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检索条件"机构=Dept of Automatic Control and Systems Engineering"

共 398 条记录，以下是11-20 订阅

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Zero-Shot Learning for Intelligent Fault Detection 27

Zero-Shot Learning for Intelligent Fault Detection

引用

27th International Conference on Automation and Computing, ICAC 2022

作者： Zhang, Siyu Wei, Hua-Liang University of Sheffield Dept. Automatic Control and Systems Engineering Sheffield United Kingdom

ISBN: (数字)9781665498074

ISBN: (纸本)9781665498074

Signal-based fault detection, as an essential technology in many engineering and industrial applications, has received extensive attention. Nevertheless, in a real-world application setting, collecting samples for some specific types of faults may be time-consuming and damaging, implying that samples of unseen faults may be unavailable in the training step. Keeping this in mind, we present a new semantic space-based zero-shot learning (SSB-ZSL) method for fault detection. The implementation of the method comprises three phases: feature extraction, human-defined semantic space, and a feature embedding model to address this issue. To evaluate the proposed method, we carry out experiments on two real datasets: a vibration-based rolling element bearing dataset from Case Western Reserve University, and an acoustic-based air compressor fault dataset. The results are promising and significantly better than that given by the compared state-of-the-art methods, showing that the proposed method can effectively detect unseen types of faults in the absence of their samples. © 2022 IEEE.

关键词： Fault detection

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A droop controller achieving proportional power sharing without output voltage amplitude or frequency deviation

A droop controller achieving proportional power sharing with...

引用

作者： Zeng, Yu Zhong, Qing-Chang Dept. of Automatic Control and Systems Engineering University of Sheffield Sheffield United Kingdom

ISBN: (纸本)9781479956982

The droop controller is widely used for the parallel operation of inverters. However, the conventional droop controller has a trade-off between the power sharing and the regulations of the output voltage amplitude and frequency. In order to remove this trade-off, a new droop controller is presented in this paper. This method adopts the structure of the robust droop controller and utilizes the transient droop characteristic, which enables proportional power sharing without output voltage amplitude or frequency deviation. Simulation results are provided to demonstrate the feasibility and excellent performance of the proposed controller. © 2014 IEEE.

关键词： controllers

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Assessing Uncertainty in Space Weather Forecasting Using Quantile Regression and Complex Nonlinear systems Identification Techniques 6

Assessing Uncertainty in Space Weather Forecasting Using Qua...

引用

6th International Conference on Computing, Electronics and Communications engineering, iCCECE 2023

作者： Wei, Hua-Liang Balikhin, Michael A. Boynton, Richard J. Walker, Simon N. The University of Sheffield Dept. of Automatic Control and Systems Engineering Sheffield United Kingdom

ISBN: (纸本)9798350340921

Space weather forecasting is of global interest, and its importance is well established in research community and recognized by government, industries and stockholders. Over the past years, many types of predictive models have been developed in the literature. There is a general agreement that forecasting models should not only provide point prediction but also inform the uncertainty associated with the prediction. This study presents a novel method bases on quantile regression and complex dynamic modelling for measuring uncertainties in space weather forecasting. The approach is implemented using Quantile regression and Nonlinear AutoRegressive Moving Average with Exogenous inputs (NARMAX) methods (for short the approach is called Q-NARMAX). The method is applied to Disturbance storm index (Dst) observations to examine its interpretability and capability for uncertainty analysis. Results show that the proposed Q-NARX model can produce excellent predictions of the Dst index, and meanwhile provides a measure for assessing the uncertainty in the forecast. The innovative integration of quantile regression, complex dynamic modelling and nonlinear system identification techniques enables the proposed work to have following attractive advantages and properties: 1) it can produce excellent prediction accuracy for space weather forecasting, 2) it uses transparent models to approximate (represent) black-box systems, enabling to interpret the dependent relationship between space weather indices (system outputs) and their drivers (system inputs), and 3) more importantly, it allows for uncertainty assessment and analysis of models and forecasts. © 2023 IEEE.

关键词： Uncertainty analysis

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Low-order model for tokamak plasma current control

Low-order model for tokamak plasma current control

引用

ICCAS-SICE 2009 - ICROS-SICE International Joint Conference 2009

作者： Garrido, Aitor J. Garrido, Izaskun Sevillano, M. Goretti Amundarain, Modesto Alberdi, Mikel Barambones, Oscar Martija, Itziar Dept. of Automatic Control and Systems Engineering EUITI de Bilbao UPV/EHU Spain Dept. of Automatic Control and Systems Engineering EUI de Vitoria UPV/EHU Spain Dept. of Mechanical Engineering EUITI de Bilbao UPV/EHU Spain

ISBN: (纸本)9784907764296

Nowadays there exists a need of carrying out new features and improvements in the existing and future tokamak devices as ITER or DEMO. The present capabilities of the control engineering and the development of fusion technologies allow the achievement new plasma configurations. These aspects, jointly with the increased performance of the computer hardware and the advances in plasma modelling and control, give a new impulse to the development of models and methods for the design of the scenario. In this sense, the present work is devoted to derive a low-order model of the plasma and surrounding conducting structure with the purpose of facilitating the control requirements in terms of plasma shape and current density profiles. © 2009 SICE.

关键词： Tokamak devices

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Output feedback stabilization of linear uncertain discrete systems with guaranteed cost 15th

Output feedback stabilization of linear uncertain discrete s...

