Nonparametric Identification of Nonlinear Added Mass Moment of Inertia and Damping Moment Characteristics of Large-Amplitude Ship Roll Motion  

大幅船舶横摇运动非线性附加质量惯性矩和阻尼矩特性的非参数识别

作　　者：S.Pongduang C.Chungchoo P.Iamraksa 

机构地区：[1]Department of Mechanical Engineering,Faculty of Engineering,Kasetsart University,Bangkok 10900,Thailand [2]Department of Nautical Science and Maritime Logistics,Faculty of International Maritime Studies,Kasetsart University,Chonburi 20230,Thailand

出　　处：《Journal of Marine Science and Application》2020年第1期17-27,共11页船舶与海洋工程学报（英文版）

摘　　要：This study aims to investigate the nonlinear added mass moment of inertia and damping moment characteristics of largeamplitude ship roll motion based on transient motion data through the nonparametric system identification method.An inverse problem was formulated to solve the first-kind Volterra-type integral equation using sets of motion signal data.However,this numerical approach leads to solution instability due to noisy data.Regularization is a technique that can overcome the lack of stability;hence,Landweber’s regularization method was employed in this study.The L-curve criterion was used to select regularization parameters(number of iterations)that correspond to the accuracy of the inverse solution.The solution of this method is a discrete moment,which is the summation of nonlinear restoring,nonlinear damping,and nonlinear mass moment of inertia.A zero-crossing detection technique is used in the nonparametric system identification method on a pair of measured data of the angular velocity and angular acceleration of a ship,and the detections are matched with the inverse solution at the same discrete times.The procedure was demonstrated through a numerical model of a full nonlinear free-roll motion system in still water to examine and prove its accuracy.Results show that the method effectively and efficiently identified the functional form of the nonlinear added moment of inertia and damping moment.

关 键 词：Nonparametric identification Ship roll motion Nonlinear damping Added mass Inverse problem 

分 类 号：U661[交通运输工程—船舶及航道工程]