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Distributed Adaptive Fault-Tolerant Output Regulation of Heterogeneous Multi-Agent Systems With Coupling Uncertainties and Actuator Faults

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IEEE/CAA Journal of Automatica Sinica 2020年第4期7卷 1098-1106页

作者： Chao Deng Weinan Gao Weiwei che the School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore the Department of Electrical and Computer Engineering Allen E.Paulson College of Engineering and ComputingGeorgia Southern UniversityStatesboroGA 30460 USA the State Key Laboratory of Industrial Control Technology Institute of Cyber-Systems and ControlZhejiang UniversityHangzhou 310027 the Institute of Complexity Science Qingdao UniversityQingdao 266071China

In this paper, we consider the distributed adaptive fault-tolerant output regulation problem for heterogeneous multiagent systems with matched system uncertainties and mismatched coupling uncertainties among subsystems under the influence of actuator faults. First, distributed finite-time observers are proposed for all subsystems to observe the state of the exosystem. Then, a novel fault-tolerant controller is designed to compensate for the influence of matched system uncertainties and actuator faults. By using the linear matrix inequality technique, a sufficient condition is provided to guarantee the solvability of the considered problem in the presence of mismatched coupling uncertainties. Moreover, it is shown that the system in closed-loop with the developed controller can achieve output regulation by using the Lyapunov stability theory and cyclic-small-gain ***, a numerical example is given to illustrate the effectiveness of the obtained result.

关键词： Adaptive control cyclic-small-gain fault-tolerant control multi-agent systems(MASs)

Effect of adjusted mesoscale drag model on flue gas desulfurization in powder-particle spouted beds

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Frontiers of chemical Science and Engineering 2022年第6期16卷 909-920页

作者： Xinxin che Feng Wu Xiaoxun Ma School of chemical Engineering Northwest UniversityXi'an 710069China

An energy minimum multiscale model was adjusted to simulate the mesoscale structure of the flue gas desulfurization process in a powder-particle spouted bed and verified *** obtained results revealed that the spout morphology simulated by the adjusted mesoscale drag model was unstable and discontinuous bubbling spout unlike the stable continuous spout obtained using the Gidaspow *** addition,more thorough gas radial mixing was achieved using the adjusted mesoscale drag *** mass fraction of water in the gas mixture at the outlet determined by the heterogeneous drag model was 1.5 times higher than that obtained by the homogeneous drag model during the simulation of water *** the desulfurization reaction,the experimental desulfurization efficiency was 75.03%,while the desulfurization efficiencies obtained by the Gidaspow and adjusted mesoscale drag models were 47.63%and 75.08%,respectively,indicating much higher accuracy of the latter technique.

关键词： adjusted mesoscale drag model particle image velocimetry water vaporization desulfurization reaction numerical simulation

A geostrophic empirical mode based on altimetric sea surface height

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Science China Earth Sciences 2012年第7期55卷 1193-1205页

作者： ZHANG Lin SUN che Institute of Oceanology Chinese Academy of SciencesQingdao 266071China

Recent discovery of low-dimensional coherent structure in oceanic currents along with a new merged altimeter product called Absolute Dynamic Topography (ADT) makes it possible to derive subsurface ocean information from satellite remote sensing *** altimetric geostrophic empirical mode (η-GEM) is developed in this study by projecting hydrographic transects onto the ADT sea surface height coordinate,based on which the four-dimensional thermohaline and velocity structures of oceanic currents are reconstructed from satellite surface *** the WOCE/SR3 area,the η-GEM fields capture more than 95% of the total thermal *** GEM-derived flow has equivalent-barotropic structure and represents the velocity profile better than traditional dynamic *** with mooring observations also demonstrates that the η-GEM provides good estimates of the deep thermohaline fields.

关键词： η-GEM altimetry SSH

Asymptotic behavior for log-determinants of several non-Hermitian random matrices

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Frontiers of Mathematics in China 2017年第4期12卷 805-819页

作者： Lei che~ Shaochen WANG School of Mathematics and Statistics Jiangsu Normal University Xuzhou 221116 China School of Mathematics South China University of Technology Guangzhou 510640 China

We study the asymptotic behavior for log-determinants of two unitary but non-Hermitian random matrices： the spherical ensembles A-1B, where A and B are independent complex Ginibre ensembles and the truncation of circular unitary ensembles. The corresponding Berry-Esseen bounds and Cram6r type moderate deviations are established. Our method is based on the estimates of corresponding cumulants. Numerical simulations are also presented to illustrate the theoretical results.

关键词： Log-determinants Berry-Esseen bounds moderate deviations,spherical ensembles circular unitary ensembles

Testing protocols in Internet of Things by a formal passive technique

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Science China(Information Sciences) 2014年第3期57卷 6-18页

作者： Xiaoping che Stephane MAAG Insititut Mines-Telecom/Telecom SudParis CNRS UMR 5157Evry 91000France

In recent years,Extensible Messaging and Presence Protocol(XMPP)is gaining momentum in Internet of Things(IoT).It has been widely used in chatting,message exchanging and unique *** a matter of course,it raises an interesting issue:how to formally test the conformance and performance of XMPP in IoT *** conformance testing of communicating protocols is a functional test that verifies whether the behaviors of the protocol satisfy defined requirements,performance testing is a qualitative and quantitative test that aims at checking whether the performance requirements of the protocol are satisfied under certain *** this paper,we present a logic-based passive testing approach that can test both the conformance and the performance of XMPP protocol through real execution traces and formally specified *** evaluate and assess our methodology,we present a developed prototype and the experiments with a set of XMPP ***,the relevant verdicts and conclusions are provided.

