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第三十八届中国控制会议

作者： Wei Jiang Ting Li Zhenhua Zhao Department of Electronic Information Wuxi Vocational Institute of Arts & Technology the School of Automation Southeast University Key Laboratory of Measurement and Control of CSE Ministry of Education College of Automation Engineering Nanjing University of Aeronautics and Astronautics

The problem of event-triggered control for a class of second-order uncertain nonlinear systems subject to p-norm is investigated in this paper. A novel in this paper is that the input-to-state stability(ISS) assumption is removed. By adding a power integrator technique, we design a virtual control signal to address the uncertainties and nonlinearities of nonlinear *** rigorous stability analysis, all the signals of the closed-loop system are proven to be globally uniformly bounded and can converge to an arbitrarily small set which can be be adjusted by one parameter. A numerical example demonstrates the effectiveness of the designed scheme.

关键词： Event-triggered control uncertain nonlinear systems p-norm adding a power integrator technique

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Predefined-time terminal sliding mode control of robot manipulators

arXiv

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arXiv 2020年

作者： Liang, Chang-Duo Ge, Ming-Feng Liu, Zhi-Wei Wang, Yan-Wu Karimi, Hamid Reza School of Mechanical Engineering and Electronic Information China University of Geosciences Wuhan430074 China School of Artificial Intelligence and Automation Huazhong University of Science and Technology Wuhan430074 China Key Laboratory of Image Processing and Intelligent Control Ministry of Education Huazhong University of Science and Technology Wuhan430074 China Department of Mechanical Engineering Politecnico di Milano Milan20156 Italy

In this paper, we present a new terminal sliding mode control to achieve predefined-time stability of robot manipulators. The proposed control is developed based on a novel predefined-time terminal sliding mode (PTSM) surface, on which the states are forced to reach the origin in a predefined time, i.e., the settling time is independent to the initial condition and can be explicitly user-defined via adjusting some specific parameters called the predefined-time parameters. It is also demonstrated that the proposed control can provide satisfactory steady-state performance in the case of both external disturbances and parametric uncertainties. Besides, we present a formal systemic analysis method to derive the sufficient conditions for guaranteeing the predefined-time convergence of the closed-loop system. Finally, the effectiveness and performance of the presented control scheme are illustrated through both theoretical comparisons and numerical simulations. Copyright © 2020, The Authors. All rights reserved.

关键词： Sliding mode control

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Effect of long-term fluorination on surface electrical performance of ethylene propylene rubber

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High Voltage 2019年第4期4卷 339-344页

作者： Rujia Men Zhipeng Lei Tao Han Davide Fabiani Chuanyang Li Simone Vincenzo Suraci Jian Wang Shanxi Key Laboratory of Mining Electrical Equipment and Intelligent Control College of Electrical and Power EngineeringTaiyuan University of TechnologyTaiyuan 030024People's Republic of China Department of Electrical Electronicand Information Engineering‘Guglielmo Marconi’University of BolognaViale Risorgimento 2Bologna 40136Italy Key Laboratory of Smart Grid of Education Ministry School of Electrical and Information Engineering Tianjin UniversityTianjin 300072People's Republic of China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityChangping DistrictBeijing 102206People's Republic of China

To investigate the effect of fluorination on surface electrical performance of ethylene propylene rubber(EPR),four pieces of EPR specimens are prepared and fluorinated for different duration ranging from 120 min to 480 *** surface morphology and element compositions of experimental specimens are *** surface potential decay and complex permittivity are *** tracking discharge property and the erosion properties after tracking test are *** surface charge transport and electrical property tailoring mechanism are *** results show that when the fluorination duration is from 120 min to 360 min,the surface morphology gradually becomes flat and compact with time,and the surface resistance to electrical tracking is *** an excessive fluorination with the duration of 480 min leads to a significant increase in surface conductivity and a weakening in the resistance to electrical tracking,which is mainly due to a change in surface *** recommended fluorination duration for an optimised surface property is between 240 and 360 min for EPR specimen.

关键词： electrical propylene rubber

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Research on a New Hysteresis control Technology for Flexible High-voltage Direct Current Transmission

Research on a New Hysteresis Control Technology for Flexible...

