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Acta Metallurgica Sinica(English Letters) 2014年第5期27卷 862-868页

作者： Shulin Lü Shusen Wu chong lin Ping An State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology

In this research, the in situ Si and Fe-rich particles reinforced Al matrix composites were fabricated by rheocasting （RC） process assisted with ultrasonic vibration （USV）. After USV treatment, the polygonal primary Si crystals were refined into particles with average diameter of about 15-23 μm, and the fraction of primary Si declined to about 5.4-6.5 vol%. The coarse plate-like δ-Al4（Fe,Mn）Si2 phase was transformed into fine particles with average diameter of about 17-20 μm, and the fraction of particle-like Fe-bearing particles is about 3.6-5.3 vol%. The ultimate tensile strength of the RC composites increases with the increase of Fe content at 350 ℃. The increase of the elevated temperature strength of the composites is mainly attributed to the refinement of δ-Al4（（Fe,Mn）Si2 phase and the increase of the volume fraction of the Fe-bearing compounds. Compared with the composites without USV, the RC composites assisted with USV have thinner mechanical mixing layer in wear test, which corresponds to smaller wear rate.

关键词： Fe-bearing phase Metal matrix composites Microstructure Properties Ultrasound

Strong Structural Controllability Based on Leader-Follower Framework

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Journal of Systems Science & Complexity 2023年第4期36卷 1498-1518页

作者： QI Wei JI Zhijian LIU Yungang lin chong Insitute of Complexity Science College of AutomationQingdao UniversityQingdao 266071China Shandong Key Laboratory of Industrial Control Technology Qingdao UniversityQingdao 266071China School of Control Science and Engineering Shandong UniversityJinan 250061China

In this paper,the strong structural controllability of the leader-follower framework is ***,the authors analyze different edge augmentation methods to preserve the strong structural controllability of the path-bud *** following four cases are considered:Adding edges from the path to the bud;adding edges from the bud to the path;adding the reverse or forward edges to the path or bud;and adding both the reverse and forward edges to the path or *** sufficient conditions are derived for the strong structural controllability of the new topologies which are generated by adding different *** addition,it is proved that rank[A B]=n is a necessary condition for the strong structural ***,three examples are given to verify the effectiveness of the main results.

关键词： Edge augmentation leader-follower framework path-bud topology strong structural controllability

Controllability of General linear Discrete Multi-Agent Systems with Directed and Weighted Signed Network

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Journal of Systems Science & Complexity 2022年第6期35卷 2107-2130页

作者： ZHAO Lanhao JI Zhijian LIU Yungang lin chong Institute of Complexity Science College of AutomationQingdao UniversityQingdao 266071China Shandong Key Laboratory of Industrial Control Technology Qingdao UniversityQingdao 266071China School of Control Science and Engineering Shandong UniversityJinan 250061China Institute of Complecity Science College of AutomationQingdao UniversityQingdao 266071China

This paper investigates the controllability of general linear discrete-time multi-agent systems with directed and weighted signed networks by using graphic and algebraic *** nondelay and delay cases are considered *** the case of no time delay,the upper bound condition of the controllable subspace is given by using the equitable partition method,and the influence of coefficient matrix selection of individual dynamics is *** the case of single delay and multiple delays,the equitable partition method is extended to deal with time-delay systems,and some conclusions are *** particular,some simplified algebraic criteria for controllability of systems with time delay are obtained by using augmented system method and traditional algebraic controllability criteria.

关键词： Controllability equitable partition multi-agent system signed network time-delays

A Semi-Looped-Functional for Stability Analysis of Sampled-Data Systems

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IEEE/CAA Journal of Automatica Sinica 2023年第5期10卷 1332-1335页

作者： Zhaoliang Sheng chong lin Shengyuan Xu the Institute of Complexity Science Shandong Key Laboratory of Industrial Control Technologythe School of AutomationQingdao UniversityQingdao 266071 the School of Automation Nanjing University of Science and TechnologyNanjing 210094China

Dear Editor, In recent decades, owing to the significance of sampled-data control way on reducing the burden of communication transmission and improving the control capability of networked control systems, the researc... 详细信息

关键词： network communication Functional

Approximation-based adaptive fuzzy control for a class of non-strict-feedback stochastic nonlinear systems

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Science China(Information Sciences) 2014年第3期57卷 233-248页

作者： WANG HuanQing CHEN Bing lin chong School of Mathematics and Physics Bohai University Institute of Complexity Science Qingdao University

This paper considers the problem of adaptive fuzzy control of a class of single-input/single-output(SISO)nonlinear stochastic systems in non-strict-feedback *** logic systems are used to approximate the uncertain nonlinearities and backstepping technique is utilized to construct an adaptive fuzzy *** proposed controller guarantees that all the signals in the resulting closed-loop system are bounded in *** main contribution of this note lies in providing a control strategy for a class of nonlinear systems in non-strict-feedback *** result is used to test the efectiveness of the suggested approach.

