EVALUATING THE METACENTRIC HEIGHT OF CONTAINER SHIP INFLUENCE ON GENERATION OF CONDITIONS CONTRIBUTING TO THE OCCURRENCE OF PARAMETRIC ROLLING RESONANCE

The influence of the container ship metacentric height on forming of conditions contributing to the occurrence of parametric rolling resonance is considered. It is noted that in the theory of ship rolling and existing methods of forecasting and taking into account parametric rolling resonance of container ships, the influence of the actual height of the centers of gravity of containers on the metacentric height, and, accordingly, on the parameters of ship rolling, is not considered. In the actual conditions of the ship operation, the rolling parameters are determined in fact, using a stopwatch and eye-measuring. The increase in accidents with the loss of containers overboard, gives every reason to consider that already at the planning stage of the ship voyage, it is critically important to know its actual metacentric height and how it will affect the rolling parameters in the expected hydrometeorological conditions. The purpose of this study is a comparative evaluation of the influence of the metacentric height of a container ship on the forming of conditions that contribute to the occurrence of a parametric rolling resonance. For this purpose, two specific conditions for the occurrence of parametric rolling, in accordance with the provisions of the circular letter of the International Maritime Organization, aimed at ensuring the safety of ships navigation in adverse weather and sea conditions are considered in the paper. The change in the actual metacentric height of the container ship is estimated taking into account the possible values of the actual height of the centers of gravity of the containers. As a result, it is confirmed that the change in the metacentric height of the container ship affects the conditions for the occurrence of parametric rolling. This is expressed in changing in the period of rolling, which depends on the metacentric height, and the period of the waves encounter, which depends, among other things, on the course and speed of the ship. It is concluded that it is necessary to take into account the actual metacentric height of the container to assess the safety of navigation in the expected hydrometeorological conditions of the voyage. It is shown how the combined change in the metacentric height, ship course and speed affects the occurrence of parametric rolling of the container ship.

container ship, container, center of gravity, stability, metacentric height, parametric resonance, rolling

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