ABSTRACT Recent advances in smart actuator and fieldbus technologies are promoting changes in fau... more ABSTRACT Recent advances in smart actuator and fieldbus technologies are promoting changes in fault-tolerant control design issues. In this paper, a smart actuator scheme is implemented based on a low-cost stepper-motor and CAN bus interface. In order to enhance fault-tolerance capability of the control system, the proposed scheme is focused on self-diagnosis and self-compensation of undesirable actuator characteristics produced by faults. Experimental results with a distributed architecture demonstrator show that actuator faults can be accommodated successfully without a redundant actuator by using the proposed smart actuator scheme.
ABSTRACT The design of a fuzzy logic controller for a magnetic bearing is presented. Parameters d... more ABSTRACT The design of a fuzzy logic controller for a magnetic bearing is presented. Parameters defining the controller arc selected with the aid of a multiobjective genetic algorithm. Unexpected results are discovered which show that novel controllers emerge from what is described in this paper as an 'unconstrained" search technique. This leads to questioning of the conventional guiding principles in problem-solving, of correctness, consistency, justifiability, and certainty, which are seen as not entirely helpful when dealing with technologies like fuzzy logic and genetic algorithms. It is demonstrated that controllers derived from the 'unconstrained' search have unique properties that can be exploited.
Proceedings of the 2005 Australasian Workshop on Grid Computing and E Research Volume 44, 2005
ABSTRACT In November 2000 funding of 213M was made available for a new UK e-Science programme, wi... more ABSTRACT In November 2000 funding of 213M was made available for a new UK e-Science programme, with allocations to programmes within each of the UKs Research Councils. Also a Core e-Science Programme was formed as a cross-Council activity to develop and broker generic technology solutions and generic middleware to enable e-Science and form the basis for new commercial e-business software. The Core e-Science Programme was managed by The Engineering and Physical Sciences Research Council (EPSRC), the UK Government's leading funding agency for research and training in engineering, on behalf of all the Research Councils. The first phase of the Core e-Science Programme was structured around six key elements:• A National e-Science centre linked to a network of Regional Grid Centres.• Generic Grid Middleware and Demonstrator Projects• Grid Interdisciplinary Research Projects (IRC)• Support for e-Science Pilot Projects• Participation for International Grid Projects and Activities• Establishment of a Grid Network teamThe DAME (Distributed Aircraft Maintenance Environment) project with funding of 3.5M for three years from January 2002 was one of the first e-Science Pilot Projects, and supported a research team of over 30 staff with partners, the Universities of York, Sheffield, Leeds and Oxford, and from industry Rolls-Royce, Data Systems and Solutions, and Cybula Limited. The project addressed questions of scalability, robustness and the maturity of the emerging Grid technologies for complex industrial engineering applications. These issues were addressed within an industrial deployment scenario provided by Rolls-Royce and Data Systems & Solutions in the domain of remote health monitoring for civil aerospace engines.
A fault-tolerant clock synchronisation technique is presented. In a distributed system the discre... more A fault-tolerant clock synchronisation technique is presented. In a distributed system the discrepancy between a node's view of current time and the rest of a system can cause critical deadlines to be missed. It may also be the cause of many unknown system errors. In fact, many real-time applications, such as redundancy management, synchronous data acquisition and simultaneous triggering of actuators at several nodes, are impossible without such a global reference time. DRTS Ltd have developed and have protected a software-based fault-tolerant clock synchronisation technique for broadcast networks such as CAN. It provides a predictable and reliable service that enables networked system synchronisation to micro-second precision using negligible network bandwidth.
13/42; H04L 7/00; H04L 5/00; G06F 1/12 (57) ABSTRACT A clock synchronization method is described ... more 13/42; H04L 7/00; H04L 5/00; G06F 1/12 (57) ABSTRACT A clock synchronization method is described for a system including N clocks, at least three and at most N-l of Which are master candidate clocks. A start message is broadcast from the fastest master candidate clock. From each of the master candidate clocks, a response message including the local time of receipt of the start message according to the clock in question is broadcast. Using the information rep resenting the times of receipt of the start message, the median master candidate clock is selected and becomes the master clock. The master clock determines the clock syn chronisation error for each master candidate clock, using the information representing the times of receipt of the start message. If any such clock synchronisation error is exces sive the master clock declassi?es the clock in question as a master candidate clock and classi?es another clock as a master candidate clock. This is achieved by broadcasting a classi?ca...
