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UKACC International Conference on control (control)

作者： Paulo Loma-Marconi Paul Trodden Iñaki Esnaola Department of Automatic Control & Systems Engineering University of Sheffield Sheffield United Kingdom

ISBN: (数字)9798350374261

ISBN: (纸本)9798350374278

In this paper, we study the stability of a discrete-time nonlinear networked system controlled by model predictive control without explicit terminal constraints. The system is subject to input constraints and random packet losses on the actuation communication channel between the controller and the plant. We consider the scenario where a buffer-intended to store transmitted control sequences and provide some robustness to packet losses-is present, and also the scenario where a buffer is not present. We analyse the stability of the closed-loop system in these stochastic scenarios, employing the assumption that the terminal cost is merlye a local, rather than global, control Lyapunov function (CLF). We develop conditions that characterize an upper bound on the number of consecutive packet losses in order that stability is maintained.

关键词： Costs Upper bound Packet loss Stochastic processes Propagation losses Stability analysis Robustness

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Higher harmonics influence on stability of arcing single phase-to-earth faults in 6−10 kV networks with arc-suppression coil

Higher harmonics influence on stability of arcing single pha...

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2021 IEEE Power and Energy Student Summit, PESS 2021

作者： Kutumov, Yuri D. Shadrilkova, Tatyana Yu. Shuin, Vladimir A. Automatic Control of Electrical Power Systems Department Ivanovo State Power Engineering University Ivanovo Russia

ISBN: (纸本)9783800757169

This paper focuses on the research of steady-state earthing arc burning conditions in the context of influence of higher harmonic components in earth fault current. The criteria of arc burning stability and of single phase-to-earth fault transfer to phase-to-phase short circuit are offered in the paper. Calculation of the time period for which arcing single phase-to-earth fault transfers to phase-to-phase short circuit, was conducted. Also the root mean square value of residual fault current which makes steady-state earthing arc burning possible, was defined with the usage of COMSOL Multiphysics and PSCAD software. The obtained results can be used during development and research of single phase-to-earth fault and thermal overload relay protection devices. © VDE VERLAG GMBH · Berlin · Offenbach.

关键词： Electric grounding

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A Reinforcement Learning-Based Approach for Optimal Output Tracking in Uncertain Nonlinear systems with Mismatched Disturbances

A Reinforcement Learning-Based Approach for Optimal Output T...

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UKACC International Conference on control (control)

作者： Zezhi Tang J Anthony Rossiter George Panoutsos Department of Automatic Control and Systems Engineering University of Sheffield Sheffield United Kingdom

ISBN: (数字)9798350374261

ISBN: (纸本)9798350374278

In this paper, the optimal control problem of uncertain nonlinear systems is considered. A nonlinear disturbance observer (NDO) is proposed to measure the lumped uncertainties present in the system. Disturbances that do not enter the same channel as the control signal, so-called mismatched disturbances, are difficult to reject directly within the control channel. To overcome the challenge, a generalized disturbance observer-based compensator is implemented to address the uncertainty compensation problem by attenuating its influence on the output channel. In real time, by augmenting the system states with the output tracking error, we develop a composite actor-critic reinforcement learning (RL) scheme for approximating the optimal control policy as well as the ideal value function pertaining to the compensated system by solving the Hamilton-Jacobi-Bellman (HJB) equation. Concurrent learning is applied in this article by using the recorded data of the known model of the system, in order to enhance the robustness of the system by canceling the influence of the probing signal. Simulation results demonstrate the effectiveness of the proposed scheme, offering an optimal solution for the output tracking problem in a second-order model with mismatched disturbances.

关键词： Uncertainty Simulation Measurement uncertainty Optimal control Reinforcement learning Mathematical models Robustness

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Enhancing 3D Human Skeleton Key-point Detection through Weakly Supervised Learning and Multi-level Attention Mechanisms

Enhancing 3D Human Skeleton Key-point Detection through Weak...

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2023 IEEE EMBS Special Topic Conference on Data Science and engineering in Healthcare, Medicine and Biology, IEEECONF 2023

作者： Xu, Meng Gong, Yuanhao Dogramadzi, Sanja University of Sheffield Department of Automatic Control and Systems Engineering SheffieldS10 2TN United Kingdom Shenzhen University Faculty of Electronics and Information Engineering China

ISBN: (纸本)9798350383386

With the soaring interest in understanding the dynamics of human body skeletons for applications such as action recognition and video understanding, the significance of precise 3D key-point detection has become increasingly prominent. Despite the advancements, existing approaches struggle to address the issues of occlusions and limited annotated data. This paper proposes a novel framework integrating a multilevel attention mechanism and weakly supervised 3D key-point generation to tackle these prevalent issues, enhancing both the accuracy and efficiency of human pose estimation. © 2023 IEEE.

