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Designing Proportional-Integral Consensus Protocols for Second-Order Multi-Agent Systems Using Delayed and Memorized State Information

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IEEE/CAA Journal of Automatica Sinica 2024年第4期11卷 878-892页

作者： honghai Wang Qing-Long Han the College of Information Science and Engineering State Key Laboratory of Synthetical Automation for Process IndustriesNortheastern UniversityShenyang 110819China the School of Science Computing and Engineering TechnologiesSwinburne University of TechnologyMelbourneVIC 3122Australia

This paper is concerned with consensus of a secondorder linear time-invariant multi-agent system in the situation that there exists a communication delay among the agents in the network.A proportional-integral consensus protocol is designed by using delayed and memorized state *** the proportional-integral consensus protocol,the consensus problem of the multi-agent system is transformed into the problem of asymptotic stability of the corresponding linear time-invariant time-delay *** that the location of the eigenvalues of the corresponding characteristic function of the linear time-invariant time-delay system not only determines the stability of the system,but also plays a critical role in the dynamic performance of the *** this paper,based on recent results on the distribution of roots of quasi-polynomials,several necessary conditions for Hurwitz stability for a class of quasi-polynomials are first *** allowable regions of consensus protocol parameters are *** necessary and sufficient conditions for determining effective protocol parameters are *** designed protocol can achieve consensus and improve the dynamic performance of the second-order multi-agent ***,the effects of delays on consensus of systems of harmonic oscillators/double integrators under proportional-integral consensus protocols are ***,some results on proportional-integral consensus are derived for a class of high-order linear time-invariant multi-agent systems.

关键词： Consensus protocol Hurwitz stability multi-agent systems quasi-polynomials time delay

Pressure distributions on prism-shaped buildings in experimentally simulated downburst

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Science China(Technological Sciences) 2014年第10期57卷 2070-2081页

作者： LI honghai OU JinPing School of Civil Engineering Harbin Institute of Technology

Wind loading is one of the most significant factors in civil engineering that influences the structural design *** this paper,a group of manufacturing equipments for downburst simulation based on impinging jet model was developed for investigating the wind loads on structures:including the centrifugal air bellows to generate airflow,a movable platform to realize multiple locations of the building and a freely rotatable turntable to implement alterable building *** of transducers were used to measure the wind action on all surfaces of the *** pressure coefficients calculated from the observed data were utilized to evaluate the downburst wind *** distributions on three prism-shaped building models with different placements and angles were investigated to obtain the maximum wind action and mean pressure *** results showed that the maximum pressure coefficient would reach 1.0 on the top surface if the downburst just broke out over the *** that the building was in the developing field of the downburst,the top and the front surfaces would be under high wind pressure and only the back surface would endure wind *** the downdraft happens away from the prismatic building,all surfaces,except the front surface,would subject to suction with different *** was also found that the pressure coefficient on the right surface would get its negative peak at first and then go straight up to 0.6 as the angle changed from 0°to 45°and the wind pressure on the front surface would decrease slightly through the whole *** assertive results provide elemental data for structural wind-resistant design in civil engineering for the downburst-prone areas.

关键词： wind loading downburst pressure coefficient building structure impinging jet model

Hermitian Adjacency Spectrum of Cayley Digraphs over Dihedral Group

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Algebra Colloquium 2020年第1期27卷 121-130页

作者： honghai Li Teng Yu College of Mathematics and Information Science Jiangxi Normal University Nanchang 330022China

We first study the spectrum of Hermitian adjacency matrix(H-spectrum)of Cayley digraphs X(D 2n,S)on dihedral group D2n with|S|=*** we show that all Cayley digraphs X(D2P,S)with|S|=3 and p odd prime are Cay-DS,namely,f... 详细信息

关键词： digraph dihedral group Hermitian adjacency matrix Cay-DS 3-DCI property

The Distribution of Zeros of Quasi-Polynomials

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IEEE/CAA Journal of Automatica Sinica 2023年第2期10卷 301-304页

作者： honghai Wang Qing-Long Han the College of Information Science and Engineering Northeastern UniversityShenyang 110004China IEEE the School of Science Computing and Engineering TechnologiesSwinburne University of TechnologyMelbourneVIC 3122Australia

PROFESSOR Yitang Zhang, a number theorist at the University of California, Santa Barbara, USA, has posted a paper on arXiv [1] that hints at the possibility that he may have solved the Landau-Siegel zeros conjecture. He has claimed that he has disproved a weaker version of the Landau-Siegel zeroes conjecture, an important problem related to the *** conjecture is that there are solutions to the zeta function that do not assume the form prescribed by the Riemann hypothesis. Inspired by his work, in this Perspective, we would like to discuss about the distribution of zeros of quasi-polynomials for linear time-invariant(LTI) systems with time delays.

