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Summary of PID control System of Liquid Level of a Single-Capacity Tank

Journal of Physics: Conference Series 2021年第2期1865卷

作者： Pei Jiang Department of Automation School of Control and Computer Engineering North China Electric Power University Baoding City Heibei Province 071003 China. The instructor: Jie Su.

Liquid level is one of the control parameters widely used in industrial production. Accurate control of liquid level bears on the quality, efficiency and market of products, as well as the effect and safety of production. Therefore, the research on liquid level control has practical significance and broad application prospects. In view of this, this article firstly briefly analyzes the characteristics of the single-tank water tank level system, and then focuses on the realization of classical, fuzzy and neural network PID (Proportion Integral Differential) algorithm for the single-tank water tank level system. Finally, the validity of algorithm is proved by the system real-time simulation curve, which provides a more comprehensive reference for similar control systems.

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Reliable Task Offloading for Vehicular Fog Computing under Information Asymmetry and Information Uncertainty

Reliable Task Offloading for Vehicular Fog Computing under I...

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作者： Zhou, Zhenyu Liao, Haijun Zhao, Xiongwen Ai, Bo Guizani, Mohsen State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Electrical and Electronic Engineering North China Electric Power University Beijing China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing China Department of Computer Science and Engineering Qatar University Doha Qatar

Vehicular fog computing has emerged as a cost-efficient solution for task processing in vehicular networks. However, how to realize effective server recruitment and reliable task offloading under information asymmetry and uncertainty remains a critical challenge. In this paper, we adopt a two-stage task offloading framework to address this challenge. First, we propose a convex-concave-procedure-based contract optimization algorithm for server recruitment, which aims to maximize the expected utility of the operator with asymmetric information. Then, a low-complexity and stable task offloading mechanism is proposed to minimize the total network delay based on the pricing-based matching. Furthermore, we extend the work to the scenario of information uncertainty and develop a matching-learning-based task offloading mechanism, which takes both occurrence awareness and conflict awareness into consideration. Simulation results demonstrate that the proposed algorithm can effectively motivate resource sharing and guarantee bounded deviation from the optimal performance without the global information. © 2019 IEEE.

关键词： Fog computing

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Hybrid Online Multi-Sensor Error Detection and Functional Redundancy for Artificial Pancreas control Systems

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IFAC-PapersOnLine 2018年第18期51卷 138-143页

作者： Feng, Jianyuan Hajizadeh, Iman Samadi, Sediqeh Sevil, Mert Hobbs, Nicole Brandt, Rachel Lazaro, Caterina Maloney, Zacharie Yu, Xia Littlejohn, Elizabeth Quinn, Laurie Cinar, Ali Department of Chemical and Biological Engineering Illinois Institute of Technology ChicagoIL United States Department of Biomedical Engineering Illinois Institute of Technology IL United States Department of Electrical and Computer Engineering Illinois Institute of Technology ChicagoIL United States Department of Control Theory and Control Engineering Northeastern University ShenyangLiaoning China Department of Pediatrics University of Chicago ChicagoIL United States College of Nursing University of Illinois at Chicago ChicagoIL United States

Sensor errors limit the performance of a supervision and control system. Sensor accuracy can be affected by many factors such as extreme working conditions, sensor deterioration and interferences from other devices. It may be difficult to distinguish sensor errors and real dynamic changes in a system. A hybrid online multi-sensor error detection and functional redundancy (HOMSED&FR) algorithm is developed to monitor the performance of multiple sensors and reconcile the erroneous sensor signals. The algorithm relies on two methods, outlier-robust Kalman filter (ORKF) and a locally-weighted partial least squares (LW-PLS) regression model. The two methods have different way of using data, ORKF is comparing current signal samples with the signal trace indicated by previous samples and LW-PLS is comparing samples in the past window with the samples from a database and uses the samples with the most similarity to build a model to predict the current signal values. The performance of this system is illustrated with a clinical case involving artificial pancreas experiments, which include data from a continuous glucose monitoring (CGM) sensor, and energy expenditure (EE) and Galvanic Skin Response (GSR) information based on wearable sensors that collect data from people with type 1 diabetes. The results indicate that the proposed method can successfully detect most of the erroneous signals and substitute them with reasonably estimated values computed by the functional redundancy system. © 2018

关键词： Wearable sensors Artificial organs control systems Deterioration Electrophysiology Error detection Kalman filters Least squares approximations Online systems Redundancy Regression analysis Signal detection Continuous glucosemonitoring (CGM) Galvanic skin response Multi sensor Partial least square (PLS) Partial least squares regression Robust Kalman filters Sensor errors Sensor redundancy

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Reconstructing Endovascular Catheter Interaction Forces in 3D using Multicore Optical Shape Sensors

Reconstructing Endovascular Catheter Interaction Forces in 3...

