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ESTIMATION OF MODAL PARAMETERS THROUGH A NON-LINEAR OPTIMISATION TECHNIQUE

✍ Scribed by LUIZ FERNANDO LOMBA ROSA; CARLOS MAGLUTA; NEY ROITMAN

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 183 KB
Volume: 13
Category: Article
ISSN: 0888-3270
DOI: 10.1006/mssp.1998.1207

No coin nor oath required. For personal study only.

✦ Synopsis

The estimation of modal parameters through Goal Programming, an optimisation technique, is presented. The estimation, performed in the frequency domain, seeks to minimise the total squared error between experimental and estimated values of the frequency response functions. Its purpose is to obtain greater accuracy than classical methods in complex cases (highly damped systems, systems of high modal density and noisy experimental data). Numerical simulations that reproduce complex practical applications were carried out with a set of frequency response functions. An experimental test with a small-scale model of an o!shore "xed platform was also analysed. The results obtained through the developed algorithm were compared with those obtained through a classical modal parameter estimation method*the orthogonal polynomials method.

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