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2018 Australian and New Zealand control Conference, ANZCC 2018

作者： Grzedzinski, Kacper Trodden, Paul Rolls-Royce Control Monitoring and Systems Engineering University Technology Centre Department of Automatic Control and Systems Engineering University of Sheffield United Kingdom

ISBN: (纸本)9781538666173

The dual-control problem of simultaneously regulating a plant and identifying its dynamics is addressed in a linear model predictive control (MPC) framework. We propose and study an approach where two optimal control problems are solved in series, online: The first is a standard regulating linear quadratic MPC problem, which achieves exponential nominal stability;the second is an ancillary optimization problem that promotes persistency of excitation, in order to facilitate online learning of the system dynamics. Maximization of the minimum eigenvalue of predicted information matrix increments, in a recursive least squares (RLS) scheme, is used. Our main result, achieved by employing inherent robustness from exponentially stabilizing MPC, establishes a bound on the permitted magnitude of excitation applied by the secondary optimization;in terms of the system model error. Satisfaction of this bound guarantees stability of the closed-loop uncertain system, despite the exciting perturbations. © 2018 IEEE.

关键词： Model predictive control

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Weak Interactions Based System Partitioning Using Integer Linear Programming

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IFAC-PapersOnLine 2017年第1期50卷 3635-3641页

作者： Guicherd R. Trodden P.A. Mills A.R. Kadirkamanathan V. Rolls-Royce University Technology Centre Department of Automatic Control & Systems Engineering University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom

The partitioning of a system model will condition the structure of the controller as well as its design. In order to partition a system model, one has to know what states and inputs to group together to define subsystem models. For a given partitioning, the total magnitude of the interactions between subsystem models is evaluated. Therefore, the partitioning problem seeking for weak interactions can be posed as a minimization problem. Initially, the problem is formulated as a non-linear integer minimization that is then relaxed into a linear integer programming problem. It is shown within this paper that cuts can be applied to the initial search space in order to find the least interacting partitioning; only composed of controllable subsystems. Two examples are given to demonstrate the methodology. © 2017

关键词： decentralized control Decoupling problems integer programming linear multivariable systems

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Weak interactions based system partitioning using integer linear programming

arXiv

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arXiv 2017年

作者： Guicherd, Romain Trodden, Paul A. Mills, Andrew R. Kadirkamanathan, Visakan Rolls-Royce University Technology Centre Department of Automatic Control & Systems Engineering University of Sheffield Mappin Street SheffieldS1 3JD United Kingdom

The partitioning of a system model will condition the structure of the controller as well as its design. In order to partition a system model, one has to know what states and inputs to group together to define subsystem models. For a given partitioning, the total magnitude of the interactions between subsystem models is evaluated. Therefore, the partitioning problem seeking for weak interactions can be posed as a minimization problem. Initially, the problem is formulated as a non-linear integer minimization that is then relaxed into a linear integer programming problem. It is shown within this paper that cuts can be applied to the initial search space in order to find the least interacting partitioning;only composed of controllable subsystems. Two examples are given to demonstrate the methodology. Copyright © 2017, The Authors. All rights reserved.

关键词： Integer programming

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Demonstration of 6kW/kg 50kW Grid Facing Power Converter for Future Aircraft

Demonstration of 6kW/kg 50kW Grid Facing Power Converter for...

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IEEE Region 10 Conference

作者： C. F. Tong A. Nawawi Shan Yin Yitao Liu K. J. Tseng Rejeki Simanjorang Rolls-Royce@NTU Corporate Lab Nanyang Technological University Singapore School of Electrical and Electronic Engineering Nanyang Technological University Singapore College of Mechatronics and Control Engineering Shenzhen University China Advanced Technology Centre Rolls-Royce Singapore Pte. Ltd Singapore

ISBN: (纸本)9781509025985

This paper demonstrates a 60kHz 50kW/400Hz grid facing three-phase power converter using commercially off-the-shelf Silicon Carbide (SiC) module. The power converter is designed to achieve high gravimetric density for possible application in future aircraft. In order to achieve high power density, the power converter is operated with high switching frequency to minimize its LCL filter size that connects to the grid. The high switching frequency is achieved by optimizing circuit design that consider minimum parasitic inductances in the power loop and high speed gate driver. As a result, the grid facing power converter with 60kHz switching frequency and total efficiency 97.7% are demonstrated. Gravimetric power density of the converter is above 6kW/kg with 50% of its total weight coming from its output inductors.

