摘要
通过理论推导和样本分析,研究了舰船噪声调制谱谐波族特征蕴含的结构特性和应用于识别的相关问题。针对螺旋桨叶片数识别问题,建立了螺旋桨空化噪声信号模型。进而根据模型理论上推导了谐波族结构特性的表达式,并对叶片数类空间进行了分析,分析结果可作为专家知识应用于识别。然后,以采用小波包分析提取的大量海上实测目标特征样本为基础对结构特性进行了验证,结果表明:统计平均结果与结构特性表达式完全一致,且78．6％的样本基本符合结构特性。
By theoretical derivation and sample analysis,the structure law of ship radiated-noise demodulation - spectrum harmonic clan feature and correlative questions are investigated. In order to solve the problem of propelle blade-number recognition, the propelle radiated-noise model is built on the basis of five hypotheses. Frther, the mathematical expressions of the structure law are educed by the model.And class space of propelle blade-number is analysed by the mathematical expressions. The analytic results can be applied in recognition as expert knowledge. Finally, the statistic experiment is done by the feature samples that are extracted by using the wavelet packet analysis. The statistical average results are consistent completely with the structure law, and the samples of 78.6% accord with the structure law basically.
出处
《声学学报》
EI
CSCD
北大核心
2007年第1期19-25,共7页
Acta Acustica
