水下声道中的反转点会聚区(I)简正波理论

TURNING-POINT CONVERGENCE-ZONES IN UNDERWATER SOUND CHANNEL (I) A NORMAL-MODE THEORY

摘要: 本文用简正波方法讨论水下声道中反转点会聚区的声场。理论分析表明,反转点会聚区声场由大量的简正波同相叠加而成。在一定条件下,反转点会聚区的声强按r^-2衰减,会聚增益与会聚区号数无关,会聚区宽度与会聚区号数成正比,这些理论结果与Hale的实验一致。

Abstract: In this paper, by use of the normal-mode method, the sound field of the turning-point convergence-zones in underwater sound channel is treated.Theoretical analysis shows that the sound field of the turning-point convergence-zone is the superposition of a great number of in-phase normal modes.Under certain conditions, the sound intensity at the turning-point convergence-zone is proportional to r^-2, the convergence-gain is independent to the order of zone and the width of zone is proportional to the order of zone. These theoretieal results are consistent with Hale 's experiment.