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Parabolic-equation-theory-based gain calculation method for caustic line convergence region under deep sea complete sound track

A parabolic equation and caustics technology, applied in the processing of the detected response signal, the use of sonic/ultrasonic/infrasonic waves to analyze fluids, and the use of sonic/ultrasonic/infrasonic waves for material analysis, etc.

Active Publication Date: 2020-04-14
HARBIN ENG UNIV
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AI Technical Summary

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 convergence zone of caustics under the complete sound channel in the deep sea based on the parabolic equation theory

Method used

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  • Parabolic-equation-theory-based gain calculation method for caustic line convergence region under deep sea complete sound track
  • Parabolic-equation-theory-based gain calculation method for caustic line convergence region under deep sea complete sound track
  • Parabolic-equation-theory-based gain calculation method for caustic line convergence region under deep sea complete sound track

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Embodiment

[0065] Analyzing the Munk profile, a typical deep-sea sound velocity profile, the sound velocity expression of the Munk profile is:

[0066] c(z)=c 0 {1+ε[e -η -(1-η))) (1)

[0067] 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 velocity, 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.

[0068] The sound source depth is 300m, and an environment with a sea depth of 6000m is selected for simulation. The signal is filtered at one-third octave of the center frequency of 200Hz, using RAM parabolic equation sound field calculation software, the frequency range is 178-224Hz, and the step is 1Hz Long, calculate the sound field separately at each frequency point, then use formula (5) to calculate the frequency average sound intensity, and then calculate the freque...

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Abstract

The invention provides a parabolic-equation-theory-based gain calculation method for a caustic line convergence region under a deep sea complete sound track. According to the invention, under the deepsea complete sound track condition, a parabolic equation theory is utilized to analyze a typical deep sea Munk sound velocity profile situation to obtain an expression of the sound pressure; the sound intensity is calculated according to the expression of the sound pressure; an average sound intensity value of the energy is calculated in the bandwidth of the 1 / 3 octave of the central frequency and an average propagation loss value of the energy is calculated according to the average sound intensity value; and then a spherical wave propagation loss value at a caustic line of a convergence region is calculated and the average energy propagation loss value is compared with the spherical wave propagation loss value, so that a gain value at the caustic line of the convergence region is calculated. The result proves that the gain 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 a caustics convergence zone under a deep sea complete sound channel based on the parabolic equation 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 co...

Claims

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Application Information

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IPC IPC(8): G01N29/44G01N29/48G01N29/02
CPCG01N29/449G01N29/48G01N29/02
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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