ESTIMATION OF NONLINEAR ROLL DECAY PARAMETERS USING AN ANALYTICAL APPROXIMATE SOLUTION OF THE DECAY TIME HISTORY

Article type: Research Article

Authors: Bulian, Gabriele

Affiliations: Department of Naval Architecture, Ocean and Environmental Engineering (DINMA), University of Trieste, Italy

Abstract: In this paper an approximate solution for the 1-DOF nonlinear roll decay is proposed. The solution is obtained by means of the averaging technique. The obtained expression is used in a fitting procedure in order to evaluate the parameters of the analytical model. Fitting is based on experimental free decay data for a Ro-Ro hull and a check of the method is performed on simulated roll decay time histories. In order to assess the reliability of the analytical method, a comparison is performed between the results obtained using the analytical approximation and those obtained by direct integration of the differential equation.

Journal: International Shipbuilding Progress, vol. 51, no. 1, pp. 5-32, 2004