引用

15th World Congress of the International Federation of automatic control, 2002

作者： Rosinová, Danica Veselý, Vojtech Dept. of Automatic Control Systems Faculty of Electrical Engineering and IT Slovak University of Technology Bratislava Slovakia

ISBN: (纸本)9783902661746

In this paper new necessary and sufficient conditions for static output feedback robust controller design for linear discrete time-invariant systems have been used. The output feedback robust controller design may be reduced to the problem of finding a feasible point under Biaffine Matrix Inequality constraint. In this paper the BMI problem of the output feedback robust controller design has been reduced to LMIs problem. The proposed LMI based algorithms are computationally simple and tightly connected with the Lyapunov function, quadratic stability, guaranteed cost and LQ optimal state feedback design. The structure of the output gain matrix can be prescribed by the designer. Copyright © 2002 IFAC.

关键词： Discrete time control systems

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Fault detection, isolation and diagnosis with particle filters for nonlinear stochastic systems 13

Fault detection, isolation and diagnosis with particle filte...

引用

13th IFAC Symposium on System Identification, SYSID 2003

作者： Kadirkamanathan, Visakan Li, Ping Automatic Control and Systems Engineering Dept University of Sheffield United Kingdom Electrical and Electronic Engineering Dept Loughborough University United Kingdom

In this paper, we provide a particle filtering based approach to the problems of fault detection isolation and diagnosis of general nonlinear stochastic systems. The algorithms use decision criteria based on the generalised likelihood ratios which are computed using the samples based probability distribution information of the state variables given by the particle filters. © 2003 International Federation of automatic control.

关键词： Monte Carlo methods

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Fast scale instability problem of cascaded buck conversion system and its phase-shifted-carrier solution 7

Fast scale instability problem of cascaded buck conversion s...

引用

7th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2015

作者： Zhang, Xin Zhong, Qing-Chang Ming, Wen-Long Dept of Automatic Control and Systems Engineering University of Sheffield United Kingdom Dept of Electrical and Computer Engineering Institute of Technology Illinois United States

ISBN: (纸本)9781467371506

Cascaded Buck conversion system is a typical structure in dc distributed power system (DPS). It is known that, the interaction between its individually designed power modules/subsystems may cause the instability problem of the whole system. The traditional solution is to design this system by Middlebrook criterion. However, authors found that, even if the entire system meets Middlebrook criterion, the fast scale instability problem may still occurs. In order to analyse and solve this problem, this paper presents a fast scale model for the cascaded buck conversion system. By this model, the essential reason for fast scale intsability problem is explained and a phase-shifted-carrier (PSC) solution is also proposed. Finally a 48 V-24 V-5 V 200 W cascaded system is built, and the experimental results confirmed the theoretical analysis.1 © 2015 IEEE.

关键词： Stability

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Genetic algorithm active vibration control of a flexible plate structures

Genetic algorithm active vibration control of a flexible pla...

引用

51st Annual Meeting of the International Society for the systems Sciences, ISSS 2007

作者： Mat Darus, I.Z. Tokhi, M.O. Faculty of Mechanical Engineering Universiti Teknologi Malaysia Malaysia Dept. of Automatic Control and Systems Engineering University of Sheffield United Kingdom

ISBN: (纸本)9781605600437

This paper presents the development of an active vibration control (AVC) mechanism for a flexible plate structure using a Genetic Algorithm (GAs) strategy. The global optimisation technique of GAs is utilised to obtain a dynamic model of a flexible plate structure and verified within the AVC system. The GA based AVC algorithm thus developed is implemented within a flexible plate simulation environment and its performance in the reduction of vibration of the plate is assessed. The validation of the algorithm is presented in both the time and frequency domains. An assessment of the results thus obtained is given in comparison to the AVC system using conventional recursive least squares (RLS) method. Investigations reveal that the developed GA based AVC system performs better in the suppression of vibration of a flexible plate structure compared to an RLS based AVC system.

关键词： Genetic algorithms

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Synchronverter-based transformerless PV inverters

Synchronverter-based transformerless PV inverters

引用

作者： Ming, Wen-Long Zhong, Qing-Chang Dept. Automatic Control and Systems Engineering University of Sheffield SheffieldSI 3JD United Kingdom

ISBN: (纸本)9781479940325

In this paper, a transformerless PV inverter is proposed, which is formed by adding a neutral leg into conventional half bridge inverter. It consists of one neutral leg and one inverter leg. The presence of the neutral leg enables the direct connection between the ground of PV panels and the ground. Two main benefits are then obtained. First, the common mode currents are completely eliminated because the stray capacitors between the PV panels and the grid neutral line are bypassed. Another benefit is the voltage of the PV is only required to be higher than the peak value of the grid voltage, which is same as that of conventional full bridge inverter. In addition, the synchronverter technology designed for three-phase inverters is extended to a single-phase case to design the controller of the inverter leg. As a result, the proposed inverter becomes more grid-friendly. The control of the two legs are independent with each other, which means the controller design much easier. The performance of the whole system is evaluated in detail with the provided real-time simulation results. © 2014 IEEE.

关键词： Electric inverters

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Design of robust output affine quadratic controller 15th

Design of robust output affine quadratic controller

引用

15th World Congress of the International Federation of automatic control, 2002

作者： Veselý, Vojtech Dept. of Automatic Control Systems Faculty of Electrical Engineering and Information Technology Slovak University of Technology Bratislava Slovakia

The paper addresses the problem robust output feedback controller design with guaranteed cost and affine quadratic stability for linear continuous time affine systems. The proposed design method leads to a non-iterati... 详细信息

ISBN: (纸本)9783902661746

关键词： Feedback

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