Pekeris波导中简正波声强流及其互谱信号处理  

Normal mode acoustic intensity flux in Pekeris waveguide and its cross spectra signal processing

作　　者：惠俊英[1] 孙国仓 赵安邦[1] 

机构地区：[1]哈尔滨工程大学水声工程学院,哈尔滨150001

出　　处：《声学学报》2008年第4期300-304,共5页Acta Acustica

基　　金：国防科技重点实验室基金(9140C200101080C2005);哈尔滨工程大学基础研究基金(HEUFT07072)资助项目

摘　　要：探讨了Pekeris波导中声压场和质点振速场的联合描述,尤其关注垂直声强流的分析。研究表明,由于各阶简正波的干涉作用,水平和垂直声强流均既有有功分量,亦有无功分量。低频声场的垂直声强流的无功分量虽不参与声能的输运,当单个声矢量传感器做适当放置后却可用以判断声源的特定深度。这对于矢量信号处理是有意义的。给出了声压和质点振速联合互谱处理进行目标判别的算法。The layered media normal mode theory has been well established in the middle of the last century, but few attentions have been paid to the particle velocity field. The combined descriptions of the pressure field and particle velocity field in Pekeris waveguide, especially the vertical acoustic intensity flux are proposed. The result of the study shows that either the horizontal or vertical acoustic intensity flux has both active and reactive component because of the interference between the normal modes. When an acoustic vector sensor is placed appropriately, the reactive component of the vertical acoustic intensity flux in low frequency acoustic field can be used to tell the source＇s specified depth, although it can＇t transport energy. Then the reactive component of the vertical acoustic intensity flux is of importance for vector signal processing. The pressure and particle velocity cross spectra signal processing algorithm is proposed to distinguish the targets.

关 键 词：信号处理 简正波 强流 互谱 波导 声矢量传感器 质点振速 无功分量 

分 类 号：O423[理学—声学]