Study on a prediciton method for coupling motions of tow and towed ships and the towing cable tension in waves

对去年开发的程序进行了扩展，编制了一个新的程序，用于预报规则斜浪中的拖船和被拖船的运动和拖缆张力。为了获得代码的验证数据，在三菱重工长崎研发中心的耐波性和机动盆地进行了坦克测试。通过系统地改变造波机的参数，在测量中捕捉到了波浪周期、波浪方向等因素的影响。利用新编制的程序对斜浪中拖船和被拖船的运动和拖缆张力进行了计算，并与水槽试验结果进行了比较。经验证，计算结果与水箱试验结果基本吻合。该方法可用于波浪中拖曳问题的实际预报。

A new computer code was developed for the prediction of the motions of tow and towed ships and the towing cable tension in oblique regular waves, by extending the code developed in last year. To obtain the validation data for the code, tank tests were conducted at Seakeeping and Maneuvering Basin, Nagasaki R & D center, Mitsubishi Heavy Industries. By systematic change of the wave-maker's parameters, in the measurements, effects of wave period, wave direction and so on were captured. By means of the code newly developed, calculations were made of the motions of tow and towed ships and the towing cable tension in oblique waves, and the results were compared with the tank test results. As a result, it was confirmed that the calculation results roughly agreed with the tank test results. The present method is useful for practical prediction purposes of towing problems in waves.