Total Improvement of Sea-Keeping Quality of Ships

船舶耐波性是由多种要素组成的，必须从整体上对其进行评价。以往对适航质量的研究较多，但从整体的角度进行评价还不够。今天，关于评估耐海品质要素的理论工具似乎已经足够了。因此，最重要的是将这些方法结合起来，使耐波性质量得到全面的提高。在本研究中，我们回顾了以往的耐波性研究成果，并从总体的角度思考了提高耐波性的必要的研究角度。作为结果，我们研究了长期海浪资料与船舶响应和附加波阻的关系，提出了确定海况的方法和海浪谱的新公式。此外，我们还将研究扩展到波浪中的机动运动和浮体的姿态控制，作为提高波浪中的耐波性的例子。这些研究也将有助于全面提高船舶在波浪中的耐波性。

Sea-keeping quality of ships are composed of many kind of elements, and its evaluation must be made from the total view point. Number of researches of sea-keeping quality are made in the past, but evaluation from the total view point is not enough. Today, about the theoretical tool for evaluating the elements of sea-keeping quality seems to be enough. So, the most important point is to make the total improvement of sea-keeping quality combining those methods.In this research, we reviewed the results of the sea-keeping research in the past and considered the necessary point of research for improving the sea-keeping quality from the total point of view. As the results, we investigated in the relation of long-term wave data and ship responses and added wave resistance, proposed the method of determining tfie rough sea condition and new formulation of wave spectra. Furthermore, we extended our research into the maneuvering motion in waves and attitude control of floating body as examples for improving the sea-keeping quality in waves. These investigations will be also useful for total improvement of sea-keeping quality of ships in waves.