关键词： Musculoskeletal system

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Fuzzy-Model-Based Fault-Tolerant control for Stochastic Re-Entrant Manufacturing systems

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IEEE Transactions on systems, Man, and Cybernetics: systems 2025年第5期55卷 3542-3556页

作者： Zhang, Kexin Gao, Qing Ding, Steven X. Lu, Jinhu Qiu, Jianbin Guo, Yige Beihang University School of Cyber Science and Technology Beijing100191 China Beihang University School of Automation Science and Electrical Engineering Beijing100191 China Hangzhou Innovation Institute Beihang University Hangzhou310051 China Zhongguancun Laboratory Beijing100095 China Institute for Automatic Control and Complex Systems University of Duisburg-Essen Duisburg47057 Germany Research Institute of Intelligent Control and Systems Harbin Institute of Technology Harbin150001 China Zhongguancun Laboratory Beijing China

This study addresses the problem of guaranteed cost fault-tolerant fuzzy control for multiline re-entrant manufacturing systems (RMSs) against stochastic disturbances and workstation faults. Initially, a nonlinear hyperbolic impulsive partial differential equation model is employed to describe the complex and hybrid dynamics of RMSs suffering from unexpected faults within the working stations, and then the corresponding approximation T-S fuzzy model is constructed. In what follows, with the aid of the parallel distributed compensation fuzzy control scheme, the main results of stability analysis and controller synthesis for the closed-loop re-entrant manufacturing control system are derived using a timer-dependent Lyapunov functional with spatio-temporal auxiliary variables. It is found that by means of the proposed fault-tolerant control approach, the RMS can be effectively and robustly driven to a desired production mode with steady feeding and production rates while the upper bound of a quadratic cost function is minimized. Finally, the effectiveness of the proposed control approach is validated through numerical simulations. © 2013 IEEE.

关键词： Fuzzy control

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Distributed Sensor FD for Sensor Networks 32

Distributed Sensor FD for Sensor Networks

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32nd IEEE International Symposium on Industrial Electronics, ISIE 2023

作者： Zhang, Jiarui Ding, Steven X. Li, Linlin University of Duisburg-Essen Institute for Automatic Control and Complex Systems Duisburg Germany University of Science and Technology Beijing School of Automation and Electrical Engineering Beijing China

ISBN: (纸本)9798350399714

The main objective of this paper is to develop a distributed sensor fault detection (FD) approach for sensor networks in the presence of noise and transmission time of information exchange. To be specific, the approach optimizes the performance of FD by minimizing the detection uncertainty and the online implementation of the proposed method is in a distributed and recursive manner. Finally, a numerical example is illustrated to show that the distributed approach can successfully and efficiently accomplish the FD task. © 2023 IEEE.

关键词： Sensor networks

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A Power-Communication Co-Simulation Platform for Real-Time Microgrid Cyber Security Analysis

A Power-Communication Co-Simulation Platform for Real-Time M...

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Artificial Intelligence of Things and systems (AIoTSys), International Conference on

作者： Dongmeng Qiu Mengxiang Liu Xin Zhang Department of Automatic Control and Systems Engineering University of Sheffield Sheffield United Kingdom

ISBN: (数字)9798331507886

ISBN: (纸本)9798331507893

The rapid digitalisation process in power system has greatly benefited the large-scale integration of distributed energy resources (DERs), essentially accelerating the progress towards net zero. However, numerous cyber attacks such as false data injection (FDI) attacks are impeding the normal control and operation activities. This paper aims to establish a real-time microgrid co-simulation platform to fully study the impacts of realistic attack events on micorgrid's control performance. Although there exist a large number of power-communication co-simulation platforms for the power system, they are designed to mainly provide validation services for control and operation algorithms and little attention has been paid to the cyber security. In the established microgrid platform, power and communication parts are simulated in Typhoon Hardware-in-the-loop(HIL) 602+ and EXata Network Simulator, respectively, and a dedicated synchronisation scheme is developed and embedded in Raspberry Pis to achieve master-slave data exchange between them. Based on the advanced cyber libraries provided by EXata, realistic FDI and packet drop attacks are mounted against the mapped communication links within EXata. The results indicate that these cyber attacks can severely influence the microgrid control performance including destabilising system states and specific state deviations, further demonstrating the necessity of deploying effective cyber-resilience enhancement mechanisms.