关键词： stochastic nonlinear systems in non-strict-feedback form adaptive control fuzzy control back-stepping approach

Effects of high-pressure rheo-squeeze casting on the Fe-rich phases and mechanical properties of Al-17Si-(1,1.5)Fe alloys

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International Journal of Minerals,Metallurgy and Materials 2018年第9期25卷 1018-1026页

作者： chong lin Shu-sen Wu Shu-lin Lü Ping An He-bao Wu State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Hubei Provincial Key Laboratory of Chemical Equipment Intensification and Intrinsic Safety Wuhan Institute of Technology

The effects of high pressure rheo-squeeze casting(HPRC) on the Fe-rich phases(FRPs) and mechanical properties of Al-17 Si-(1,1.5)Fe alloys were investigated. The alloy melts were first treated by ultrasonic vibration(UV) and then formed by high-pressure squeeze casting(HPSC). The FRPs in the as-cast HPSC Al-17 Si-1 Fe alloys only contained a long, needle-shaped β-Al5 Fe Si phase at 0 MPa. In addition to the β-Al5 Fe Si phase, the HPSC Al-17 Si-1.5 Fe alloy also contained the plate-shaped δ-Al4 Fe Si2 phase. A fine, block-shaped δ-Al4 Fe Si2 phase was formed in the Al-17 Si-1 Fe alloy treated by UV. The size of FRPs decreased with increasing pressure. After UV treatment, solidification under pressure led to further refinement of the FRPs. Considering alloy samples of the same composition, the ultimate tensile strength(UTS) of the HPRC samples was higher than that of the HPSC samples, and the UTS increased with increasing pressure. The UTS of the Al-17 Si-1 Fe alloy formed by HPSC exceeded that of the Al-17 Si-1.5 Fe alloy formed in the same manner under the same pressure. Conversely, the UTS of the Al-17 Si-1 Fe alloy formed by HPRC decreased to a value lower than that of the Al-17 Si-1.5 Fe alloy formed in the same manner.

关键词： high pressure rheo-squeeze casting Al-17Si-(1,1.5)Fe alloys Fe-rich phases mechanical properties

Irrational-Behavior-Proof Conditions for Stochastic Games over Event Trees

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Journal of the Operations Research Society of China 2024年第1期12卷 243-263页

作者： Lei Wang Cui Liu Hong-Wei Gao chong lin School of Automation Institute of Complexity ScienceQingdao UniversityQingdao 266071ShandongChina School of Mathematics and Statistics Institute of Applied Mathematics of ShandongQingdao UniversityQingdao 266071ShandongChina

In this paper,the irrational-behavior-proof conditions in a class of stochastic dynamic games over event trees are *** kinds of irrational-behavior-proof conditions are proposed by the imputation distribution procedure,and their relationships are *** specific properties for the general transformation of characteristic functions are developed,based on which,the irrational-behavior-proof conditions are proved to be true in a transformed cooperative game.

关键词： Dynamic cooperative game Event tree Irrational-behavior-proof condition Imputation distribution procedure Transformation of characteristic function

Comparison between open phase fault of arc suppression coil and single phase to earth fault in coal mine distribution network

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Journal of China University of Mining and Technology 2008年第3期18卷 368-372页

作者： LI Xiao-bo WANG chong-lin School of Information ＆ Electrical Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

When, in a coal mine distribution network whose neutral point is grounded by an arc suppression coil (ASC), a fault occurs in the ASC, compensation cannot be properly realized. Furthermore, it can damage the safe and reliable run of the network. We first introduce a three-phase five-column arc suppression coil (TPFCASC) and discuss its autotracking compensation theory. Then we compare the single phase to ground fault of the coal mine distribution network with an open phase fault at the TPFCASC using the Thévenin theory, the symmetrical-component method and the complex sequence network respectively. The results show that, in both types of faults, zero-sequence voltage of the network will appear and the maximum magnitude of this zero-sequence voltage is different in both faults. Based on this situation, a protection for the open phase fault at the TPFCASC should be estab-lished.

关键词： open phase protection single phase to ground fault three-phase five-column arc suppression coil (TPFCASC)

Necessary and sufficient conditions for the dynamic output feedback stabilization of fractional-order systems with order 0 < α < 1

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Science China(Information Sciences) 2019年第9期62卷 205-207页

作者： Ying GUO chong lin Bing CHEN Qingguo WANG Institute of Complexity Science Qingdao University School of Mathematics and Statistics Zaozhuang University Institute for Intelligent Systems Faculty of Engineering and the Built EnvironmentUniversity of Johannesburg

Dear editor,Fractional calculus is the generalization of integer order calculus that enables us to obtain a considerably accurate description of several real world systems because of its memory property and practical applications. The fractional-order systems(FOS) have attracted significant attention in recent years and have yielded several valuable results, especially with respect to stability and sta-

关键词： FOS Necessary and sufficient conditions for the dynamic output feedback stabilization of fractional-order systems with order 0

Approximation-based direct adaptive tracking control for a class of uncertain pure-feedback stochastic nonlinear systems

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Approximation-based direct adaptive tracking control for a c...