关键词： SiC Modules Power density SiC Switching Characteristics

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Advances in Addressing Challenges in Complex control systems Design

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IFAC Proceedings Volumes 2014年第1期47卷 955-958页

作者： Arun Chakrapani Rao Jun Liu Rolls-Royce University Technology Centre in Control and Monitoring Systems Engineering Department of Automatic Control and Systems Engineering (ACSE) University of Sheffield S1 3JD UK (Tel: +44(0)114-222-5687 Department of ACSE University of Sheffield S1 3JD UK

This paper gives an account of various challenges that are faced in the design and development of complex control systems and software, within the automotive and aerospace domains, in particular, which are highly relevant to the incorporation of active mechanisms for dynamic systems. It also analyses what new recent advances are helping some of these being overcome in the research and engineering environments.

关键词： Active Mechanisms for Dynamic systems Model-Based Design systems engineering V&V

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Development of a high-bandwidth active load for an aircraft electrical systems evaluation platform

Development of a high-bandwidth active load for an aircraft ...

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7th IET International Conference on Power Electronics, Machines and Drives, PEMD 2014

作者： Chivite-Zabalza, F.J. Forsyth, A.J. Calvignac, J. Long, S. Ingeteam Power Technology S.A. 48170 Zamudio Spain The University of Manchester School of Electrical and Electronic Engineering Sackville Street Manchester M13 9PL United Kingdom Rolls-Royce plc Electrical Systems ML-118 PO Box 31 DE24 8BJ Derby England United Kingdom Rolls-Royce plc Strategic Research Centre ML-118 PO Box 31 DE24 8BJ Derby England United Kingdom

ISBN: (纸本)9781849198158

This paper describes the development of an active load for a 100 kVA, ±270 V dc electrical systems evaluation platform for uninhabited autonomous vehicles, typically airborne. The 30 kW, 3 kHz bandwidth active loads emulate in real time the dynamic behaviour at the dc-bus side of typical aerospace equipment, providing a flexible and cost-effective method of evaluating complex system interactions. This paper, which focuses on the design of the high-bandwidth dc-dc converter, covers the thermal design of the power semiconductors for 20 kHz hard-switching operation, the input and output filter design and the converter modelling and control design. All this is supported by experimental results that validate the design.

关键词： Cost effectiveness

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Challenges for wireless sensing in complex engineering applications

Challenges for wireless sensing in complex engineering appli...

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Annual Conference of Industrial Electronics Society

作者： M. Ong H. A. Thompson University Technology Centre in Control & Systems Engineering supported by Rolls-Royce University of Sheffield UK

The cross-disciplinary work in this paper presents the key challenges faced in ongoing efforts to develop novel, fully-scalable, fault-tolerant wireless sensing systems for use in complex and demanding engineering environments where the primary objectives are to optimise performance, enhance equipment health management capability and reduce maintenance costs. Challenging issues need to be addressed in the aspects of performance, fault-tolerance, energy efficiency, survivability in harsh environments and propagation inside/around metal structures. Case studies are presented for the Aerospace and Marine domains that exemplify two very different design objectives that place different demands on embedded wireless solutions. In a novel aerospace application, Active Skin-Friction Reduction systems, implemented using hundreds to thousands of embedded wireless `Smart Patches' to form a `Smart Skin' system, could provide a crucial step change in fuel efficiency and carbon reduction by reducing aerodynamic drag through active modulation and suppression of turbulent airflow. The marine case study examines the potential for embedded wireless technologies to enhance existing marine control and automation systems onboard marine vessels. The advantage offered by wireless sensors over their conventional wired counterparts has significant potential to enhance diagnostic and prognostic capability in both new equipment designs as well as to provide a cost-efficient retrofit solution for legacy systems, therefore creating unique opportunities to improve performance, increase reliability, optimise maintenance schedules and reduce costly down-time.

