摘要
在双螺旋桨舰船噪声包络建模的基础上,研究了双桨目标调制谱谐波族特征的结构问题,并对海试中发现的"伪桨"现象进行了分析,从理论上解释了谐波族结构发生畸变的原因。进一步采用模型基特征提取技术,研究了基于模型匹配的舰船螺旋桨噪声特征精细分析方法,提取了舰船噪声包络波形精细结构特征。海试信号分析表明,舰船螺旋桨噪声特征精细分析有助于提取更多的螺旋桨物理特征及周期性调制信息,进而提高舰船目标的识别率。
The structure question about feature of harmonic clan for demodulation-spectrum was studied by using the envelope model of noise radiated from double propeller. The pseudo-propeller phenomenon discovered in a sea test was analysed, and structural aberration of harmonic clan was explained theoretically. Moreover, the fine analysis method of propeller noise feature was investigated by using the model-based technology, and the fine structural feature of envelope waveform was obtained by using the method. The analysis results of ship noise show that the fine analysis of propeller noise feature redound to obtain more physics feature and periodic modulation information of the propeller, and to improve recognition rate of the ship target.
出处
《声学学报》
EI
CSCD
北大核心
2009年第5期401-407,共7页
Acta Acustica
基金
国家"十一五"预研基金资助项目