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2018 3rd International Conference on Computer Science and Information engineering(ICCSIE 2018)

作者： Dian Zhang Qingliang Qin Bo Wang College of Automation & Electronic Engineering Qingdao University of Science & Technology Engineering Department China National Automation Control System Corp.

The nearest level approximation control algorithm(nlm) is employed for multi-level multi-module(mmc) in the flexible high-voltage direct current(hdvc) *** decimal part of this algorithm needs to input sine digital pulse width modulator(dpwm),however,since the dpwmis too sensitive and less stable,the output digital pulse becomes too narrow and the digital signal frequency changes too *** order to solve the multilevel problems of the inverter frequency operation,the hysteretic Schmidt comparison method is proposed to meet the requirement of *** method can not only ensure the stability of the output digital signal,but also can adjust the hysteretic Schmidt trigger threshold,obtain more ideal digital pulse width which reduces the digital signal output frequency and make digital output signals stable and the pulse width,the grading sorting algorithm and guarantee the reduction of the output control pulse *** feasibility of the method is verified through simulation and the actual running results of this method in field-programmable gate array(fpga) show that the study of nlm control algorithm can optimize the flexible hvdc control requirements.

关键词： high-voltage direct current hysteresis control triangular carrier wave

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OpenHI2 – Open source histopathological image platform

arXiv

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arXiv 2020年

作者： Puttapirat, Pargorn Zhang, Haichuan Deng, Jingyi Dong, Yuxin Shi, Jiangbo He, Hongyu Gao, Zeyu Wang, Chunbao Zhang, Xiangrong Li, Chen Shaanxi Province Key Laboratory of Satellite and Terrestrial Network Tech R&D Xi'an Jiaotong University Xi'an Shaanxi710049 China School of Electronic and Information Engineering Xi'an Jiaotong University Xi'an Shaanxi710049 China Department of Software Engineering Xi’an Jiaotong University Xi’an Shaanxi710049 China Department of Power System and Automation School of Electrical Engineering Xi’an Jiaotong University Xi’an Shaanxi710049 China Department of Pathology First Affiliated Hospital of Xi’an Jiaotong University Xi'an Shaanxi710061 China

— Transition from conventional to digital pathology requires a new category of biomedical informatic infrastructure which could facilitate delicate pathological routine. Pathological diagnoses are sensitive to many external factors and is known to be subjective. Only systems that can meet strict requirements in pathology would be able to run along pathological routines and eventually digitized the study area, and the developed platform should comply with existing pathological routines and international standards. Currently, there are a number of available software tools which can perform histopathological tasks including virtual slide viewing, annotating, and basic image analysis, however, none of them can serve as a digital platform for pathology. Here we describe OpenHI2, an enhanced version Open Histopathological Image platform which is capable of supporting all basic pathological tasks and file formats;ready to be deployed in medical institutions on a standard server environment or cloud computing infrastructure. In this paper, we also describe the development decisions for the platform and propose solutions to overcome technical challenges so that OpenHI2 could be used as a platform for histopathological images. Further addition can be made to the platform since each component is modularized and fully documented. OpenHI2 is free, open-source, and available at https://***/BioAI/OpenHI. Copyright © 2020, The Authors. All rights reserved.

关键词： Open source software

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Ship Path Planning Based on Improved Particle Swarm Optimization

Ship Path Planning Based on Improved Particle Swarm Optimiza...

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2018 Chinese automation Congress, CAC 2018

作者： Yujie, Liu Yu, Pan Yixin, Su Huajun, Zhang Danhong, Zhang Yong, Song School of Automation Wuhan University of Technology Wuhan China Purchasing Department China Nuclear Control System Engineering Co. LTD. Beijing China

ISBN: (纸本)9781728113128

This paper deeply analyzes and studies the ship path planning problem. An improved particle swarm optimization algorithm named chaos multi-population particle swarm optimization(CMPSO) is designed for ship path planning. Firstly, the marine environment model is established based on the link graph method, and the Dijkstra algorithm is used to plan the initial path;Secondly, the improved particle swarm algorithm is used for path planning, a multi-population mechanism is established to balance the population's global search ability and local search ability;Finally, simulate the initial path planning and global static path planning. The results show that the proposed algorithm has better performance than path planning algorithm based on linearly decreasing weight particle swarm optimization(LDW-PSO). © 2018 IEEE.

