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Diagnosis of quantized systems based on a timed discrete-event model

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1 Author(s)
Lunze, J. ; Inst. of Control Eng., Tech. Univ. Hamburg-Harburg, Germany

The paper deals with the diagnosis of continuous-variable systems whose state can be measured only by means of a quantizer. Hence, the online information used in the diagnosis is given by the sequences of input and output events. The diagnostic algorithm uses a representation of the quantized system by means of a semi-Markov process, which provides a timed description of the event sequences generated by the quantized system. The paper describes how the probability density function of the semi-Markov process can be determined for a given quantized system. The diagnostic algorithm can be applied online, because it determines the fault probabilities recursively for the sequence of input and output events. The result is illustrated by a numerical example which concerns a part of a batch process

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Systems, Man and Cybernetics, Part A: Systems and Humans, IEEE Transactions on  (Volume:30 ,  Issue: 3 )