Hydroelasticity of large container ships

Safety of ice-strengthened shell structures of ships navigating in the Baltic Sea

“…Therefore, hydroelastic analysis has to be performed (Senjanović et al 2008a(Senjanović et al , 2009a The illustrative numerical example of the 7800 TEU container ship shows that the developed hydroelasticity theory, utilizing the improved 1D FEM structural model and 3D hydrodynamic model, is an efficient tool for application in ship hydroelastic analyses. The obtained results point out that the transfer functions of hull sectional forces in case of resonant vibration (springing) are much higher than in resonant ship motion.…”

“…At the beginning of the analysis, dry natural vibrations have to be calculated, and after that modal hydrostatic stiffness, modal added mass, damping and modal wave load are determined. Finally, wet natural vibrations as well as the transfer functions (RAO) for determining ship structural response to wave excitation are obtained (Senjanović et al 2008a(Senjanović et al , 2009b. 3 STRUCTURAL MODEL BASED ON ADVANCED BEAM THEORY…”

“…where w is hull deflection, ψ is twist angle, y and z are coordinates of the point on ship surface, and z N and z S are coordinates of centroid and shear centre respectively, and ( , , ) = u u x y z is the cross-section warping intensity reduced to the wetted surface (Senjanović et al 2009d). …”

“…Within this theory, the total velocity potential ϕ , in the case of no forward speed, is defined with the Laplace differential equation and the given boundary values. Furthermore, the linear wave theory enables the following decomposition of the total potential (Senjanović et al 2008a) ( )…”

“…Numerical procedure for ship hydroelastic analysis requires definition of structural model, ship and cargo mass distributions, and geometrical model of ship surface (Senjanović et al , 2008a(Senjanović et al , 2009b.…”