关键词： Tropical cyclones Prevention and mitigation Microgrids Real-time systems Main-secondary Libraries Power systems Synchronization Security Cyberattack

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Computationally Efficient Kalman Filter Framework for Intra-Frame Image Reconstruction with a Rolling Shutter Camera

Computationally Efficient Kalman Filter Framework for Intra-...

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IEEE International Conference on Image Processing

作者： Sabeethan Kanagasingham Andrew R. Mills Visakan Kadirkamanathan Department of Automatic Control and Systems Engineering The University of Sheffield Sheffield United Kingdom

ISBN: (数字)9798350349399

ISBN: (纸本)9798350349405

This paper addresses the problem of reconstructing image sequences from a rolling shutter camera-based thermal image acquisition system that integrates the image field over an exposure time. It proposes a novel approach to extend the distributed Kalman filtering framework for intra-frame reconstruction. This accounts for the exposure effect through a state-augmentation model, while respecting the row-byrow image acquisition process. Additionally, two alternative rolling shutter scan strategies: interlaced-x and random, are explored to mitigate delays in observing abrupt changes inherent in sequential rolling shutter scans. Simulation results demonstrate that the proposed approach effectively accommodates exposure and achieves reliable intra-frame reconstruction quality. The interlaced-x scan strategy, with x equal to the size of the image partition block, emerges as the preferred choice, highlighting improved performance in recovering from sudden events. The augmented distributed Kalman filter offers a scalable solution to enhance temporal resolution and overall reliability of thermal imaging of dynamic thermal processes.

关键词： Image resolution Simulation Thermal variables measurement Three-dimensional printing Size measurement Time measurement Steady-state

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RGB-D Image-Based Deep Neural Network Body Shape Classifier

RGB-D Image-Based Deep Neural Network Body Shape Classifier

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2023 IEEE EMBS Special Topic Conference on Data Science and engineering in Healthcare, Medicine and Biology, IEEECONF 2023

ISBN: (纸本)9798350383386

Leveraging the untapped potential of depth information in RGB-D images, this study introduces a deep neural network classifier for advanced body shape classification. Going beyond traditional RGB image analysis, our method innovatively employs multi-task learning, simultaneously performing body shape classification, posture estimation, and body part segmentation to achieve superior accuracy. This approach promises to revolutionize personalization avenues in healthcare, fashion, and entertainment industries, establishing a new benchmark in body shape analysis. © 2023 IEEE.

关键词： Deep neural networks

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Second-Order Discrete-Analog Filters on Switched Capacitors with Two Electronic Keys

Second-Order Discrete-Analog Filters on Switched Capacitors ...

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2024 IEEE Ural-Siberian Conference on Biomedical engineering, Radioelectronics and Information Technology, USBEREIT 2024

作者： Denisenko, Darya Prokopenko, Nikolay Butyrlagin, Nikolay Ivanov, Yuri Don State Technical University Department Of Scientific Research Russia Southern Federal University Department Of Automatic Control Systems Rostov-on-Don Russia Don State Technical University Department Of Information Systems And Radio Engineering Rostov-on-Don Russia

ISBN: (纸本)9798350362893

Two new modifications of second-order low-frequency discrete-analog filters (DAFs) based on switched capacitors with two electronic keys have been developed and investigated. The first modification contains a resistive signal adder based on a buffer amplifier, in the second modification the signal adder is implemented on a differential difference operational amplifier. The basic formulas for the transmission coefficient at zero frequency and pole frequency, and also a frequency and attenuation of the pole are given. The transmission coefficient of new circuits in the passband does not depend on the capacitances of the frequency-setting capacitors. Computer modeling was performed in the Micro-Cap environment, which confirms the coincidence of the calculated main parameters of the DAF and their time characteristics. The developed DAFs were studied at various input signal frequencies, which differ by several orders of magnitude, including the low, medium and high frequency ranges. It is shown that the graph of the DAF output signal has a 'step' character, which corresponds to the physical processes of signal conversion in filters of the class under consideration. The low parametric sensitivity of presented DAF circuits is achieved by the fact that the pole attenuation and transmission coefficient of such DAFs cease to depend on the parameters of the tuning elements. © 2024 IEEE.

关键词： Poles

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