Author(s)

P. Hautamaki

Abstract

Simulating dynamic motion of ship in contact with elastic mooring elements by a nonlinear algorithm P. Hautamaki Engineering Mechanics Laboratory, Department of Mechanical Engineering, University of Oulu, Linnanmaa SF-90570 Oulu, Finland ABSTRACT A nonlinear algorithm for simulating dynamic motion of ship in contact with elastic mooring elements was developed. During small time steps all parameters in ship-water-spring system can be taken as linear. Force balance in the system is described by linear second order differential equations for six degrees of freedom. Nonlinearities are taken into account by re-evaluating all affecting forces and mass, damping and stiffness matrices at every time step. Ship is described as a rigid body with three symmetry planes. Water effects are taken into account as added mass and damping coefficients. Solution consists of two parts, which are summed up. In the first part steady, slowly changing and aperiodic forces

Keywords