Study on momentum, heat flux and substance exchange between atmosphere & ocean

在海洋工程领域，惯量陀螺和加速度计被用于运动测量。这种系统是可靠的，但有时对用户来说过于昂贵，功耗大，重量大。在本研究中，我们开发了一种由压电振荡陀螺和加速度计组成的运动传感器系统，该系统成本低，功耗低，重量轻，使用方便。利用研制的运动传感器系统，在冲绳岛南部的海面浮标系统上进行了现场试验。作为研究对象的浮标系统为圆形浮标，排水量50吨，直径7m，系泊在冲绳北纬26度，东经128度。利用研制的运动传感器系统测量了飞机的横摇、摇摆、升沉、横摇、俯仰和偏航运动。实验期限为1995年8月4日至9月6日，为期一个月。利用乘浪式波高仪和高频雷达测量了波浪高度和波型。借助这些波高测量，可以对运动测量的准确性进行评估。基于集总质量法，提出了水面浮筒六自由度运动和系泊索动力学的数值模拟方法。本研究得出的主要结论如下：1)所研制的传感器系统具有良好的角度测量精度。2)加速度计数据的降噪方法对小波高情况下的浪涌、摇摆、升沉、横摇、俯仰和偏航运动的精度有影响。在未来的研究中，将通过实验和相互比较来提高运动传感器系统和数值模拟方法的精度。

In the field of ocean engineering inertia gyro and accelerometers are used for the motion measurements. This kind of system is reliable it is sometimes too expensive, large power consumption and heavy for the user. In the present study we have developed a motion sensor system composed of piezo-oscillation gyro and accelerometers, which is low cost, low power and light weight and very convenient for a user. Field experiments on a surface buoy system have been carried out at the south of Okinawa Island by using the developed motion sensor system. The buoy system used as research object is a circular buoy, of which the displacement is 50 ton and the diameter 7m, moored at latitude 26 degree north and longitude 128 degree east south of Okinawa. The surge, sway, heave, roll, pitch and yaw motions were measured with the developed motion sensor system. The experimental term was one month from August 4th to September 6th, 1995. We have also measured the wave height and the wave pattern by using wave rider type wave height meter and HF radar. The evaluation of the accuracy of the motion measurements was possible by the help of these wave height measurements.We have also developed a numerical simulation method for the six degree freedom motions of surface buoy and dynamics of mooring cable based on the lumped mass method.Main conclusions obtained in this study are as follows ;1) the accuracy of the developed sensor system for angular measurements was excellent.2) the method of noise cut for the data of the accelerometer affects on the accuracy of the surge, sway, heave, roll, pitch and yaw motions in the case of small wave height.The accuracy of motion sensor system and numerical simulation method will be improved through the experiments and mutual comparisons in the future studies.