重心試験時の張索の影響について

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No wind, no tide and calm sea is an ideal condition to carry out inclining experiment, but practically, it is impossible to expect such an ideal condition always. Accordingly, in order to prevent the vessel from shifting by wind and tide, the vessel is moored by wires or ropes. The results analyzed by the data which are taken at such a condition have some errors caused by the tensions of mooring wires. However, as the effects of mooring wires have not been investigated up to this date, author herewith investigated that effects as a statical problem and got few conclusions mentioned below. (1) The effects of mooring wires by moving of shifting weight are negligible small in case of that the external forces of wind and tide are constant. (2) The effects of mooring wires are negligible small in case of that the external forces of wind and tide are constant and height of tide changes in small amount in so far as we encounter. (3) Some effects are considered in case of that the external forces of wind and tide change and the amount of the effects are different in each cases. Necessary attentions to minimize the effects of mooring wires are as follows. (a) The effects of wind and tide force are not depend upon their absolute value but their rate of change. Therefore, it is important to read the deflections of pendulums at the instants when the external forces are same. (b) Usually, it is better that the distance between ship's centre line and mooring points on board are short. (c) Tidal force gives more error than wind force, if the rate of changes of both forces and their directions are same. (d) Comparing with the tests carried out in moored condition and drifted condition by wind (or tide) free from mooring wires, moored condition is better in case of wind and drifted condition is better in case of tide, generally.
社団法人日本船舶海洋工学会の論文
1959-03-25

重心試験時の張索の影響について

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