A software-based fault-tolerant clock synchronisation technique is presented. The proposed algori... more A software-based fault-tolerant clock synchronisation technique is presented. The proposed algorithm aims at fault-tolerant clock synchronisation within a subnet involving any number of heterogeneous clocks with or without IEEE1588 clocks. The proposed algorithm is simple, and provides predictable and reliable time references in the presence of faults with grandmaster or network connections.
In November 2000 funding of 213M was made available for a new UK e-Science programme, with alloca... more In November 2000 funding of 213M was made available for a new UK e-Science programme, with allocations to programmes within each of the UKs Research Councils. Also a Core e-Science Programme was formed as a cross-Council activity to develop and broker generic technology solutions and generic middleware to enable e-Science and form the basis for new commercial e-business software. The Core e-Science Programme was managed by The Engineering and Physical Sciences Research Council (EPSRC), the UK Government's leading funding agency for research and training in engineering, on behalf of all the Research Councils. The first phase of the Core e-Science Programme was structured around six key elements:• A National e-Science centre linked to a network of Regional Grid Centres.• Generic Grid Middleware and Demonstrator Projects• Grid Interdisciplinary Research Projects (IRC)• Support for e-Science Pilot Projects• Participation for International Grid Projects and Activities• Establishment ...
Many model-based fault diagnosis approaches have been proposed so far and some of them are applie... more Many model-based fault diagnosis approaches have been proposed so far and some of them are applied in industrial practice. But for modern complex processes, due to the variable nature of faults and model uncertainty, no single approach can diagnose all faults and meet different contradictory criteria. In this paper, the importance of integration of different fault diagnosis schemes in a common framework is emphasised. A service-oriented architecture for the integration is proposed based on Grid technologies. Some implementations of this integration for the gas turbine engine fault diagnosis are presented.
Ports and harbours are very large infrastructure projects which have great impact on the communit... more Ports and harbours are very large infrastructure projects which have great impact on the community, environment and the economy of a country. Ports are not only a vital lifeline link between water-side and land-side traffic, but are also sources of national wealth, pride and concern. Stakeholders now want requirements to be described in a creative, rigorous, and policy-relevant manner and for critical issues such as sustainable development to be incorporated into developments. This paper looks at the issue of sustainable development for ports and harbours as being one of managing complexity and considers how wider requirements may be accommodated. Most of the problems related to sustainability and sustainable development are typically complex and inter-related. It has been shown that the more complex a system the harder it is to manage, but by having insights into the causes of complexity in systems enables decisions to be made actions to be taken where otherwise there may be lost o...
ABSTRACT Ports and harbours are very large infrastructure projects which have great impact on the... more ABSTRACT Ports and harbours are very large infrastructure projects which have great impact on the community, environment and the economy of a country. Ports are not only a vital lifeline link between water-side and land-side traffic, but are also sources of national wealth, pride and concern. Stakeholders now want requirements to be described in a creative, rigorous, and policy-relevant manner and for critical issues such as sustainable development to be incorporated into developments. This paper looks at the issue of sustainable development for ports and harbours as potentially being one of managing complexity, and it considers how holistic system requirements may be accommodated in this process. It also suggests that currently not enough use is being made of stakeholder data – economic, social, and environmental -and that significant operational improvements could result from closer attention to this issue. Most of the problems related to sustainability and sustainable development are typically complex and inter-related. It has been shown that the more complex a system the harder it is to manage, although a certain system complexity is needed for both short and long-term functionality. By having insights into the causes of complexity in systems enables decisions to be made and actions to be taken where otherwise there may be lost opportunities and ultimately reduced profits, or damage to social and environmental networks. Ports have to achieve a harmonious balance between the local community, the environment and economic issues. By applying systems engineering techniques and ideas surrounding complexity management this paper looks at the designing and subsequent management of ports & harbours and in so doing to develop better overall strategies. Research work into a number of operational sub-processes is used to gain insights into where measures of complexity may be further developed.
AbstractWe provide an overview1,2 of the DAME project, and a discussion of the progress made to ... more AbstractWe provide an overview1,2 of the DAME project, and a discussion of the progress made to date on the development of a distributed aeroengine diagnosis environment as a proof of concept demonstration for grid computing. We discuss the development of a ...
