Extraction of Dominant Parameters and Proposal of Simplified Formula for Ship Motion in Waves

In this study, the authors proposed explicit formulae of surge, heave, and pitch motion ship in regular waves expressed as function principal hull-form parameters extracted dominant those for simple estimation wave loads structural design. order to develop which have enough accuracy wide range applicability, theoretical approach was adopted based on linear seakeeping theory. process deriving formulae, equations were simplified relationship fluid forces that cancel out each other approximation speed is slow. For both surge motion, 1-DOF model, interaction effects ignored, applicable successfully extracted. On contrast, heave head sea significantly affected by especially full loading conditions. Although mechanism effect factor clarified, it difficult express form extract parameters. However, beam sea, can be parameter straightforwardly. By using parameters, approximated peak value response amplitude operators vertical proposed. It confirmed regardless size type through validation compared with numerical calculation actual hull-forms 77 ships × 2