This paper presents a method for detecting faults in systems with discrete observations. We examine systems representable by a behavioral model. The behavioral model framework characterizes the time evolution of syste...
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This paper presents a method for detecting faults in systems with discrete observations. We examine systems representable by a behavioral model. The behavioral model framework characterizes the time evolution of systems with discrete and continuous states and uncertainty in model parameters. Our method for detecting faults depends on an on-line encoding of the set of trajectories corresponding to a given observation and the dynamics specifications of the behavioral model. This encoding, called an evolution graph, is modified on-line as new observations are received. Faults are detected when the set of encoded trajectories is determined to be empty. This paper presents the modelling framework and discusses the construction and maintenance of the evolution graph.
In this paper we define a class of continuous-time discrete event dynamic systems (DEDS) with two types of discrete-valued input and output signals: condition signals and event signals called Condition/Event systems (...
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In this paper we define a class of continuous-time discrete event dynamic systems (DEDS) with two types of discrete-valued input and output signals: condition signals and event signals called Condition/Event systems (C/E systems). We formally define C/E systems and models of C/E systems that are based on an extension of Petri nets (C/E PNs). We then introduce equivalent C/E PN models for C/E systems resulting from cascade and feedback interconnections via examples. The algorithms that compute these equivalent models can be found in reference [1] The paper concludes with directions for future research.
This paper presents a foundation for an integrated approach to the design of controls and diagnostics in reliable controlsystems. In this approach the control module and diagnostic module of the control system are de...
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The siandard H ∞ control problems has now been solved, in which some rank conditions are imposed on the plant data. These conditions are sometimes not satisfied in practical applications, and it is desirable to obtai...
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The siandard H ∞ control problems has now been solved, in which some rank conditions are imposed on the plant data. These conditions are sometimes not satisfied in practical applications, and it is desirable to obtain general solutions to “non-siandard” problems which do not require these conditions. In this paper, we shall derive a parameterization of the H ∞ controller for a non-standard two-block case which include the state feedback control law as a speial case.
An on-line scheme to failure diagnosis is proposed for dynamic systems under adaptive control, which is designed based on a direct approach to self-tuning regulator. Failure modes occurred in the system are assumed to...
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An on-line scheme to failure diagnosis is proposed for dynamic systems under adaptive control, which is designed based on a direct approach to self-tuning regulator. Failure modes occurred in the system are assumed to be described by unexpected changes in physical parameters of the system. The parameter changes in the controlled system can effectively be detected by using Kullback Discrimination Information (KDI) as an index for model discrimination. In order to decide whether the detected system parameter change is caused by a failure or not, a fuzzy inference approach to failure decision is considered. Some appropriate membership functions which describe fuzzy events of failures are constructed to perform the fuzzy inference. In this way, useful knowledge about failure modes which is available from, e.g., experts can be introduced into the model- based diagnosis technique. Simulation studies of a second-order damped oscillator have been carried out to demonstrate the effectiveness of the method.
Some fundamental results related to binary and multi-level decision logic distributed decision (evidence) fusion (DD(E)F) are presented. New asymptotic performance results for binary and multi-level Neyman-Pearson (N-...
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Some fundamental results related to binary and multi-level decision logic distributed decision (evidence) fusion (DD(E)F) are presented. New asymptotic performance results for binary and multi-level Neyman-Pearson (N-P) DD Farederived. Acomparative resultbetween N-P DDF and Dempster-Shafer DEF in the framework of the Generalized Evidence Processing (GEP) theory is presented under a specific decision rule at the fusion.
In this paper a new method for the computation of the optimal step in gradient algorithms is presented. This method improves the convergence of the gradient algorithms and outperforms any other suboptimal scheme on li...
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In this paper a new method for the computation of the optimal step in gradient algorithms is presented. This method improves the convergence of the gradient algorithms and outperforms any other suboptimal scheme on linear problems while it does not require any additional storage. The method may be also applied to problems with state or control constraints, linear time varying systems and, via linearization, to nonlinear systems as well.
The dual relation between the Model Reference Adaptive control (MRAC) and Identification (MRAI) problems is discussed. A common framework for both problems is established.
The dual relation between the Model Reference Adaptive control (MRAC) and Identification (MRAI) problems is discussed. A common framework for both problems is established.
A solution to the H/sub infinity / mixed sensitivity problem for the SISO (single-input single-output) case is obtained using a Wiener approach to parameterize all equalizing and stabilizing controllers. The controlle...
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A solution to the H/sub infinity / mixed sensitivity problem for the SISO (single-input single-output) case is obtained using a Wiener approach to parameterize all equalizing and stabilizing controllers. The controller which incorporates the LQG (linear quadratic Gaussian) solution has a structure similar to that of D.C. Youla et al. (1976). The system of equations thus obtained is square and has some degree of advantage over previous solutions.< >
A common framework for model reference adaptive identification and control (MRAI and MRAC) is established. The key idea for this common framework is to maintain the same set of equations for describing the parameteriz...
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A common framework for model reference adaptive identification and control (MRAI and MRAC) is established. The key idea for this common framework is to maintain the same set of equations for describing the parameterizations of the plant and the model and to solve the control equation properly for each case (identification or control) for the corresponding tuned system, i.e. the model (identification) or the plant (control). Within this framework, two methods, the MOEM (modified output error method) and the IEM (input error method), for the MRAI and MRAC problems are studied, and global asymptotic stability properties are established.< >
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