关键词： Internet of Things passive testing formal methods XMPP

Highly Efficient Quasi-Homogeneous System for Photocatalytic H_(2)O_(2)Production

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Chinese Journal of Structural chemistry 2022年第5期41卷 93-94页

作者： Huinan che Yanhui Ao Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry of EducationCollege of EnvironmentHohai UniversityNanjing 210098China

The quasi-homogeneous photocatalytic system can be formed by iodide ions induced fragmented and ultrathin structured *** TP-PCN possesses abundant edge active sites,which can greatly enhance the O_(2)adsorption/activation capacity and the 2e-ORR *** expected,the quasi-homogeneous system affords a remarkably increased photocatalytic H_(2)O_(2)production activity.

关键词： system Highly adsorption

Evaluation on the state of sand filling layer and the influence on segment deformation of immersed tunnels

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Underground Space 2024年第3期16卷 224-238页

作者： Ziyao Xu Ailan che Chao Su School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China CCCC Second Harbor Engineering Company Ltd. Wuhan 430040China

The immersed tunnel is considered an effective solution for traffic problems across rivers and *** sand filling layer,as an important part of immersed tunnel foundation treatments,directly affects segment attitude *** to difficulties in quality control of concealed construction and the complex hydrodynamic environment,the sand filling layer is prone to compaction defects,further leading to changes in segment ***,limited by structural concealment and state complexity,most studies consider the sand filling layer part of the foundation to study its impact on settlement while neglecting its influence on segment *** research proposes an evaluation method for the sand filling layer state based on elastic wave testing and the elastic wave characteristic parameters selected come from analysis of the time domain,frequency domain and time–frequency *** classifying the elastic wave characteristic parameters through the K-means clustering method,the relationship between the state of the sand filling layer and the elastic wave characteristic parameters is *** state of the sand filling layer is divided into dense,incompact,and void.A numerical model is established based on the Guangzhou BI-UT immersed tunnel with incompact and void sand filling layer states to simulate deformation and *** results indicate that the settlement of the tunnel segment is low in the eastern region and high in the western region due to the presence of a less dense sand filling layer,with a maximum differential settlement of 0.04 *** evaluation method plays a crucial role in guiding the construction of immersed tube tunnels.

关键词： Sand filling layer state Immersed tunnel Elastic wave test Clustering algorithm

Arsenate biotransformation by Microcystis aeruginosa under different nitrogen and phosphorus levels

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Journal of Environmental Sciences 2018年第4期30卷 41-49页

作者： Feifei che Miaomiao Du Changzhou Yan Key Laboratory of Urban Environment and Health Institute of Urban Environment Chinese Academy of Sciences

The arsenate（As（V）） biotransformation by Microcystis aeruginosa in a medium with different concentrations of nitrogen（N） and phosphorus（P） has been studied under laboratory conditions. When 15 μg/L As（V） was added, N and P in the medium showed effective regulation on arsenic（As） metabolism in M. aeruginosa, resulting in significant differences in the algal growth among different N and P treatments. Under 0.2 mg/L P treatment, increases in N concentration（4–20 mg/L） significantly stimulated the cell growth and therefore indirectly enhanced the production of dimethylarsinic acid（DMA）, the main As metabolite, accounting for 71%–79% of the total As in the medium. Meanwhile, 10–20 mg/L N treatments accelerated the ability of As metabolization by M. aeruginosa, leading to higher contents of DMA per ***, As（V） uptake by M. aeruginosa was significantly impeded by 0.5–1.0 mg/L P treatment,resulting in smaller rates of As transformation in M. aeruginosa as well as lower contents of As metabolites in the medium. Our data demonstrated that As（V） transformation by M. aeruginosa was significantly accelerated by increasing N levels, while it was inhibited by increasing P levels. Overall, both P and N play key roles in As（V） biotransformation processes.

关键词： Arsenate Biotransformation Nitrogen Phosphorus M.aeruginosa

Signal difference-based deadband H_∞ control approach for networked control systems with limited resources

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Journal of Systems Engineering and Electronics 2015年第3期26卷 573-583页

作者： Yingying Liu Weiwei che Yunkai Chu School of Information Engineering Shenyang University Key Laboratory of Manufacturing Industrial Integrated Automation Shenyang University Shenyang Institute of Automation Chinese Academy of Sciences

This paper investigates a signal difference-based dead- band H∞ control approach for networked control systems （NCSs） with limited resources. The effects of variable network-induced de- lays, sampling intervals and data transmitting deadbands are con- sidered simultaneously and the model of the NCS is presented. A Lyapunov functional is adopted, which makes full use of the network characteristic information including the bounds of net- work delay （BND）, the bounds of sampling interval （BSI） and the bounds of transmission deadband （BTD）. In the meanwhile, the new H∞ performance analysis and controller design conditions for the NCSs are proposed, which describe the relationship of BND, BSI, BTD and the system＇s performance. Three examples are used to illustrate the advantages of the proposed methods. The results have shown that the proposed method not only effectively reduces the data traffic, but also guarantees the system asymptotically sta- ble and achieves the prescribed H∞ disturbance attenuation level.

关键词： networked control system (NCS) H∞ control vari-able network-induced delay variable sampling interval transmission deadband.