cases where the initial values are indeed needed to be chosen out of the region of attraction,extremely simple pre-controllers can be designed,which drive the system trajectories into the designed region of attraction.A simulation of the designed control system is carried out to show the effect of the proposed approach.

关键词： Brockett integrator continuous time-invariant controllers fully actuated system approach region of attraction sub-stabilization

Brockett’s First Example: An FAS Approach Treatment

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Journal of Systems Science & Complexity 2022年第2期35卷 441-456页

作者： duan Guang-Ren Center for Control Science and Technology Southern University of Science and TechnologyShenzhen 518055China Center for Control Theory and Guidance Technology Harbin Institute of TechnologyHarbin 150001China

In this note,the well-known Brockett’s first example system is treated with the fully actuated system(FAS)***,it is shown that the system can be exponentially substabilized by a smooth controller in the sense that,except those starting from initial values on the z0-axis of the initial value space,all trajectories of the designed system as well as the control signals decay to zero ***,global stabilization is realized through a way of enabling the trajectories starting from initial values on the z0-axis also to go to the *** idea is to firstly move an initial point on the z0-axis away from the axis using a pre-controller,and then to take over by the designed exponentially sub-stabilizing controller.

关键词： Exponential sub-stabilization feedback stabilization fully actuated system approach region of attraction singularity sets

Stabilization via Fully Actuated System Approach:A Case Study

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Journal of Systems Science & Complexity 2022年第3期35卷 731-747页

In this note,a benchmark example system which is not stabilizable by a smooth state feedback controller is considered with the fully actuated system(FAS)*** is shown that a smooth controller exists which drives the trajectories starting from a large domain in the initial value space to the origin *** a result brings about a generalization of Lyapunov asymptotical stability,which is termed as global exponential *** region of attraction is allowed to be an unbounded open set of the initial values with closure containing the *** sub-stability result may be viewed to be superior to some local stability results in the Lyapunov sense because the region of attraction is much larger than any finite ball containing the origin and meanwhile the feasible trajectories are always driven to the origin *** on this sub-stabilization result,globally asymptotically stabilizing controllers for the system can be provided in two general ways,one is through combination with existing globally stabilizing controllers,and the other is by using a pre-controller to first move an initial point which is not within the region of attraction into the region of attraction.

关键词： Feedback stabilization fully actuated system approach nonlinear systems region of attraction singularity sets

The energy and water cycles under climate change

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National Science Review 2020年第3期7卷 553-557页

作者： Qingyun duan Anmin duan Hohai University the Institute of Atmospheric Physics Chinese Academy of Sciences

Energy and water cycles have been a hot research topic in the global scientific community. The global climate change observed over the last century is having a profound impact on global and regional energy and water cycles, leading to more frequent extreme climatic events and affecting water security, ecosystem and socioeconomic development around the world. The impact is especially obvious over the highland regions such as the Tibetan Plateau. Here we have an interview with one of world’s most renowned experts in hydroclimatology,Professor Soroosh Sorooshian from the University of California at Irvine, to share his insights on the subject of energy and water cycles.

关键词： cycle GEWEX The energy and water cycles under climate change