Publications

Sutulo, S. and Guedes Soares, C. (2007), “Contribution of Higher-Order Harmonics for Estimating Manoeuvring Derivatives from Oscillatory Tests”, International Shipbuilding Progress, Vol. 54, N.º 1, pp. 1-24

The process of estimation of manoeuvring derivatives from captive model tests is analyzed and it is demonstrated that, contrary to common belief, all important information concerning quasi-steady force components can be extracted by means of only two terms of the Fourier expansions of the output time histories of force measurements: the mean values and the first-order out-of-phase coefficient values. Additional involvement of the second-order coefficients, as shown with an example, does not alter substantially the estimates of the regression coefficients and apparently does not make the resulting regression model more certain and accurate.

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