楔形海域声矢量场分析

Analysis of the acoustic vector field in a wedge-shaped sea area

海洋环境中的声传播是水声学研究领域的一个经典问题.在传统的研究中,关心的主要是声压场.随着矢量水听器的出现,不仅是声压场,介质质点振速场也受到极大关注.应用虚源法分析了ASA基准楔形模型中谐和点源的三维质点振速场.基于Deane和Buckingham给出的声场声压表达式,文中推导了三维质点振速的积分公式,并应用数值积分的方法计算了声场声压与质点振速,分析了它们的传播损失和相位差以及不同方向声强的衰减过程.结果表明,即使在远距离上,声压与质点振速的相位差并不为零.

Sound propagation in the ocean is a classical underwater acoustics research problem. In traditional studies about sound propagation, researchers are primarily concerned about sound pressure fields. With the advent of acoustic vector hydrophones, particle veloci＇y has begun to receive more attentions from researchers. In this paper, the image source method was used to analyze the three-dimensional particle velocity field in an ASA benchmark wedge with a harmonic point source （Benchmark wedge proposed by Acoustical Society of America）. Integral formulas for three-dimensional particle velocity were derived based on the sound pressure solutions of Deane and Buckingham. Using numerical integration, the transmission losses of sound pressure, particle velocity, and acoustic intensity in the wedge were analyzed and the phase differences between acoustic pressure and particle velocity obtained. The results indicated that the phase difference does not vanish even at long ranges.