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    A comparative study of delta- and z-based output feedback pole placement adaptive controllers


    Flynn, M. and Ringwood, John (1995) A comparative study of delta- and z-based output feedback pole placement adaptive controllers. In: Proceedings of the Irish DSP and Control Colloquium (IDSPCC '95). Belfast, June 1995, pp. 47-54.

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    Abstract

    This paper selects a popular z-domain adaptive controller based on output feedback pole placement, utilising recursive least squares for system identification. The adaptive algorithm is recast in the delta-domain with a corresponding reformulation of the identification algorithm. Simulation results, incorporating finite word-length effects, are convincingly used to demonstrate the improvement in the delta formulation, when smaller word-lengths are used. Small word lengths are a feature of most popular industrial controllers. In addition, a pilot-scale rig is used as an application example to demonstrate the effectiveness of the delta controller in real-life implementation. The paper concludes by comparing and contrasting the z- and delta-controllers not only in performance terms but also in terms of design complexity, intuitive appeal and cost benefits.

    Item Type: Book Section
    Keywords: z-domain adaptive controller; algorithm; word length; delta-controller;
    Academic Unit: Faculty of Science and Engineering > Electronic Engineering
    Item ID: 9532
    Depositing User: Professor John Ringwood
    Date Deposited: 11 Jun 2018 16:07
    Publisher: Belfast, June 1995
    Refereed: Yes
    URI:

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