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Gain calculation method for caustic convergence region under deep sea complete sound channel based on ray normal mode theory

A caustics and theoretical technology, which is applied in the field of caustics convergence area gain calculation under the deep-sea complete channel, and can solve problems such as the reduction of the convergence area gain.

Active Publication Date: 2020-04-07
HARBIN ENG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the gain of the convergence zone near the sea surface is significantly reduced at a long distance, and proposes a method for calculating the gain of the caustics convergence zone under the complete sound channel in the deep sea based on the ray normal wave theory

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  • Gain calculation method for caustic convergence region under deep sea complete sound channel based on ray normal mode theory
  • Gain calculation method for caustic convergence region under deep sea complete sound channel based on ray normal mode theory
  • Gain calculation method for caustic convergence region under deep sea complete sound channel based on ray normal mode theory

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Embodiment

[0059] Analyzing the Munk profile, a typical deep-sea sound velocity profile, the sound velocity expression of the Munk profile is:

[0060] c(z)=c 0 {1+ε[e -η -(1-η))) (1)

[0061] Among them, η=2(z-z 0 ) / B, z 0 Is the depth of the channel axis, B is the waveguide width, c 0 Is the minimum value of sound speed, and ε is the magnitude of deviation from the minimum value. For a typical Munk model, the parameters are: B=1000m, z 0 =1000m, c 0 =1500m / s, ε=0.57×10 -2 . Sound velocity profile like figure 1 Shown.

[0062] The sound source depth is 300m, and the environment at a sea depth of 6000m is selected for simulation. The signal is filtered at one-third octave of the center frequency of 200Hz. Using the sound field calculation software, the frequency range is 178-224Hz, with 1Hz as the step size. Calculate the sound field separately for each frequency point, then use equation (4) to calculate the frequency average sound intensity, and then calculate the frequency average propagat...

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Abstract

The invention provides a gain calculation method for a caustic convergence region under a deep sea complete sound channel based on a ray normal mode theory. The gain calculation method is characterized in that under the deep sea complete sound channel condition, a typical deep sea Munk sound velocity profile situation is analyzed by using a ray normal mode theory, and then an expression of the sound pressure is obtained; the sound intensity is calculated according to the expression of the sound pressure; the average sound intensity value of the energy is calculated in the bandwidth of the 1 / 3octave of the central frequency; the average propagation loss value of the energy is calculated; the spherical wave propagation loss value at the caustics of the convergence region is calculated; andthe energy average propagation loss value is compared with the spherical wave propagation loss value, so that the gain value at the caustic convergence region is solved, and the result proves that thegain calculation method provided by the invention has a very good effect.

Description

Technical field [0001] The invention belongs to the technical field of underwater acoustic physics, and in particular relates to a method for calculating the gain of the convergence zone of the caustics of a deep sea complete sound channel based on the ray normal wave theory. Background technique [0002] The deep-sea convergence area is of great significance to deep-sea long-range sound propagation, and many scholars have conducted research on it. When the sound source is located near the sea surface, caustics and convergence areas with high sound intensity are formed near the sea surface. The so-called caustics refers to the envelope formed by the intersection point of adjacent sound rays, and the convergence zone refers to the high sound intensity caustics area formed near the sea surface. The sound intensity anomaly is the decibel value at which the spherical propagation loss is higher than the propagation loss in the convergence zone. [0003] In 1961, Hale observed a strong...

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Application Information

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IPC IPC(8): G06F17/10
CPCG06F17/10Y02A90/10
Inventor 朴胜春栗子洋张明辉雷亚辉宋扬王笑寒郭俊媛龚李佳张海刚
Owner HARBIN ENG UNIV
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