关键词： conjecture assume invariant

An Efficient Method for Estimating Capability Curve of Virtual Power Plant

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CSEE Journal of Power and Energy Systems 2022年第3期8卷 780-788页

作者： Zhenfei Tan Haiwang Zhong Xuanyuan Wang honghai Tang Department of Electrical Engineering State Key Laboratory of Power SystemsTsinghua UniversityBeijingChina Power exchange center State Grid Jibei Electric Power Co.LtdBeijingChina Beijing Power Exchange Center BeijingChina

To incorporate the operating constraints of a virtual power plant(VPP)in transmission-level operation and market clearing,the concept of the VPP capability curve(VPP-CC)is proposed which explicitly characterizes the allowable range of active and reactive power outputs of a VPP.A two-step projection-based calculation framework is proposed to approximate the VPP-CC by the convex hull of critical points on its *** output of the proposed algorithm is concise and can be easily incorporated in the existing system operation and market *** studies based on the IEEE 33 and 123 test feeders show the computational efficiency of the proposed method outperforms existing methods by 4~7 ***,many fewer inequalities are needed to depict the VPP-CC while achieving the comparative approximation accuracy compared to sampling-based methods,which will relieve the communication and computation burden.

关键词： Aggregation model capability curve optimal power flow projection algorithm virtual power plant

Constant Speed Control of Four-stroke Micro Internal Combustion Swing Engine

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Chinese Journal of Mechanical Engineering 2015年第5期28卷 971-982页

作者： GAO Dedong LEI Yong ZHU honghai NI Jun State Key Laboratory of Fluid Power Transmission and Control Zhejiang University School of Mechanical Engineering Qinghai University Department of Mechanical Engineering University of Michigan

The increasing demands on safety, emission and fuel consumption require more accurate control models of micro internal combustion swing engine （MICSE）. The objective of this paper is to investigate the constant speed control models of four-stroke MICSE The operation principle of the four-stroke MICSE is presented based on the description of MICSE prototype. A two-level Petri net based hybrid mode/ is proposed to mode/ the four-stroke MICSE engine cycle. The Petri net subsystem at the upper level controls and synchronizes the four Petri net subsystems at the lower level. The continuous sub-models, including breathing dynamics of intake manifold, thermodynamics of the chamber and dynamics of the torque generation, are investigated and integrated with the discrete model in MATLAB Simulink. Through the comparison of experimental data and simulated DC voltage output, it is demonstrated that the hybrid model is valid for the four-stroke MICSE system. A nonlinear model is obtained from the cycle average data via the regression method, and it is linearized around a given nominal equilibrium point for the controller design. The feedback controller of the spark timing and valve duration timing is designed with a sequential loop closing design approach. The simulation of the sequential loop closure control design applied to the hybrid model is implemented in MATLAB. The simulation results show that the system is able to reach its desired operating point within 0.2 s, and the designed controller shows good MICSE engine performance with a constant speed. This paper presents the constant speed control models of four-stroke MICSE and carries out the simulation tests, the models and the simulation results can be used for further study on the precision control of four-stroke MICSE.

