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Application of Parameter Estimation Techniques to a Smart Fuel Metering System

IFAC Proceedings Volumes 2000年第11期33卷 1059-1064页

作者： H Benítez-pérez S.M. Hargrave H.A. Thompson P.J. Fleming Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom Rolls-Royce University Technology Centre in Control Systems Engineering Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom

The application of parameter estimation techniques to monitor the health of a smart fuel metering unit for a gas turbine engine is reported. The process dynamics of this fuel metering unit are multivariable and non-linear. The parameter estimates are used to form fault residual signals that are processed by a fuzzy logic-based evaluation procedure to form health monitoring information. The condition monitoring information resulting from this evaluation is presented in a modified SEVA standard.

关键词： Parameter Estimation Fault Detection Fault Isolation Gas Turbine Fuel control

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PID control for a Distributed System with a Smart Actuator

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IFAC Proceedings Volumes 2000年第4期33卷 499-504页

作者： D. Lee H.A. Thompson S. Bennett Department of Automatic Control and Systems Engineering The University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom Rolls-Royce University Technology Centre in Control and Systems Engineering The University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom Tel: +44-114-222-5236 Fax.: +44-114-273-1729

Recent advances in smart actuator and fieldbus technologies are promoting changes in PID controller design issues. By employing a built-in microprocessor a smart actuator, in general, is capable of self-validation and compensation. In this paper, online retuning of PID controller for a distributed system that contains a smart actuator is explored. The on-line controller retuning is carried out using a set of validation data generated by a smart actuator. The proposed approach is investigated by means of a distributed architecture demonstrator which consists of a set of PCs and a stepper-motor based smart actuator interconnected through fieldbus network.

关键词： PID control actuators nonlinearity fieldbus distributed control

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An Integrated Multi-Disciplinary Optimisation Environment for Distributed Aero-Engine control systems Architectures

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IFAC Proceedings Volumes 1999年第2期32卷 8084-8088页

作者： H.A. Thompson P.J. Fleming Rolls-Royce University Technology Centre in Control and Systems Engineering Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom

Currently, there is considerable interest in adopting distributed control systems for aerospace applications. This is being driven by the perceived advantages: fewer and shorter buses, intrinsic partitioning, smaller control box size, increased health monitoring, increased system flexibility and reduced vulnerability to hazardous events and the advent of smart sensors and actuators. Designers are faced with a highly complex, laborious process of assessing the trade-offs and constraints from many different design disciplines. In this work a design environment is being developed to aid systems engineers in the selection and optimisation of control systems architectures

关键词： Multi-Objective Optimisation distributed systems

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The use of case-based reasoning technology to aid fault isolation in a modern gas turbine engine design

The use of case-based reasoning technology to aid fault isol...

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ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition, GT 1998

作者： Hargrave, S.M. Fleming, P.J. Rolls-Royce University Technology Centre in Control and Systems Engineering Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street SheffieldS1 3JD United Kingdom

ISBN: (纸本)9780791878668

The increasing numbers of commercial decision support tools based on Case-Based Reasoning (CBR) technology reflects the interest in the use of this technology to aid fault diagnosis, not only in gas turbine applications but also in the wider engineering domain. CASSIOPEE from CFM and ARIADNE from British Airways are but two examples of these types of support tool in the civil gas turbine engine arena. They reflect the trend of developing such systems from a historical database of maintenance arisings and necessarily apply to older engine designs. Further characteristics of which include older and less sophisticated aircraft maintenance systems, which provide limited diagnostic information and rely more heavily upon the experience of maintenance personnel to isolate engine faults successfully. It is this diagnostic experience which these CBR tools have attempted to capture and emulate;the case for a CBR-based tool in this instance is well proven. More recent aircraft design have resulted in a more comprehensive on-board maintenance systems to aid maintenance personnel diagnose airframe and engine faults. Such an approach should rely less heavily upon the experience of the maintenance crew to isolate a fault successfully. The paper reports on the design and development of two CBR-based maintenance decision support tools for the rolls-royce Trent 800 and RB21 1- 524 engines. One system is currently undergoing a trial to refine the design of the maintenance case base (the database over which the CBR engine searches to match the current fault symptoms to a historical event). The lessons learned from this field trial and future prospects for such a CBR-based maintenance aid are discussed. Copyright © 1998 by ASME - All Rights Reserved.

关键词： Gas turbines

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Multi-objective optimisation of systems architectures for distributed aero-engine control systems 34th

Multi-objective optimisation of systems architectures for di...

