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The leap-layer is assumed to consist of two isovelocity water layers. The expressions of the law on the decay of the averaged sound intensity with range are derived when the source and receiver are laid in the same isovelocity water layer or in two diffrent isovelocity water layers respectively. The results show that there is apparent depth constitution in the sound field in the leap-layer. The theoretical results agree quite well with the practical data. 相似文献
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It has been observed experimentally that the signal waveforms in shallow water with thermocline have regular multipath structures and the waveforms of received signals are strongly dependent on the depths of the source and the receiver. When both the source and the receiver are located above the thermocline, each sigrtal received consists of a train of almost equispaced wave-packets. The time interval iswhere H, d, C0 and C1 are parameters of the sound velocity profile. When the source is below the thermocline and the receiver is above, the time intervals between wave-packets are τ and (T- τ)where η is the distance from the source to the bottom.These observed regularities of waveforms may be used for monitoring the fluctuation of the thermocline in shallow water. 相似文献
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海水中的声速分布常存在如图1所示的负梯度跃变层(简称负跃层或跃变层)。负跃层对声传播具有“屏蔽”作用:即若声源放在负跃层之上的某点处,则在负跃层之下且离声源较远的任意点处的声强极为微弱,反之亦然。这种负跃层的“屏蔽“作用常为潜艇的活动所利用,所以具有重要的战术意义。因此,找出具有负跃层浅海中的平均声强随距离的下降规律,不仅在理论上很有意义,而且是密切联系实际的重要课题。 相似文献
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