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2019 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)

作者： Christoff M. Heunis Vincenza Belfiore Marilena Vendittelli Sarthak Misra Surgical Robotics Laboratory University of Twente The Netherlands Department of Information Engineering Electronics and Telecommunications and with the Robotics Laboratory at the Department of Computer Control and Management Engineering Sapienza University of Rome Italy

Catheterization instruments are increasingly being improved to accurately diagnose and treat cardiovascular conditions. However, current catheter systems provide limited information about the shape of the catheter and tissue-instrument interaction forces during an intervention. Furthermore, relying on inconsistent feedback of such interaction forces during an intervention may result in tissue injury. This paper presents the first steps to estimate the interaction forces between a catheter and a mock-up arterial environment. We base the proposed method on a Pseudo-Rigid Body approximation of the catheter and integrate three-dimensional shape information provided by Fiber Bragg Grating sensors inside the catheter. The reconstructed forces along the catheter body can be fed back to the surgeon in visual and/or haptic form. In this work, the estimated forces are displayed in real-time in a graphical user interface with the reconstructed catheter shape. Experimental validation demonstrates a root mean square error of 0.03 N and a mean reconstruction error of 0.02 N.

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Identification of switched linear systems: Persistence of excitation and numerical algorithms

arXiv

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arXiv 2021年

作者： Mu, Biqiang Chen, Tianshi Cheng, Changming Bai, Er-Wei Key Laboratory of Systems and Control Institute of Systems Science Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing100190 China School of Data Science Shenzhen Research Institute of Big Data The Chinese University of Hong Kong Shenzhen518172 China State Key Laboratory of Mechanical Systems and Vibration Shanghai Jiaotong University Shanghai China Department of Electrical and Computer Engineering University of Iowa Iowa CityIA52242 United States

This paper investigates two issues on identification of switched linear systems: persistence of excitation and numerical algorithms. The main contribution is a much weaker condition on the regressor to be persistently exciting that guarantees the uniqueness of the parameter sets and also provides new insights in understanding the relation among different subsystems. It is found that for uniquely determining the parameters of switched linear systems, the minimum number of samples needed derived from our condition is much smaller than that reported in the literature. The secondary contribution of the paper concerns the numerical algorithm. Though the algorithm is not new, we show that our surrogate problem, relaxed from an integer optimization to a continuous minimization, has exactly the same solution as the original integer optimization, which is effectively solved by a block-coordinate descent algorithm. Moreover, an algorithm for handling unknown number of subsystems is proposed. Several numerical examples are illustrated to support theoretical analysis. Copyright © 2021, The Authors. All rights reserved.

关键词： Integer programming

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Human Emergency Behaviour Characteristics in Large-scale Emergencies Based on Mobile Communication Data

Research Square

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Research Square 2021年

作者： Wei, XiaoLin Luo, Yi Chen, ZhenZhen Zhao, XuMing Li, HongYan Wang, Tao Yu, Wei Zhu, Lin Liu, FangYuan Zhejiang Yuexiu University Shaoxing China School of International Business Zhejiang Yuexiu University Shaoxing China Shaoxing Key Laboratory for Smart Society Monitoring Prevention Control Shaoxing China Library Zhejiang Yuexiu University Shaoxing China Department of Computer Science and Engineering Shaoxing University Shaoxing China College of Economic and Management Zhejiang University of Science and Technology Hangzhou China UCSI Graduate Business School UCSI University Kuala Lumpur Malaysia

