Publications

Guedes Soares, C. (1989), “Transient Response of Ship Hulls to Wave Impact”, International Shipbuilding Progress, Vol. 36, Issue 406, pp. 137-156

In heavy seas ships are subjected to the impact of waves on the bottom and forward sections. these loads induce a transient vibratory response of the ship hull which behaves like a free-free beam interacting with the water. The relative motion between the ship and waves is determined from a strip theory, and the impact force is calculed from the rate of change of momentum of the fluid. The hydrodynamic coefficients are calculatedwith two-dimensional singularity functions. The vibratory response of the ship hull is calculated by modelling it with two-dimensional Timoshenko beam finite elements with a consistent mass formulation, which is used to determinate the mode shapes and natural frequencies. The response is obtained by modal superposition and each modal response is obtained usaing a Newmark integration scheme. Results are presented of example calculations on a cargo ship.

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