OPTIMISATION OF ORTHOGONAL POLYNOMIAL SIGNALS FOR DIRECT IDENTIFICATION OF EQUIVALENT CIRCUIT PARAMETERS

Marek Niedostatkiewicz, Romuald Zielonko

Abstract

The equivalent electrical circuits (mostly multielement two-terminals) are the common used method of modelling many technical and biological objects. The parameter identification of this kind of circuits is important in testing and diagnosis of many objects. The paper presents a time-domain identification method dedicated mainly for monitoring and diagnosis of anticorrosion coating. The method is based on applying a sequence of polynomials and measuring the object's response at the end of every signal in the sequence. Equivalent circuit parameters are calculated directly from responses using analytical equations, determined by impedance circuit topology. In the paper the optimisation of non-conventional Gegenbauer and Jacobi polynomial signals against the criteria of stationary error and uncertainty propagation is presented.

Keywords

anticorrosion coating diagnosis, parameter identification, non-conventional signals

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IMEKO-WC-2009-TC21-258.pdf

DOI

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IMEKO TC

TC21 - Mathematical Tools for Measurements

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