关键词： Chaos theory

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Digital Quadruplets for Cyber-Physical-Social systems based Parallel Driving: From Concept to Applications

arXiv

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arXiv 2020年

作者： Liu, Teng Yang, Xing Wang, Hong Tang, Xiaolin Chen, Long Yu, Huilong Wang, Fei-Yue State Key Laboratory of Mechanical Transmissions College of Automotive Engineering Chongqing University Chongqing400044 China Department of Mechanical and Aerospace Engineering Nanyang Technological University Singapore School of Vehicle and Mobility Tsinghua University Beijing China Waytous Inc. Qingdao Shandong266109 China Department of Mechanical and Mechatronics Engineering University of Waterloo N2L 3G1 Canada State Key Laboratory for Management and Control of Complex System Institute of Automation Beijing China

Digital quadruplets aiming to improve road safety, traffic efficiency and driving cooperation for future connected automated vehicles are proposed with the enlightenment of ACP based parallel driving. The ACP method denotes Artificial societies, Computational experiments and Parallel execution modules for cyber-physical-social systems. Four agents are designed in the framework of digital quadruplets: descriptive vehicles, predictive vehicles, prescriptive vehicles and real vehicles. The three virtual vehicles (descriptive, predictive, and prescriptive) dynamically interact with the real one in order to enhance the safety and performance of the real vehicle. The details of the three virtual vehicles in the digital quadruplets are described. Then, the interactions between the virtual and real vehicles are presented. The experimental results of the digital quadruplets demonstrate the effectiveness of the proposed framework. Copyright © 2020, The Authors. All rights reserved.

关键词： Vehicles

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Joint beamformer design for wireless fronthaul and access links in C-RANs

Joint beamformer design for wireless fronthaul and access li...

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作者： Hu, Bin Hua, Cunqing Chen, Cailian Guan, Xinping Department of Automation School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai200240 China Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai200240 China School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai200240 China

This paper presents a joint design framework of fronthaul and access links in cloud radio access networks, wherein the fronthaul data delivery between the central processor (CP) and small-cell base stations (SBSs) is carried over wireless links, which is more cost effective and flexible than the conventional wired fronthaul solutions. In this framework, the coordinated beamforming scheme is adopted by the SBSs to serve the users cooperatively, which not only reduces the bandwidth requirement over the fronthaul links, but also eliminates the inter-cell interference in the access links. To further exploit the spatial diversity over the fronthaul links, the multi-user beamforming scheme is adopted by the CP to deliver the data of all users to their serving SBSs simultaneously. This non-convex and combinatorial optimization problem is reformulated to a unified beamformer design problem using the $\ell -{0}/\ell -{1}$ -norm framework, which is still difficult to obtain the optimal solutions. Therefore, we first propose an algorithm based on the difference of convex (DC) programming scheme to find the suboptimal solutions, whereby the formulated problem is transformed to the standard DC programming problem and solved iteratively using the convex-concave procedure algorithm. We then propose another algorithm based on the successive convex approximation and weighted minimum-mean-squared-error approaches, and solve the transformed problem using the block coordinate update scheme. The pros and cons of these two algorithms are discussed, and simulation results are provided to demonstrate the performance gain of our schemes over other benchmark schemes. © 2018 IEEE.

