Equivalent Added Mass of Ship in the Collision

A comparative analysis of the fluid-structure interaction method and the constant added mass method for ice-structure collisions

“…Motora et al [7] investigated the validity of Minorsky's assumption of constant added mass in a series of model tests and concluded that this assumption is only reasonable when the duration of the collision is very short. For collisions with longer durations, the value of the added mass increases and can reach a value that is equal to or even greater than the ship's own mass.…”

“…As the duration of the impact in the test was very short, i.e., approximately 22 ms, the added mass coefficients for infinite high frequency can be used [7]. The value of 0.35 for the ice mass and of 0.33 for the floater obtained by WADAM (see Figs.…”

“…For instance, hydrodynamic forces cause a struck ship or floating body to move before the actual impact, which affects its response to the collision [6]. It is necessary to take into account the hydrodynamic effect of the surrounding water when dealing with the absorbed energy in collision [7].…”

Structural response of collision between bow and ice row

“…According to the characteristics of ice platoon, it is easy to see that the thickness, velocity and properties of ice platoon all affect the structural response of the collision to different degrees. In this paper, ls-dyna is used to simulate the collision between ships and ice platoon, Under certain other conditions [2], starting from the three aspects of ice row thickness, motion state and single impact parameter change of physical properties, The differences in damage deformation, collision force and velocity variation of ships under different collision conditions are compared and studied, The influence of the above factors on the collision between the two is summarized, which provides a reference for improving the crashworthiness of ships and the design of anti-ice loading capacity.…”