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Abstract A random simplex method, which could be used to evaluate the value of components in equivalent circuit from impedance data, is proposed.It is a combination of Monte Carlo method and simplex method.The flowchart for fitting operation is given.The first estimates are arbitrarily assigned to each component, and their final solutions could be obtained through consecutive optimization and approximations.As a result, it is possible to find out simultaneously a number of unknown parameters, especially in case of complicated equivalent circuit, and so it is suitable for processing impedance data when dispersion phenomenon appears.The effect of errors in impedance value on fitting results is examined by using computergenerated impedance data contaminated deliberately by random error.Starting from experimentally measured impedance spectra, the processing is demonstrated for practical systems.The significance of objective function, which is the criterion of fitting, is discussed.
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Received: 25 August 1989
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