曳航船の曳索に生ずる張力及び繋船浮標用錨鎖に生ずる張力
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概要
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In the fore part of this paper the author discused the tension occurred in the towing hawser of ships when they meet regular waves and gusts, assuming that the profile of the towing hawser is a catenary curve and the weight of the hawser per unit length is constant, and neglecting water resistances to the motions of the hawser in water, and the following results are obtained : If so long heavy hawser as T/Te is very large, where T is a period of free oscillation of the hawser and Te is a period of encounter of ships and waves, is used, the tension in the hawser is affected only by winds but by no wave, and even this winds' effect is eafely so small as the hawser can not be cut off, whereas the tension in a short light hawser is much affected by both waves and winds, and especially, if T/Te is unity, the tension is steeply augumented from time to time, and finally the hawser will be cut off, but even their effects either can be minimized by adjusting the phase difference between the towing and towed ships to the encounter waves. or can be free from the synchronism between T and Te, by changing the length of the hawser, the speed and course of the towing ships. It is cleared up that in all cases the smaller towing ship is used, the smaller the effects of waves and winds on the tension in the hawser is. In the after part of this paper the author discussed similarly as above the tension occurred in the chain cables of mooring buoys when ships moored in sea of some depth of water meet regular waves and gusts, and the following results are obtained : If so large heavy chain cables as T/Tw is very large. where T is a period of free oscilation of the chain cables and Tw is a period of waves, is used, the tension in the chain cables is affected only by winds but by no wave, whereas the tension in short light chain cables is much affected by both waves and winds, and especially, if T/Tw is unity, the tension is steeply augumented from time to time, and finally they will be cut off. It is therefore advisable to use as large heavy chain dables as possible in order to be free from the cutting off.
- 社団法人日本船舶海洋工学会の論文
- 1943-08-30