关键词： MICSE constant speed control hybrid model spark timing valve duration

Immune cells in alcohol-related liver disease

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Liver Research 2022年第1期6卷 1-9页

作者： honghai Xu Hua Wang Department of Pathology the First Affiliated Hospital of Anhui Medical UniversityHefeiAnhuiChina Department of Oncology the First Affiliated Hospital of Anhui Medical UniversityHefeiAnhuiChina Inflammation and Immune Mediated Diseases Laboratory of Anhui Province Anhui Medical UniversityHefeiAnhuiChina

Alcohol-related liver disease(ALD),which is caused by excessive alcohol consumption,is one of the most common types of liver disease and a primary cause of hepatic injury,with a disease spectrum that in-cludes steatosis,steatohepatitis,fibrosis,cirrhosis,and hepatocellular *** lines of evi-dence have indicated that immune cells play a significant role in the inflammatory processes of *** the one hand,the liver contains various resident immune cells that have been proven to perform different functions in *** example,in the progression of the disease,Kupffer cells(KCs)are activated by lipopolysaccharide-Toll-like receptor 4 signaling and release various proinflammatory ***,alcohol intake has been shown to depress the function of natural killer ***,two types of unconventional T cells(natural killer T cells and mucosal-associated invariant T cells)are involved in the development of *** the other hand,alcohol and many different cytokines stimulate the recruitment and infiltration of circulating immune cells(neutrophils,T cells,macrophages,and mast cells)into the *** neutrophils can produce proinflammatory mediators and cause the dysfunction of anti-infection ***,alcohol intake can change the phenotype of T cells,resulting in their increased production of *** from KCs,infiltrating macrophages have also been observed in patients with ALD,but the roles of all of these cells in the progression of the disease have shown both similarities and ***,the activated mast cells are also associated with the development of ***,we review the diverse roles of the various immune cells in the progression of ALD.

关键词： Alcohol-related liver disease(ALD) Resident immune cells Circulating immune cells Infiltrating immune cells Inflammation Cytokines

A Braille Reading System Based on Electrotactile Display With Flexible Electrode Array

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IEEE/CAA Journal of Automatica Sinica 2022年第4期9卷 735-737页

作者： Ziliang Zhou Yicheng Yang honghai Liu IEEE the State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University the State Key Laboratory of Robotics and Systems Harbin Institute of Technology Shenzhen

Dear editor,Due to visual impairment and lack of social attention,the reading problem of the blind has not been well *** existing Braille reading devices still have many problems and are not accepted by the *** paper developed a portable Braille reading system based on electrotactile display *** proposed system is composed of a six-channel electrotactile stimulator,a flexible electrode array for Braille display and a graphical user interface(GUI)for monitoring and *** on the flexibility of the system,two Braille reading strategies have been designed:spatial mode and sequential *** system was preliminary tested by six sighted *** results showed that subjects were able to recognize Braille characters with more than 80%accuracy within less than 10 seconds for the initial *** to existing Braille reading systems,this system is portable,wearable and flexible in control.

关键词： portable editor Bra

A novel bibliometric and visual analysis of global geoscience research using landscape indices

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Frontiers of Earth Science 2022年第2期16卷 340-351页

作者： Xin AI Mingguo MA Xuemei WANG honghai KUANG Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station School of Geographical SciencesSouthwest UniversityChongqing 400715China Southwest University Library Southwest UniversityChongqing 400715China Chongqing Engineering Research Center for Remote Sensing Big Data Application Southwest UniversityChongqing 400715China

The landscape index is a quantitative index which reflects characteristics of structure composition and spatial pattern in landscape studies,it is,therefore,expected to describe the spatial pattern of scientific research in bibliometric *** this study,a novel attempt to regard scientific research as a kind of‘landscape’was made,and landscape indices were improved for bibliometric analysis to measure the spatial pattern of scientific *** illustrating the feasibility of our method,global geoscience research from 1994 to 2018 was presented as a ***,spatiotemporal migration of landscape centroids was *** results indicated that global geoscience publications increased steadily and articles were highly concentrated at the country *** top 10 countries published 69.93%of total articles and 84.68%of geoscience articles were from top 20 productive *** spatial migration of centroids was mainly reflected in the longitude because of significant increasing of articles in eastern countries,especially in China with the growth rate of 747.14%.At the patch scale,the change trend of improved landscape indices verified the spatiotemporal changes of global distribution of geoscience *** the landscape scale,the strengthening of global international collaboration is the main driving forces of spatial heterogeneity of global geoscience *** study is expected to help readers to understand global trends of geoscience research in the past 25 years,and to promote the development of bibliometric analysis towards the directions of spatialization and visualization.

关键词： geoscience landscape index visualization Geographical Information System bibliometric analysis