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

在海洋工程领域，惯性陀螺和加速度计被用于运动测量。这种系统可靠性高，但有时价格昂贵，功耗大，用户负担重。在本研究中，我们开发了一个运动传感器系统组成的压电振荡陀螺仪和加速度计，这是低成本，低功耗和重量轻，非常方便用户。在冲绳南部的水面浮标系统上进行了现场实验，使用开发的运动传感器系统。研究对象是一个排水量为50吨、直径为7米的圆形浮标，系泊在冲绳南纬26度、东经128度。利用研制的运动传感器系统测量了纵荡、横荡、垂荡、横摇、纵摇和偏航运动。实验期为1995年8月4日至9月6日，为期一个月。我们还用乘波式波高计和高频雷达测量了波高和波型。本文还建立了基于集中质量法的水面浮标六自由度运动和系泊缆动力学的数值模拟方法，主要研究结果如下：1.建立了一种基于集中质量法的水面浮标六自由度运动和系泊缆动力学的数值模拟方法; 2.建立了一种基于集中质量法的水面浮标六自由度运动和系泊缆动力学的数值模拟方法。2）加速度计数据的噪声去除方法对纵荡、横荡、升沉、横摇的测量精度有很大影响，在小波高情况下的纵摇和偏航运动，通过实验和相互比较，将在未来的研究中提高运动传感器系统和数值模拟方法的准确性。

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.