The complex acoustic intensity was derived and analyzed for a far-field harmonic point source in Pekeris waveguide.The results of the study show that the instantaneous acoustic intensity flux for eazh normal mode is the sound energy distribution of a pair of plane waves with the same amplitude and initial phase difference of π in the medium:the interference of each normal mode results in the existence of the horizontal active and reactive acoustic intensity;in the vertical direction,the cancellation phenomenon of acoustic energy flux exists in each normal mode for oneself,but interference of each other leads to the nonzero active acoustic intensity;a 3-D acoustic vector sensor can not identify the point source elevation angle of the radiation harmonic signal by the averaged acoustic intensity method in the Pekeris waveguide.Simulations were conducted by the normal mode code.%推导并分析了Pekeris波导中单频点源在远场条件下的复声强.研究结果表明,在Pekeris波导中,每号简正波模式对应的瞬时声强是2幅值相等、原点处相位差为π的上下行平面波在介质空间中传播形成的瞬时能量分布;各号简正波的相互干涉作用使得水平方向上同时存在有功声强和无功声强;垂直方向上,各号简正波自身存在声能流对消现象,但彼此的相互干涉作用导致有功声强不为零.单个三维矢量水听器在Pekeris波导中利用平均声强法无法确定辐射连续单频信号的点源俯仰角.最后通过声场计算程序进行仿真.
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