Modern Production Paradigms, supported by state-of-art developments in IT, present major opportunities for the effective implementation of sustainable shop floors. With an increased focus in seamless system reconfigur...
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ISBN:
(纸本)9781424468508
Modern Production Paradigms, supported by state-of-art developments in IT, present major opportunities for the effective implementation of sustainable shop floors. With an increased focus in seamless systemreconfiguration most proposals advocate the use of modular and distributed architectures that are dynamic compositions (adaptable and evolvable structures) of cooperating self-contained entities that interact using complex communication patterns with enhanced semantics. These design principles introduce significant diagnostic challenges. The distributed and contained nature of the information renders collective fault events harder to track. Furthermore, current approaches that are adjusted to a more conservative logic-based control, do not provide an adequate response to this problem. This paper proposes an approach to capture the network dynamics of faults in the emergent domain of Evolvable Production systems (EPS) which implements and extends the before-mentioned characteristics.
A novel approach for integrated fault detection, diagnosis and reconfigurable controlsystems design against actuator faults is proposed. The scheme is based on a two-stage adaptive Kalman filter for simultaneous stat...
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A novel approach for integrated fault detection, diagnosis and reconfigurable controlsystems design against actuator faults is proposed. The scheme is based on a two-stage adaptive Kalman filter for simultaneous state and fault parameter estimation, statistical decisions for fault detection, and activation of controller reconfiguration. Using the information from the fault detection and diagnosis scheme, the reconfigurable feedback controller is designed automatically based on an eigenstructure assignment technique. To eliminate the steady-state tracking error, a reconfigurable feedforward controller is also incorporated using a command generator tracker technique. The following fault types and input signals are considered: abrupt and incipient, single, multiple and consecutive faults, constant and arbitrarily varying reference inputs. The effectiveness and the superiority of the proposed approach are demonstrated using an aircraft example.
faultdiagnosis of control engineering systems can be based upon the generation of signals which reflect inconsistencies between the fault-free and faulty system operation - so-called residual signals. This paper outl...
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faultdiagnosis of control engineering systems can be based upon the generation of signals which reflect inconsistencies between the fault-free and faulty system operation - so-called residual signals. This paper outlines some recent approaches to the generation of residual signals using methods of integrating quantitative and qualitative system knowledge, based upon AI techniques.
The development of the supervisory control architecture to investigate the system in the biomedical control field was discussed. Such areas were characterized by the patient to patient variability to drug sensitivity,...
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The development of the supervisory control architecture to investigate the system in the biomedical control field was discussed. Such areas were characterized by the patient to patient variability to drug sensitivity, noise and faulty instruments readings, alarm situation and the need for improvement in the controller performance. The supervisory control monitor the control performance, such as the start up and shut down procedures, estimating the patient sensitivity to the drug and switching the controller on or off. The introduction of supervisory level into a systems architecture gives more robust control structure and translate the requirements given by the users.
The introduction of a supervisory level into a systems architecture gives a more robust control structure, whereby one can translate the requirements given by the user to a knowledge-base for use by the controller. It...
The introduction of a supervisory level into a systems architecture gives a more robust control structure, whereby one can translate the requirements given by the user to a knowledge-base for use by the controller. It also provides a complete system structure for fault detection and diagnosis. As shown in this paper, it has been implemented successfully for a medical system and provides generic control tasks for keeping the process on-line within acceptable behaviour boundaries. If a fault occurs in the process, the control task passes through a primary direct control regime first, then an adaptive control regime, and finally a faultdiagnosis regime, each attempting to drive the system behaviour into an acceptable zone.
faultdiagnosis of control engineering systems can be based upon the generation of signals which reflect inconsistencies between the fault-free and faulty system operation-so-called residual signals. This paper outlin...
faultdiagnosis of control engineering systems can be based upon the generation of signals which reflect inconsistencies between the fault-free and faulty system operation-so-called residual signals. This paper outlines some recent approaches to the generation of residual signals using methods of integrating quantitative and qualitative system knowledge, based upon AI techniques.
faultdiagnosis of control engineering systems can be based upon the generation of signals which reflect inconsistencies between the fault-free and faulty system operation - so-called residual signals. This paper outl...
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faultdiagnosis of control engineering systems can be based upon the generation of signals which reflect inconsistencies between the fault-free and faulty system operation - so-called residual signals. This paper outlines some recent approaches to the generation of residual signals using methods of integrating quantitative and qualitative system knowledge, based upon AI techniques.
The paper presents the results of work being undertaken as part of the U.K. contribution to an International Energy Agency research project (Annex 34) concerned with computer-aided fault detection and diagnosis in rea...
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ISBN:
(纸本)085296708X
The paper presents the results of work being undertaken as part of the U.K. contribution to an International Energy Agency research project (Annex 34) concerned with computer-aided fault detection and diagnosis in real buildings. The aim of the project is to develop and test software tools, which are based on existing methods of fault detection and diagnosis, for analysing the performance of heating, ventilating and air-conditioning systems. The development of a tool, which can automate the commissioning of air-handling units in large-scale air-conditioning systems, is considered in this paper. The presence of faults is detected by a fuzzy model-based faultdiagnosis scheme which uses generic reference models to describe the behaviour of the plant when it is operating correctly and when one of a predefined set of faults has occurred. The paper discusses practical issues such as the integration of the commissioning tool and the building energy management system, the automatic reconfiguration of the control strategy to implement open-loop commission tests, the automatic generation of the test sequences, and the presentation of the diagnostic results to the user. Experimental results are presented that demonstrate the use of the tool to remotely commission the cooling coil of an air-handling unit in a commercial office building.
faultdiagnosis of control engineering systems can be based upon the generation of signals which reflect inconsistencies between the fault-free and faulty system operation-so-called residual signals. This paper outlin...
faultdiagnosis of control engineering systems can be based upon the generation of signals which reflect inconsistencies between the fault-free and faulty system operation-so-called residual signals. This paper outlines some recent approaches to the generation of residual signals using methods of integrating quantitative and qualitative system knowledge, based upon AI techniques.
The proceedings contains 10 papers from the 1991 ieecolloquium on faultdiagnosis in Process systems. Topics discussed include: rapid prototyping of sensor fault-tolerant traction controlsystem;faultdiagnosis in mu...
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The proceedings contains 10 papers from the 1991 ieecolloquium on faultdiagnosis in Process systems. Topics discussed include: rapid prototyping of sensor fault-tolerant traction controlsystem;faultdiagnosis in multi-channel clinical analyzers;faultdiagnosis in industrial process manufacturing;multivariate statistical process control;artificial neural network applications;knowledge based systems;faultdiagnosis of a nuclear processing plant;tool condition monitoring;fault protection for subsea pipelines;and fault tolerant control in satellite controlsystems.
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