关键词： Wireless communication Wireless sensor networks Sensors Aircraft Skin Monitoring Fuels

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Wireless sensor research at the rolls-royce control and systems university technology centre

Wireless sensor research at the Rolls-Royce Control and Syst...

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International Conference on Wireless Communication, Vehicular technology, Information Theory and Aerospace and Electronic systems technology (Wireless VITAE)

作者： H.A. Thompson Rolls-Royce Control and Systems University Technology Centre Sheffield UK

The brief of the rolls-royce university technology centre in control and systems engineering at the university of Sheffield's is to perform research and development of engine control and monitoring systems. Over recent years work has been investigating and developing the key components to provide a complete approach to remote asset monitoring, from local networks of wireless sensors gathering information in harsh environments, to data transfer using telecoms, to intensive data analysis using grid computing coupled with sophisticated decision support systems based on CBR. This paper gives an overview of work within the centre on the practical development and testing of wireless sensor technology for test bed engines and long-term asset management.

关键词： Wireless sensor networks Sensor systems control systems Engines Remote monitoring Testing systems engineering and theory Research and development Telecommunication control Data analysis

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control and development of an electrical systems evaluation platform for uninhabited autonomous vehicles

Control and development of an electrical systems evaluation ...

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Annual Conference of Industrial Electronics Society

作者： F. Javier Chivite-Zabalza Andrew J. Forsyth David R. Trainer Julien Calvignac Stephen Long Rebecca Todd School of Electrical and Electronic Engineering University of Manchester Institute of Science and Technology Manchester UK Rolls-Royce Public Limited Company Electrical Systems Strategic Research Centre Derby UK

This paper describes a new control strategy for an aircraft electrical systems evaluation platform. The 100 kVA, experimental facility includes multiple generators and power electronic loads interconnected by a high-voltage dc bus, centrally controlled by a real-time computer and data logging system. The Facility is to allow electrical power management techniques to be developed for future autonomous aircraft. The control of the facility presents important challenges as it has to be flexible, facilitating future expansion, robust, safe, and yet allow the development of advanced control strategies.

关键词： control systems Remotely operated vehicles Mobile robots Aircraft Aerospace electronics Aerospace control DC generators Power generation Power electronics Power system interconnection

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Grid-based decision support with pro-active mobile computing

Grid-based decision support with pro-active mobile computing

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IEEE International Conference on Services Computing (SCC)

作者： M. Ong M. Alkarouri X. Ren G. Allan V. Kadirkamanathan H.A. Thompson P.J. Fleming Rolls-Royce Supported University Technology Centre in Control and Systems Engineering Department of Automatic Control and Systems Engineering University of Sheffield UK

With the emergence of grid computing and service-oriented architectures, computing is becoming increasingly less confined to traditional computing platforms. Grid computing promises the accessibility of vast computing and data resources across geographically dispersed areas. This capability is significantly enhanced by establishing support for mobile wireless devices to deliver access to high-performance computing under demanding circumstances. Access to the grid from mobile devices can be very effective in business environments where users can access the vast computing power and data repositories on the grid while working out on the field. This also enables and encourages collaborative working environments. A grid demonstrator system for distributed aircraft health monitoring already developed and implemented in the UK E-Science Grid project, DAME, is introduced. In this demonstrator, CBR technology for decision support is implemented in a practical framework that enables Grid-based, proactive mobile computing.

关键词： Mobile computing Grid computing Aircraft Handheld computers Computer networks Search engines systems engineering and theory Service oriented architecture Collaborative work Distributed computing

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