摘要
在对现有舰船辐射噪声信号分布研究的基础上，使用可抑制高斯噪声的高阶谱（双谱和三谱）对其特征进行了分析。分析结果表明，不同类的舰船，其主频范围有其固定的区域。Ｉ类船其主频一般在１２０Ｈｚ以下，Ⅱ类船一般在１３０～３２０Ｈｚ之间。对于双谱图，不同的ω１与ω２的关系，其频谱特征有所不同，对于三谱也有同样的结果。本文中双僧取ω１＝ω２，三谱取ω１＝ω２＝ω３两种关系，以它们最大谱值对应的ω１以及Ｂ（ω１，ω２）中极大值所对应的ω１、ω２组成特征向量．
The features of the ship noises which were recoded by us before are analyzed by the higherorder spectrum after the study of their distribution in this paper. The results show that the differentship noise has different scope of the main frequency. The main frequencies of the first class ships are lessthan 120 Hi, while the second between 130~320 Hz. The different relationships between al and w2correspond to different bispectrum graph. There are the same results in the trispectrum. The featurevector is consist of the w1 which correspond to the maximum bispectrum B(ω1,ωw1) and the maximumtrispectrum B(ωl 1 al, al) respectively and the al andω2 which correspolld to the maximum bispectrumB (w1 w2 ).
出处
《声学学报》
EI
CSCD
北大核心
1999年第6期611-616,共6页
Acta Acustica
基金
国家教委博士点基金
