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Digital controller fluctuation-source tracing using power spectral decomposition technique

Institute of Nuclear Energy Research, Lung-Tan 3-3, Taiwan, Republic of China

In a digital controller, the outputs may have large fluctuations due to the quantisation noises. If the digital controller is part of a closed-loop system, then the fluctuations will propagate to everywhere and it is difficult to locate the primary source of the fluctuations by studying only the plain data. In this paper, a power spectral decomposition technique is applied to resolve this problem. To make the application viable, the data taken from the digital controller are modified to reflect the cause- consequence calculation-sequence. A successful application in a real digital controller debugging case confirms the usefulness of the technique.

Transactions of the Institute of Measurement and Control, Vol. 9, No. 2, 101-107 (1987)
DOI: 10.1177/014233128700900206


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