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Journal of Intelligent Material Systems and Structures
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Comparative Methods for the Derivation of In Flow Electrical Characteristics of Electro-Rheological Fluids

A. Hosseini-Sianaki

Department of Mechanical and Process Engineering University of Sheffield P.O. Box 600 Sheffield, S1 4DU, U.K.

R. Firoozian

Department of Mechanical and Process Engineering University of Sheffield P.O. Box 600 Sheffield, S1 4DU, U.K.

D.J. Peel

Department of Mechanical and Process Engineering University of Sheffield P.O. Box 600 Sheffield, S1 4DU, U.K.

W.A. Bullough

Department of Mechanical and Process Engineering University of Sheffield P.O. Box 600 Sheffield, S1 4DU, U.K.

Results are presented from two identification exercises which have been used to determine the resistance and capacitance values of a typical electro-rheological fluid. Simulated data, in which the parameter values are known a-priori, are employed to compare the two methods with regard to both accuracy and computational efficiency. The experimental data analysed are from a parallel plate flow mode valve restrictor. Both ap proaches produce similar results over the operating range of moderate to high excitation frequency, but yield substantially different results at low frequencies. Possible reasons for these inconsistencies and methods for resolving the problems are discussed. Amongst these problems noise on the processed signal is a major factor.

Journal of Intelligent Material Systems and Structures, Vol. 3, No. 1, 96-114 (1992)
DOI: 10.1177/1045389X9200300106
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