Publicações

Sutulo, S. e Guedes Soares, C. (2005), “An Implementation of the Method of Auxiliary State Variables for Solving Seakeeping Problems”, International Shipbuilding Progress, Vol. 52, nº4, pp. 357-384

An analysis of the problem of the conversion of frequency-domain model for linear seakeeping hydrodynamic forces into the corresponding time-domain representation is carried out. After a short consideration of the memory-functions method, the study is focused on the so-called Method of Auxiliary State Variables whose advantage is that the original mechanical system ship + surrounding fluid having distributed parameters is approximated with a simpler lump-parameters system described by a relatively simple set of linear ordinary differential equations. An algorithm for determination of the coefficients of those equations based on the fractional approximation of the added masses and damping coefficients curves is proposed and tested.

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