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

在海洋工程领域中，运动测量主要采用惯性陀螺和加速度计。这种系统是可靠的，有时过于昂贵，功耗大，对用户来说太重。本文研制了一种由压电式陀螺和加速度计组成的运动传感器系统，该系统具有低成本、低功耗、重量轻、使用方便等特点。利用研制的运动传感器系统在冲绳岛南部进行了海面浮标系统的现场试验。作为研究对象的浮标系统是一个圆形浮标，其排水量为50吨，直径7m，停泊在冲绳以南北纬26度，东经128度。利用研制的运动传感器系统测量了船舶的喘振、摇摆、升沉、横摇、俯仰和偏航等运动。试验期为1个月，从1995年8月4日至9月6日。并用行波器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缆动力学的数值模拟方法。1)所研制的测角传感器系统具有较高的精度。2)加速度计数据去噪方法对小波高情况下的垂荡、摇摆、垂荡、横摇、纵摇和偏航运动的精度有很大的影响，运动传感器系统和数值模拟方法的精度将在今后的研究中通过实验和相互比较得到提高。

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.