Abstract

The title paper [1] 2 is intended to provide a method for simulating (via digital computation) the second-order slowly varying wave drift force acting on a ship in waves. The Oppenheim and Wilson method is based upon obtaining a digital time history representation when using known information about the power spectrum of this drift force. The main concern indicated in their paper is the requirement to provide the drift force time history for use in a digital simulation of a moored floating vessel which makes use of a variable time step integration technique. The necessity for obtaining such disturbing forces in the proper form when applying a variable time step integration technique is well understood, in view of similar experience using such variable time step integration procedures in different simulation studies covering both high-frequency and relatively low-frequency motion phenomena (for example, [2, 8]).

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