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Estimation of Directional Wave Spectrum of Encounter Waves on Board, by an Array of Two Wave-height Meters

通过两个波高计阵列估算船上遭遇波的定向波谱

基本信息

批准号：
62460069
负责人：
YASUDA Akio
金额：
$ 2.24万
依托单位：
Tokyo University of Mercantile Marine
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

The authors tried to develop a simple method to estimate directional wave spectra from a steaming ship, in the present research project.At first in 1987, they designed an array comprised of two wave height meters and tested it in a wave tank. Then they acquired the encounter wave height records off Nojima-zaki by the array whose sensors were installed at the both sides of the bow of a steaming ship. The encounter wave spectra and the frequency dependency of coherency and phase difference between the two wave records are deduced by a 2-channel FFT analyzer. They developed a program on a personal computer to estimate the real wave spectrum and directional wave spectrum using these data which were transmitted from the FFT analyzer.In the conventional estimation at a fixed position, more than three sensors are necessary, allocated with star- or delta-shape. While they proved that estimation was possible from the two series of encounter wave records by the array with an additional information of a velocity vector of a steaming ship, in the method of the present research project.In 1988, they improved the program for the real-time display of the directional wave spectrum. It has not been verified yet on board, however, because the sensors were swept away on the way to the real ocean experiment.Thus they tried another method to estimate the wave direction. They measured the relative wave velocity by a microwave Doppler radar, used in their wave height meter, with rotating the radiation angle azimuthally. Some tests in a wave tank and real sea show the applicability of this method to the estimation of the directional wave spectrum, although there are some problems to be solved.The experiment of real-time display by the wave meter array is almost prepared now and will be executed in near future.

本文试图发展一种简单的方法来估算航行船舶的方向波谱，首先于1987年设计了一个由两个波高计组成的组合，并在波浪水槽中进行了试验。然后，他们通过安装在一艘蒸汽船船首两侧的传感器阵列获得了野岛崎附近的遭遇波高记录。利用双通道FFT分析仪，推导了两条记录的相遇波谱及相干性和相位差的频率依赖关系。他们在个人计算机上开发了一个程序，利用FFT分析仪传输的这些数据来估计真实的海浪谱和方向海浪谱。在固定位置的传统估计中，需要三个以上的传感器，这些传感器被布置成星星或三角形。他们在本研究项目的方法中证明了利用基阵的两个系列的遭遇波记录和航行船舶的速度矢量的附加信息进行估计是可能的，1988年，他们改进了用于实时显示方向波谱的程序。然而，由于传感器在前往真实的海洋实验的途中被冲走，他们还没有在船上得到验证，因此他们尝试了另一种方法来估计波浪的方向。他们通过微波多普勒雷达测量相对波速，该雷达用于波高计，并旋转辐射角。在波浪水槽和真实的海面上进行的试验表明，该方法对海浪方向谱的估计是可行的，但还存在一些问题需要解决。