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IFAC-PapersOnLine 2015年第29期48卷 217-228页

作者： Rossiter, J.A. Department of Automatic Control and Systems Engineering University of Sheffield SheffieldS1 3JD United Kingdom

Modern technology offers many opportunities to do things differently and hence a key challenge for academic staff is to decide which technology or approach do they use, how do they use it and of course, why should they use it? This plenary paper is aimed at pragmatic approaches to improving the quality of the student learning experience which recognise limitations on staff time and hence using the belief: sometimes quick and dirty now is better than perfect in the distant future. © 2015, IFAC (International Federation of automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Teaching systems science Web Design Academic staff Distant futures Education resource Modern technologies Staff time Student learning experiences Teaching methodologies Video production

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Using an understanding of feedback processes to improve student learning

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IFAC-PapersOnLine 2016年第6期49卷 57-62页

作者： Rossiter, J.A. Department of Automatic Control and Systems Engineering University of Sheffield SheffieldS1 3JD United Kingdom

The main purpose of this paper is to give some novel insights into the creation and use of feedback within a learning environment. The literature commonly puts all the emphasis for feedback on what staff do, but this paper will demonstrate using analogies with classical control feedback loops that it is in fact not staff who create feedback, but students. Consequently, rather than pressurising staff to create more, faster, better ‘feedback’ the onus should be on educating students, and staff, on how to create effective feedback from the myriad of information available to them. © 2016

关键词： Feedback Computer aided instruction Measurement Students Classical control Feedback process Learning environments Student engagement Student learning Student satisfaction

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Low production cost virtual modelling and control laboratories for chemical engineering students

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IFAC-PapersOnLine 2016年第6期49卷 230-235页

作者： Rossiter, J.A. Department of Automatic Control and Systems Engineering University of Sheffield SheffieldS1 3JD United Kingdom

This paper gives a brief review of work on virtual and remote laboratories along with a critique of their strengths and weaknesses. This is used as a motivation for a proposed method for producing virtual laboratories which, while relatively crude in comparison with professional alternatives, are much cheaper and faster to produce and thus can be created using the skill set and time of normal academics. Some examples and the coding processes are demonstrated. © 2016

关键词： Cost engineering Laboratories Chemical engineering students Coding process Independent learning Modelling and controls Production cost Remote laboratories Student engagement Virtual laboratories

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Gain Scheduling Dual Mode MPC for a Solar Thermal Power Plant

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IFAC-PapersOnLine 2016年第18期49卷 128-133页

作者： Alsharkawi, A. Rossiter, J.A. Department of Automatic Control and Systems Engineering University of Sheffield SheffieldS1 3JD United Kingdom

A nonlinear gain scheduling control strategy is proposed for a concentrated solar thermal power plant. The strategy involves the identification of local linear time-invariant state space models around a family of operating points, the design of corresponding local linear dual mode model-based predictive controllers and the selection of an appropriate scheduling variable to govern the switching. The local models are estimated directly from input-output data using a subspace identification method while taking into account the frequency response of the plant. Input-output data are obtained from a nonlinear simulation model of the plant rather than the plant itself. The effectiveness of the proposed control strategy in terms of tracking and disturbance rejection is evaluated through two different scenarios created in a nonlinear simulation environment. © 2016

关键词： Linear control systems Disturbance rejection Frequency response Model predictive control Predictive control systems Scheduling Solar concentrators Solar heating State space methods Thermoelectric power plants Dual mode model Gain Scheduling Non linear control Resonant mode Solar thermal power plants Subspace identification

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Distributed MPC: Guaranteeing Global Stability from Locally Designed Tubes

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IFAC-PapersOnLine 2017年第1期50卷 11829-11834页

作者： Hernandez, Bernardo Baldivieso, Pablo Trodden, Paul Department of Automatic Control & Systems Engineering University of Sheffield SheffieldS1 3JD United Kingdom

This paper studies a fundamental relation that exists between stabilizability assumptions usually employed in distributed model predictive control implementations, and the corresponding notions of invariance implicit in such controllers. The relation is made explicit in the form of a theorem that presents sufficient conditions for global stabilizability. It is shown that constraint admissibility of local robust controllers is sufficient for the global closed-loop system to be stable, and how these controllers are related to more complex forms of control such as tube-based distributed model predictive control implementations. © 2017

关键词： controllers

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Body-weight-supported treadmill locomotion with spring brake orthosis

Body-weight-supported treadmill locomotion with spring brake...