ABSTRACT Recent advances in smart actuator and fieldbus technologies are promoting changes in fau... more ABSTRACT Recent advances in smart actuator and fieldbus technologies are promoting changes in fault-tolerant control design issues. In this paper, a smart actuator scheme is implemented based on a low-cost stepper-motor and CAN bus interface. In order to enhance fault-tolerance capability of the control system, the proposed scheme is focused on self-diagnosis and self-compensation of undesirable actuator characteristics produced by faults. Experimental results with a distributed architecture demonstrator show that actuator faults can be accommodated successfully without a redundant actuator by using the proposed smart actuator scheme.
ABSTRACT The design of a fuzzy logic controller for a magnetic bearing is presented. Parameters d... more ABSTRACT The design of a fuzzy logic controller for a magnetic bearing is presented. Parameters defining the controller arc selected with the aid of a multiobjective genetic algorithm. Unexpected results are discovered which show that novel controllers emerge from what is described in this paper as an 'unconstrained" search technique. This leads to questioning of the conventional guiding principles in problem-solving, of correctness, consistency, justifiability, and certainty, which are seen as not entirely helpful when dealing with technologies like fuzzy logic and genetic algorithms. It is demonstrated that controllers derived from the 'unconstrained' search have unique properties that can be exploited.
Proceedings of the 2005 Australasian Workshop on Grid Computing and E Research Volume 44, 2005
ABSTRACT In November 2000 funding of 213M was made available for a new UK e-Science programme, wi... more ABSTRACT In November 2000 funding of 213M was made available for a new UK e-Science programme, with allocations to programmes within each of the UKs Research Councils. Also a Core e-Science Programme was formed as a cross-Council activity to develop and broker generic technology solutions and generic middleware to enable e-Science and form the basis for new commercial e-business software. The Core e-Science Programme was managed by The Engineering and Physical Sciences Research Council (EPSRC), the UK Government's leading funding agency for research and training in engineering, on behalf of all the Research Councils. The first phase of the Core e-Science Programme was structured around six key elements:• A National e-Science centre linked to a network of Regional Grid Centres.• Generic Grid Middleware and Demonstrator Projects• Grid Interdisciplinary Research Projects (IRC)• Support for e-Science Pilot Projects• Participation for International Grid Projects and Activities• Establishment of a Grid Network teamThe DAME (Distributed Aircraft Maintenance Environment) project with funding of 3.5M for three years from January 2002 was one of the first e-Science Pilot Projects, and supported a research team of over 30 staff with partners, the Universities of York, Sheffield, Leeds and Oxford, and from industry Rolls-Royce, Data Systems and Solutions, and Cybula Limited. The project addressed questions of scalability, robustness and the maturity of the emerging Grid technologies for complex industrial engineering applications. These issues were addressed within an industrial deployment scenario provided by Rolls-Royce and Data Systems & Solutions in the domain of remote health monitoring for civil aerospace engines.
A fault-tolerant clock synchronisation technique is presented. In a distributed system the discre... more A fault-tolerant clock synchronisation technique is presented. In a distributed system the discrepancy between a node's view of current time and the rest of a system can cause critical deadlines to be missed. It may also be the cause of many unknown system errors. In fact, many real-time applications, such as redundancy management, synchronous data acquisition and simultaneous triggering of actuators at several nodes, are impossible without such a global reference time. DRTS Ltd have developed and have protected a software-based fault-tolerant clock synchronisation technique for broadcast networks such as CAN. It provides a predictable and reliable service that enables networked system synchronisation to micro-second precision using negligible network bandwidth.
13/42; H04L 7/00; H04L 5/00; G06F 1/12 (57) ABSTRACT A clock synchronization method is described ... more 13/42; H04L 7/00; H04L 5/00; G06F 1/12 (57) ABSTRACT A clock synchronization method is described for a system including N clocks, at least three and at most N-l of Which are master candidate clocks. A start message is broadcast from the fastest master candidate clock. From each of the master candidate clocks, a response message including the local time of receipt of the start message according to the clock in question is broadcast. Using the information rep resenting the times of receipt of the start message, the median master candidate clock is selected and becomes the master clock. The master clock determines the clock syn chronisation error for each master candidate clock, using the information representing the times of receipt of the start message. If any such clock synchronisation error is exces sive the master clock declassi?es the clock in question as a master candidate clock and classi?es another clock as a master candidate clock. This is achieved by broadcasting a classi?ca...
