DEVELOPMENT OF A MEASURERING AND ANALYZING SYSTEM FOR LARGE AMPLITUDE SHIP MOTION IN IRREGULAR DIRECTIONAL WAVES.

实验波舱中船舶运动的测量不仅对理论评价有重要意义，而且对捕捉理论无法估计的现象也有重要意义。另一方面。根据波浪发生技术的进展。在这样长的水槽中产生更真实的波场成为可能，但目前还没有建立起包括大平面运动在内的船舶大运动测量系统。因此，我们的目标是开发一种利用光学装置测量和分析船舶在不规则定向波中的运动的方法。第一年，我们开发了一个光学遥测系统，最后一年，我们开发了计算代码，用于从获得的数字数据估计六自由度运动。最后，我们通过静水和不规则定向波的模型实验对系统进行了测试。作为模型，我们选择了自由运行的全船结构和长半潜式近海结构。作为波，我们使用规则波、长波峰不规则波和定向频谱波。至于结果，我们的系统被证实是可靠的，符合我们最初的目的。

It is very important to measuring the ship motions in experimental wave tank for not only to the evaluation of theory but also to catch those phenomena that can not be estimated by the theory. on the other hands. according to the progress of wave generating techniques. more realistic wave fields became possible to be generated in such a long tank but the measuring system for ship's large motions including the large plane motion are not established yet.So, we aimed to develop a measuring and analyzing method for ship motion in irregular directional waves by using optical device.At the first year, we developed an optical remote measuring system and this last yearl, we developed calculation code for estimating the six degrees freedom motion from the obtained digital data.In the final we tested our system by conducting model experiments in still water and in irregular directional waves. As model we selected free running full ship and long and semisubmersible offshore structure.As wave we used regular, long crested irregular waves, and directional spectrum waves.As for results, our system was confirmed to be a reliable for our original purpose.