荒天錨泊に関する研究 : 錨泊中の実船における錨鎖張力の測定について

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A vessel anchoring at single anchor in stormy weather will often sheer violently tacking back and forth across the wind repeatedly, and in the worst case, there is a possibility of dragging her anchor. The study of the remedies against dragging the anchor under stormy weather requires the elucidation of shock load of the anchor cable. From this point of view, we would like to report our newly devised cable tension meter and some knowledges we have acquired using this on the experiments on board. The results of our experiments are as follows: 1. Newly devised cable tension meter can be put to practical use in due consideration of easy handling, cheapness and speed etc. 2. Impulsive cable tension in yawing motion occurs not at the time when her heading coincides with the cable direction as has ever been known but much later when the cable direction stands at about 50°to her heading. 3. The cause of one occurrence of impulsive cable tension in yawing motion shoud be considered not only in terms of ship motion but also in terms of 'the snapping phenomenon of the cable in the sea' which is caused by ship motion. In this sense, impulsive cable tention is to be called 'snap load' instead of 'shock load'.
1986-03-25