Nonlinear roll damping of a barge with and without liquid cargo in spherical tanks

作     者：Wenhua Zhao Mike Efthymiou Finlay McPhail Sjoerd Wille 

作者机构：Faculty of EngineeringComputing and MathematicsThe University of Western Australia35 Stirling HighwayCrawleyWA 6009Australia Shell Global Solutions BV(Shell)Kessler Park 12280 ABRijswijkThe Netherlands 

出 版 物：《Journal of Ocean Engineering and Science》 (海洋工程与科学（英文）)

年 卷 期：2016年第1卷第1期

页      面：84-91页

核心收录：

学科分类：07[理学] 0701[理学-数学] 070101[理学-基础数学] 

基　　金：Shell University of Western Australia, UWA Shanghai Jiao Tong University, SJTU 

主　　题：LNG carrier Nonlinear roll damping Liquid cargo motion Spherical tanks Model test. 

摘      要：Damping plays a significant role on the maximum amplitude of a vessel’s roll motion,in particular near the resonant *** is a common practice to predict roll damping using a linear radiation-diffraction code and add that to a linearized viscous damping component,which can be obtained through empirical,semi-empirical equations or free decay tests in calm ***,it is evident that the viscous roll damping is nonlinear with roll velocity and *** liquid cargo motions inside cargo tanks also contribute to roll damping,which when ignored impedes the accurate prediction of maximum roll *** this study,a series of free decay model tests is conducted on a barge-like vessel with two spherical tanks,which allows a better understanding of the nonlinear roll damping components considering the effects of the liquid cargo *** examine the effects of the cargo motion on the damping levels,a nonlinear model is adopted to calculate the damping *** liquid cargo motion is observed to affect both the linear and the quadratic components of the roll *** flow memory effect on the roll damping is also *** nonlinear damping coefficients of the vessel with liquid cargo motions in spherical tanks are obtained,which are expected to contribute in configurations involving spherical tanks.