基于能量分布重叠率的海浪谱评估方法研究

On evaluation of ocean wave spectra based on energy distribution overlapping rate

海浪谱评估是非规则波的水池造波,波浪及舰船耐波性数值模拟研究中的重要一环,是其效果评价的依据。文中阐述了目前常用的几种海浪谱评估方法的优势与不足,并提出一种基于能量分布重叠率的海浪谱评估新方法。具体为:针对频谱计算其面积重叠率,针对方向谱计算其体积重叠率。试验表明,该方法过程简单、计算快捷、效果较好,是一种简单实用的海浪谱评估方法。在此基础上又针对实际评估更侧重谱形的情况,提出了一种略为复杂而精度更高的使用一阶矩的改进算法。

Evaluation of ocean wave spectra is an important link in wave generator of irregular waves and numerical simulation of waves and seakeeping performance, which can be taken as the basis of their effect assessment. This paper elaborates the advantages and disadvantages of several common methods for the evaluation of ocean wave spectra, and proposes a new method based on the energy distribution overlapping rate. The area overlapping rate is calculated for the frequency spectra and the volume overlapping rate is calculated for the directional spectra. The experimental results show that the proposed method is a simple and practical evaluation method due to the simple process, quick calculation and better effect. Upon it, an improved ifrst-order moment algorithm with higher accuracy and slight complexity has been proposed because the shape of spectra is with more emphasis in practice.