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

在实验波浪水槽中进行船舶运动的测量，不仅对理论的评价，而且对捕捉理论无法估计的现象都具有重要意义。另一方面。根据造波技术的进展。在这样的长水池中产生更逼真的波浪场是可能的，但对船舶大运动包括大平面运动的测量系统还没有建立起来。因此，我们的目标是发展一种利用光学装置测量和分析船舶在不规则方向波中运动的方法。第一年，我们研制了光学遥测系统，第二年，我们研制了光学遥测系统，第三年，我们研制了光学遥测系统，第四年，我们研制了光学遥测系统，第五年，我们研制了光学遥测系统，第六年，我们研制了光学遥测系统，第七年，我们研制了光学遥测系统，第八年，我们研制了光学遥测系统，第九年，我们开发了一套计算程序，从所获得的数字数据中估算出六自由度的运动，最后通过静水和不规则波中的模型试验对我们的系统进行了测试。模型选用自由航行的全船和长半潜式海洋结构物，波浪选用规则波、长峰不规则波和方向谱波，计算结果表明，本系统是可靠的。

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.