The characteristics of human emergency behaviour under the emergency are a crucial scientific issue in basic emergency management research. The analysis of time dynamic aspects of human behaviour based on electronic footprint data provides a new method for quantitative investigation of this problem. Previous studies generally assumed that human behaviours were randomly distributed in time, but few studies studied the impact of emergencies and carried out prediction methods through social media data. Using mobile QQ space communication data, this paper from four kinds of emergencies and one kind of conventional event data, digging out the statistical characteristic on the time dimension of human communication behaviour, and in case of any emergencies, such as public security mode of evolution, to explore intrinsic emergency regularity of the impact of human communication behaviour model and further predict human behaviour characteristics. We found that the communication peaks accompanying an emergency are local in time, resulting in a communication avalanche that importantly engages eyewitness social networks. In mobile QQ space communication, the probability distribution of the interval time of the Posting behaviour sequence shows the statistical characteristics of power-law and approximate exponential tail. Compared with most of the typical Posting behaviour, the probability distribution of the interval time of the Posting behaviour sequence is higher. At the same time, the mnemonic is lower than most of the typical Posting behaviour, with a weak anti- mnemonic. These result are theoretically helpful in understanding the regularity of the impact of emergencies on human communication behaviour patterns and have potential application value in predicting the impact degree of crises and the analysis and classification of human social attributes. © 2021, CC BY.

关键词： Time series analysis

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Single pixel fourier computed tomography

Single pixel fourier computed tomography

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Novel Techniques in Microscopy, NTM 2019

作者： Stockton, Patrick A. Wernsing, Keith A. Field, Jeff J. Squier, Jeff Bartels, Randy A. Department of Electrical and Computer Engineering Colorado State University United States Department of Biochemistry and Molecular Biology Colorado State University United States Microscope Imaging Network Foundational Core Facility Colorado State University United States School of Biomedical Engineering Colorado State University United States Center for Microintegrated Optics for Advanced Biological Control Department of Physics Colorado School of Mines United States

ISBN: (纸本)9781943580545

关键词： computerized tomography

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Hierarchic Stabilization of Flying Convex-Path-Following Formations Part II: Underactuated Agents

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IFAC-PapersOnLine 2019年第12期52卷 352-357页

作者： Mohamed I. El-Hawwary Department of Electrical Power Engineering Faculty of Engineering Cairo University Giza 12613 Egypt Division of Decision and Control Systems School of Electrical Engineering & Computer Science KTH Royal Institute of Technology SE-100 44 Stockholm Sweden

In this paper the flying convex-path-following formations problem (FCxPFF) is solved for two cases of underactuated rigid bodies. In the first case the the rigid bodies have a single degree of underactuation with two thrusts and three torques. In the second, they have two degrees of underactuation with a single thrust. The solution builds on the one developed for fully-actuated agents in Part I of the paper. In addition, the way the solution is tailored for underactuation relies on further utilization of hierarchic set stabilization, and reduction. Additional remarks on the benefits of the approach, and simulation results of the proposed solutions are presented.

关键词： Formation control distributed stabilization underactuated systems hierarchical control reduction

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Output Feedback control of an Active Magnetic Bearing System based on Adaptive Command Filtered Backstepping

Output Feedback Control of an Active Magnetic Bearing System...

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第三十八届中国控制会议

作者： Ziyin Chen Zhe Lin Yang Li Department of Control Engineering Beijing Institute of Space Mechanics & Electricity Faculty of Computer Science Otto-von-Guericke-University Magdeburg

This paper discusses the output feedback control problem of the active magnetic bearing(AMB) suspension system in absence of full-state feedback. Firstly, an exponential convergence state observer is designed to estimate the state variables only depending on output feedback. Secondly, the adaptive command filtered backstepping approach is adopted to facilitate the controller design which can avoid the complexity for calculating the analytic derivatives of the virtual control inherent in standard backstepping. Then, the compensation dynamic for filtered errors of virtual control signals is designed according to Lyapunov theory and the stability analysis shows that the compensated tracking errors can be proven asymptotic convergence. Finally, the simulation results are provided to illustrate the effectiveness of the proposed method.

关键词： Scanning Mirror(SM) Active Magnetic Bearing(AMB) Output Feedback control Adaptive Command Filtered Backstepping State Observer

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Two-line graphs of partial Latin rectangles

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Electronic Notes in Discrete Mathematics 2018年 68卷 53-58页

作者： Danan, Eiran Falcón, Raúl M. Kotlar, Dani Marbach, Trent G. Stones, Rebecca J. Department of Computer Science Tel-Hai College Upper Galilee Israel School of Building Engineering Universidad de Sevilla Sevilla Spain College of Computer and Control Engineering Nankai University Tianjin China

Two-line graphs of a given partial Latin rectangle are introduced as vertex-and-edge-coloured bipartite graphs that give rise to new autotopism invariants. They reduce the complexity of any currently known method for ... 详细信息

关键词： adequate partition autotopism group entry invariant partial Latin rectangle

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