关键词： Beamforming

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Comparation of Aroma-Active Compounds in Fresh Commercial Infant Formula and the Change during Ambient Storage

引用

Journal of Future Foods 2025年

作者： Lirong Xu Ailing Tian Jiayi Su Meifan Pan Riqing Liu Peipei Gao Beilei Pang Zitong Liu Lijiao Fan Huaixia Zhang Yali Wang Lei Du Lili Zheng Yingchun Zhao Xiaoxiao Feng Jing Lv Department of Nutrition The Affiliated Hospital of Qingdao University Qingdao China Institute of Nutrition and Health Qingdao University 266071 Qingdao China Department of Gastrointestinal Surgery The Affiliated Hospital of Qingdao University Jiangsu Road 16# Qingdao Shandong 266400 People's Republic of China Department of Health Education and Management and the Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment School of Public Health Fourth Military Medical University Xi'an China. Department of surgery The Affiliated Hospital of Qingdao University Qingdao China National Engineering Research Centre for Intelligent Electrical Vehicle Power System (Qingdao) College of Mechanical & Electronic Engineering Qingdao University Qingdao 266071 China College of Chemical Engineering Qingdao University of Science and Technology Analysis and Testing Center Qingdao University of Science and Technology 266042 Qingdao China Department of Food Science & Technology School of Agriculture & Biology Shanghai Jiao Tong University Shanghai 200240 China

This study compared the aroma-active compounds in 14 brands of commercially infant formula and investigated their changes during ambient storage after opening for 2 months. A total of 29 major aroma-active compounds were detected in infant formula. From the PCA and heatmap analysis, a total of 14 brands of infant formula were classified into 3 groups, the second group contained JLB-Y, AY and FH-F, of which 2-furanmethanol and (E,E)-3,5-octadien-2-one were mainly compounds, the third group contained YL and JLB-L, the characteristic flavor compounds in this group were mainly hexanal, heptanal, etc. Aldehydes, as the main volatile substances, account for more than half of the total volatiles. Nearly half of the aldehydes showed more significant changes after storage, e.g. hexanal, octanal, (E)-2-octenal and 3-methylbutyraldehyde. The YL and YP-Q produced more saturated aldehydes after storage, the concentration of hexanal in YL-2m and YP-Q-2m was 2138.5 μg/kg and 2004.1μg/kg, respectively. The concentrations of heptanal, octanal, and nonanal also increased relatively significantly, which may lead to a distinct rancid flavor in YL and YP-Q. Besides, among the ketones, (E,E)-3,5-octadien-2-one showed the greatest change after storage, especially in JLB-L. According to sensory evaluation experiments, the milky flavor of infant formulas decreased and fatty, rancid, fishy and grassy flavors were found to have increased to different extents after storage. The current information gap on the concentration and evolution of volatile compounds in commercially available infant formula is filled by this study.

关键词： Infant formula Volatile compounds GC-MS Ambient Storage

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Exact Computation of Delay Margin by PID control: It Suffices to Solve a Unimodal Problem!

Exact Computation of Delay Margin by PID Control: It Suffice...

引用

第三十八届中国控制会议

作者： Jianqi Chen Dan Ma Yong Xu Jie Chen Department of Electronic Engineering City University of Hong Kong College of Information Science and Engineering State Key Laboratory of Synthetical Automation for Process Industries Northeastern University The School of Automation Guangdong Provincial Key Laboratory of Intelligent Decision and Cooperative Control Guangdong University of Technology

In this paper we study delay robustness of PID controllers in stabilizing systems containing uncertain, variable *** consider second-order unstable systems and seek analytical characterization and exact computation of the PID delay margin,where by PID delay margin we mean the maximal range of delay values within which the system can be robustly stabilized by a PID controller. Our contribution is threefold. First, we show that the delay margin achieved by PID control coincides with that by PD controllers. Second, we show that other than helping stabilize the delay-free part of a plant, the proportional control contributes no action to increase the delay margin. Finally, we show that the PID delay margin can be computed efficiently by solving a unimodal problem, that is, a univariate optimization problem that admits a unique maximum and hence is a convex optimization problem in one variable. This unimodal problem is one of pseudo-concave optimization and hence can be solved using standard convex optimization or gradient-based methods. As such, from a computational perspective, the PID delay margin problem is completely resolved in this paper! The results not only insure that the PID delay margin problem be readily solvable, but also provide fundamental conceptual insights into the PID control of delay systems, and analytical justifications to long-held engineering intuitions and heuristics, thus lending useful guidelines in the tuning and analytical design of PID controllers.

关键词： Delay margin robust stabilization PID controller uncertain time delay nonlinear programming pseudo-concavity

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