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34th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 1998

作者： Thompson, H.A. Fleming, P.J. Chipperfield, A.J. Rolls-Royce University Technology Centre in Control and Systems Engineering Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street SheffieldS1 3JD United Kingdom

The increasing use of embedded intelligence to produce smart sensors and actuators offers great potential benefits in adopting a distributed control strategy in aerospace applications. There are many advantages to be gained: fewer and shorter buses, intrinsic partitioning, smaller control box size, increased health monitoring, increased system flexibility and reduced vulnerability to hazardous events. However, this has to be traded off against the problems of greater complexity, processor diversity, accessibility, exposure of electronics to severe environments, power distribution, software production costs and management. In this paper how multi-objective optimisation can be applied to this problem for the application of military gas turbine engines is considered. © 1998 by H. A. Thompson.

关键词： Multiobjective optimization

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Multi-objective optimisation of systems architectures for distributed aero-engine control systems

Multi-objective optimisation of systems architectures for di...

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ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition, GT 1998

ISBN: (纸本)9780791878668

关键词： Multiobjective optimization

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Simulation of Distributed Fault Tolerant Heterogeneous Architectures for Real-Time control

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IFAC Proceedings Volumes 1998年第4期31卷 71-76页

作者： H. Benitez-perez H.A. Thompson P.J. Fleming Rolls-Royce University Technology Centre in Control and Systems Engineering Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street Sheffield SI 3JD United Kingdom

Increasingly, there is a move towards in-built intelligence for sensors and actuators to produce "smart" components leading to distributed heterogeneous systems. Of particular interest to safety-critical systems is utilisation of the local intelligence to provide health monitoring, fault detection and fault tolerance. However, crucial to system safety is the ability to predict time delays in the system and analyse their effect on control system perfonnance. For real-time systems the delays associated with communicating diagnostic messages may result in safety deadlines being missed. At present, smart components are integrated in an ad-hoc way. This research is exploring how distributed processing capability can be exploited to improve controller performance and increase fault tolerant capability to create high availability systems for gas turbine engine control.

关键词： Multi-Objective Optimisation Distributed systems

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Distributed Aero-Engine control systems Architecture Selection Using Multi-Objective Optimisation

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IFAC Proceedings Volumes 1998年第4期31卷 77-82页

Over the past 10 years the cost of embedding intelligence into sensors and actuators directly has dramatically reduced. This has led to the recent explosion of smart sensors and actuators available from manufacturers. Initially, these have been developed for the process control industries but increasingly applications in aerospace are being found. Integration of intelligent components is being done in an ad hoc manner by incorporating smart elements in inherently centralised architectures. This paper discusses the application of multi-disciplinary, multi-objective optimisation to a military gas turbine engine control system architecture design where implementation benefits need to be traded off against implementation penalties.

关键词： Multi-Disciplinary Multi-Objective Optimisation Distributed systems

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Multi-Disciplinary Optimisation of Distributed Aero-Engine control System Architectures

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IFAC Proceedings Volumes 1998年第21期31卷 271-276页

作者： H.A. Thompson P.J. Fleming Rolls-Royce University Technology Centre in Control and Systems Engineering University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom

In aerospace, adoption of a distributed control strategy has many advantages such as: fewer and shorter buses, intrinsic partitioning, smaller control box size, increased health monitoring, increased system flexibility and reduced vulnerability to hazardous events. However, this has to be traded off against the problems of greater complexity, processor diversity, accessibility, exposure of electronics to severe environments, power distribution, software production costs and management. This paper discusses the application of multi-disciplinary multi-objective optimisation to military gas turbine engine controller architecture design.

关键词： Multi-Objective Optimisation Distributed systems

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Functional hazard analysis for highly integrated aerospace systems

Functional hazard analysis for highly integrated aerospace s...

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IEE Certification of Ground/Air systems Seminar (Ref. No. 1998/255)

作者： P.J. Wilkinson T.P. Kelly Performance and Control Systems Department Rolls-Royce Commercial Aero Engines Limited Derby UK Rolls-Royce Systems and Software Engineering Department of Computer Science University Technology Centre University of York York UK

Functional Hazard Assessment (FHA) is being increasingly recommended (e.g. by the Aerospace Recommended Practice-ARP 4754 [SAE94]) as a means of performing hazard identification. However, many of the available example applications of this approach (including that given in ARP 4761 [SAE95]) are illustrated either for aircraft-level functions or sub-system functions with obvious and visible functional effects. Our experience is that it can be difficult to apply FHA for lower level aircraft systems (specifically at the level of the engine controller) where, due to the level of complexity and integration with other systems, the overall effects of functional failure are far from obvious. In this paper, we describe the problems we have encountered when applying FHA and the (partial) solutions we have proposed in order to overcome these problems.

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