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11th International Conference on Climbing and Walking Robots and the Support Technologies for Mobile Machines, CLAWAR 2008

作者： Saiful Huq, M. Tokhi, M.O. Department of Automatic Control and Systems Engineering University of Sheffield United Kingdom

ISBN: (纸本)9812835768

A new form of body-weight supported treadmill walking technique is presented in this paper which may serve as a suitable form of therapeutic intervention with minimal therapists support. While the technique relies on spring brake orthosis (SBO) for the swing phase generation, hip extension is produced by the foot being literally dragged backwards by the treadmill belt, appropriate trunk position and orientation being simultaneously maintained by voluntary hand support. Voluntary hand support is simulated with fuzzy logic controllers and the whole gait cycle is controlled as a finite state machine with event detection from kinematic data. The simulation resulted in a complete gait cycle whose parameters were largely dependent on the chosen treadmill speed. The torque requirement from the hand joints (shoulder and elbow) for the successful implementation of the gait cycle is also analysed.

关键词： Brakes

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Pneumonia Detection from X-ray Images Using Convolutional Neural Networks 24

Pneumonia Detection from X-ray Images Using Convolutional Ne...

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24th International Conference on control systems and Computer Science, CSCS 2023

作者： Dediu, Viorel Udrea, Andreea Faculty of Automatic Control and Computer Science Univesity Politehnica of Bucharest Department of Automatic Control and Systems Engineering Bucharest Romania

ISBN: (纸本)9798350313390

Pneumonia is one of the top causes of death in Romania and early detection of this disease improves the recovery chances and shortens the length of hospitalization. In this work, we develop a solution for automatic pneumonia detection based on convolutional neural networks. Four network models are investigated. They are trained on 4.163 images from a public dataset and tested on 530 images. The best results are obtained by one of the proposed models conducting to a sensitivity of 98.72%, an accuracy of 89.81%, and ROC 93.46%. Thus, this research proposes a lightweight screening tool that can help triaging the patients with pneumonia. © 2023 IEEE.

关键词： Convolution

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Gas Phase Train in Upstream Oil & Gas Fields: PART-III control System Design

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IFAC-PapersOnLine 2017年第1期50卷 13735-13740页

作者： Al-Naumani, Y.H. Rossiter, J.A. Department of Automatic Control and Systems Engineering University of Sheffield SheffieldS1 3JD United Kingdom

This paper presents and implements a control structure solution based on MPC for two control problems affecting gas phase train in the existing oil and gas production plants: The disturbance growth in the series connected process and the control system dependency on operators. This work examines the integration of small size MPC's with the classical PID control system to handle interactive control loops in three series gas treatment processes. © 2017

关键词： Process control Gas industry Gas plants Gases Natural gas fields Three term control systems control problems control structure Disturbance growth Interactive control Oil and gas production Process Modeling Series connected System dependencies

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Robust and Decoupling Approach to PID control of Vapour-compression Refrigeration systems

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IFAC-PapersOnLine 2018年第4期51卷 698-703页

作者： Rodríguez, David Bejarano, Guillermo Alfaya, José A. Ortega, Manuel G. Department of Systems Engineering and Automatic Control University of Seville Camino de los Descubrimientos no number SevilleE-41092 Spain

This paper presents a combined approach to the design of PID control applied to vapour-compression refrigeration systems. The underlying controller consists of two decentralised PIDs, aiming to control both the reference on the temperature of the evaporator secondary fluid, imposed by the cooling demand, and the degree of superheating, by manipulating the compressor speed and the expansion valve. A partial decoupling matrix is calculated to reduce the high coupling between the controlled variables, while the PIDs are tuned applying affine parameterisation and considering the condition for robust stability given by the study on the uncertainty sources and the estimation of the uncertainty region around a nominal linear model. The designed controller is applied to the system proposed in the Benchmark process challenge and some comparative simulations are presented and discussed, while the performance indices of the proposed controller with respect to the reference one are analysed. © 2018

关键词： controllers Benchmarking Linear systems Refrigeration Three term control systems Comparative simulation controlled variables Decoupling Robust stability Uncertain linear system Uncertainty regions Vapour compression refrigeration systems Vapour compression refrigerations

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Nested distributed MPC

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IFAC-PapersOnLine 2017年第1期50卷 11822-11828页

作者： Baldivieso Monasterios, Pablo R. Hernandez, Bernardo Trodden, Paul A. Department of Automatic Control & Systems Engineering University of Sheffield SheffieldS1 3JD United Kingdom

We propose a distributed model predictive control approach for linear time-invariant systems coupled via dynamics. The proposed approach uses the tube MPC concept for robustness to handle the disturbances induced by mutual interactions between subsystems; however, the main novelty here is to replace the conventional linear disturbance rejection controller with a second MPC controller, as is done in tube-based nonlinear MPC. In the distributed setting, this has the advantages that the disturbance rejection controller is able to consider the plans of neighbours, and the reliance on explicit robust invariant sets is removed. © 2017

关键词： controllers Constrained optimization Discrete time control systems Distributed parameter control systems Disturbance rejection Estimation Invariance Linear control systems Linear systems Model predictive control Predictive control systems Time varying control systems control of constrained systems Decentralized Distributed control Distributed Model predictive control Linear time invariant systems Model predictive Mutual interaction Robust invariant set

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