基于随机衰减信号的耐波性谱分析

The Seakeeping Spectral Analysis Based on Random Decrement Signature

提出了一种新的基于随机衰减信号的谱分析方法以用于船模耐波性能分析.该方法通过求解随机衰减信号获得自相关函数,再经快速傅里叶变换计算波浪谱、运动谱以及响应幅算子.将该方法应用于某型船的船模耐波性分析,分别给出了自相关函数、自谱密度函数、频率响应幅算子的结果.通过与规则波试验结果和其他常规谱分析方法的结果比较,验证了新方法的准确有效性.

A new spectral analysis method based on random decrement signature was presented for ship seakeeping performance analysis. The proposed method is to get the auto-correlation functions based on the random decrement signatures which can be transferred to the wave spectrum and ship response spectrum, respectively. The new method was applied to the ship model test data for verification. The results of autocorrelation functions, auto-spectral density functions, and RAOs of the ship model were presented. The comparison with the regular wave results and conventional spectral analysis results validates the proposed method.