The rational fraction polynomial (RFP) modal identification procedure is a well known frequency domain fitting technique. To deal with a linear problem, the RFP procedure does not directly minimize the fitting error, i.e, the difference between the experimental and the analytical frequency response function, but a frequency weighted function of it: this causes bias in the modal parameter estimates. In this paper an iteration procedure is proposed which uses the output of the RFP technique as a starting estimate, and minimizes the true fitting error, expressed as a first order Taylor expansion of the identified parameters. Results are quite satisfactory: the fitting error is notably reduced after few iterations. Moreover, less computational modes with respect to the original RFP method are needed to obtain a good fit in a given frequency band.

AN ITERATIVE RATIONAL FRACTION POLYNOMIAL TECHNIQUE FOR MODAL IDENTIFICATION / Carcaterra, Antonio; Walter, D'Ambrogio. - In: MECCANICA. - ISSN 0025-6455. - STAMPA. - 30:1(1995), pp. 63-75. [10.1007/bf00987126]

AN ITERATIVE RATIONAL FRACTION POLYNOMIAL TECHNIQUE FOR MODAL IDENTIFICATION

CARCATERRA, Antonio;
1995

Abstract

The rational fraction polynomial (RFP) modal identification procedure is a well known frequency domain fitting technique. To deal with a linear problem, the RFP procedure does not directly minimize the fitting error, i.e, the difference between the experimental and the analytical frequency response function, but a frequency weighted function of it: this causes bias in the modal parameter estimates. In this paper an iteration procedure is proposed which uses the output of the RFP technique as a starting estimate, and minimizes the true fitting error, expressed as a first order Taylor expansion of the identified parameters. Results are quite satisfactory: the fitting error is notably reduced after few iterations. Moreover, less computational modes with respect to the original RFP method are needed to obtain a good fit in a given frequency band.
1995
curve-fitting; identification; modal analysis; vibrations
01 Pubblicazione su rivista::01a Articolo in rivista
AN ITERATIVE RATIONAL FRACTION POLYNOMIAL TECHNIQUE FOR MODAL IDENTIFICATION / Carcaterra, Antonio; Walter, D'Ambrogio. - In: MECCANICA. - ISSN 0025-6455. - STAMPA. - 30:1(1995), pp. 63-75. [10.1007/bf00987126]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/127124
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