A software-based fault-tolerant clock synchronisation technique is presented. The proposed algori... more A software-based fault-tolerant clock synchronisation technique is presented. The proposed algorithm aims at fault-tolerant clock synchronisation within a subnet involving any number of heterogeneous clocks with or without IEEE1588 clocks. The proposed algorithm is simple, and provides predictable and reliable time references in the presence of faults with grandmaster or network connections.
In November 2000 funding of 213M was made available for a new UK e-Science programme, with alloca... more In November 2000 funding of 213M was made available for a new UK e-Science programme, with allocations to programmes within each of the UKs Research Councils. Also a Core e-Science Programme was formed as a cross-Council activity to develop and broker generic technology solutions and generic middleware to enable e-Science and form the basis for new commercial e-business software. The Core e-Science Programme was managed by The Engineering and Physical Sciences Research Council (EPSRC), the UK Government's leading funding agency for research and training in engineering, on behalf of all the Research Councils. The first phase of the Core e-Science Programme was structured around six key elements:• A National e-Science centre linked to a network of Regional Grid Centres.• Generic Grid Middleware and Demonstrator Projects• Grid Interdisciplinary Research Projects (IRC)• Support for e-Science Pilot Projects• Participation for International Grid Projects and Activities• Establishment ...
Many model-based fault diagnosis approaches have been proposed so far and some of them are applie... more Many model-based fault diagnosis approaches have been proposed so far and some of them are applied in industrial practice. But for modern complex processes, due to the variable nature of faults and model uncertainty, no single approach can diagnose all faults and meet different contradictory criteria. In this paper, the importance of integration of different fault diagnosis schemes in a common framework is emphasised. A service-oriented architecture for the integration is proposed based on Grid technologies. Some implementations of this integration for the gas turbine engine fault diagnosis are presented.
Ports and harbours are very large infrastructure projects which have great impact on the communit... more Ports and harbours are very large infrastructure projects which have great impact on the community, environment and the economy of a country. Ports are not only a vital lifeline link between water-side and land-side traffic, but are also sources of national wealth, pride and concern. Stakeholders now want requirements to be described in a creative, rigorous, and policy-relevant manner and for critical issues such as sustainable development to be incorporated into developments. This paper looks at the issue of sustainable development for ports and harbours as being one of managing complexity and considers how wider requirements may be accommodated. Most of the problems related to sustainability and sustainable development are typically complex and inter-related. It has been shown that the more complex a system the harder it is to manage, but by having insights into the causes of complexity in systems enables decisions to be made actions to be taken where otherwise there may be lost o...
ABSTRACT Ports and harbours are very large infrastructure projects which have great impact on the... more ABSTRACT Ports and harbours are very large infrastructure projects which have great impact on the community, environment and the economy of a country. Ports are not only a vital lifeline link between water-side and land-side traffic, but are also sources of national wealth, pride and concern. Stakeholders now want requirements to be described in a creative, rigorous, and policy-relevant manner and for critical issues such as sustainable development to be incorporated into developments. This paper looks at the issue of sustainable development for ports and harbours as potentially being one of managing complexity, and it considers how holistic system requirements may be accommodated in this process. It also suggests that currently not enough use is being made of stakeholder data – economic, social, and environmental -and that significant operational improvements could result from closer attention to this issue. Most of the problems related to sustainability and sustainable development are typically complex and inter-related. It has been shown that the more complex a system the harder it is to manage, although a certain system complexity is needed for both short and long-term functionality. By having insights into the causes of complexity in systems enables decisions to be made and actions to be taken where otherwise there may be lost opportunities and ultimately reduced profits, or damage to social and environmental networks. Ports have to achieve a harmonious balance between the local community, the environment and economic issues. By applying systems engineering techniques and ideas surrounding complexity management this paper looks at the designing and subsequent management of ports & harbours and in so doing to develop better overall strategies. Research work into a number of operational sub-processes is used to gain insights into where measures of complexity may be further developed.
AbstractWe provide an overview1,2 of the DAME project, and a discussion of the progress made to ... more AbstractWe provide an overview1,2 of the DAME project, and a discussion of the progress made to date on the development of a distributed aeroengine diagnosis environment as a proof of concept demonstration for grid computing. We discuss the development of a ...
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