海上試運転成績を利用して任意の後進惰力を推定する方法

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The backing ability of ship can only be measured accurately by sea trials. The backing tests, however, are usually limited to the so-called Crash-Stop-Astern tests which consist of the measurements of distance traveled by ship and time-to-stop during backing from the normal full ahead speed by using full backing power. These tests are the most important as an emergency matter. At the same time it will be fundamental for the captain to know the behavior of his ship during backing from any reduced speed while using various astern powers, especially for the safety of ordinary manoeuvres in harbour. There are some methods of calculation based on the propulsive characteristics of ship. However, they are too tedious for the practical navigators even if some simple diagrams can be utilized. The present paper will propose a simple and practical method of prediction for the headreach and stopping time during backing. The proposed method is based on the results of sea trial and on the assumption that the speed curve during backing can be approximated by a straight line. The prediction is made by the following procedures: (1) to estimate the speed curve (linear approximation) when going at reduced speed while using full astern power, (2) to estimate the speed curve when going at full speed while using reduced astern power, (3) and to determine the speed curve when going at reduced speed while using reduced astern power.
社団法人日本航海学会の論文
1976-08-20

海上試運転成績を利用して任意の後進惰力を推定する方法

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