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Underwater sedimentary layer multilayer medium acoustic reflection time domain response analytical solution calculation method based on wave group analysis

A technology of multi-layer medium and calculation method, which can be applied in complex mathematical operations, use of wave/particle radiation, design optimization/simulation, etc. Effect

Pending Publication Date: 2022-05-06
THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the sound wave moves back and forth in multiple medium interfaces, new reflected waves and transmitted waves will be generated every time it encounters a medium interface, and the newly generated sound waves will generate more sound waves after secondary reflection and transmission. The reflected wave composition of the multi-layer medium is extremely complex

Method used

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  • Underwater sedimentary layer multilayer medium acoustic reflection time domain response analytical solution calculation method based on wave group analysis
  • Underwater sedimentary layer multilayer medium acoustic reflection time domain response analytical solution calculation method based on wave group analysis
  • Underwater sedimentary layer multilayer medium acoustic reflection time domain response analytical solution calculation method based on wave group analysis

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Embodiment 1

[0052] see also Figure 2 ， Figure 2 Schematic diagram of acoustic model of three-layer medium section calculated for wave group of time-domain response of three-layer medium, and the situation of sound source a in 1# medium layer.

[0053] In the three-layer medium profile acoustic model of this embodiment, the number of each layer is 0#, 1#, 2#, respectively from top to bottom, and the medium number of each layer and the corresponding characteristic impedance Z and sound velocity C are Z in turn 0 、z 1 、z 2 And C o 、c 1 、c 2 , the thickness of 0# dielectric layer and 2# dielectric layer is positive infinity, and the thickness of 1# dielectric layer is d 1 。 Set a sound source a to send sound waves upward After touching the 0#, 1# medium interface, a reflected wave downward from the 0# medium reflection direction will be generated And the 1# transmission wave upward from the transmission direction of the medium At this time, the reflected signal R of the 1# dielectric layer 1...

Embodiment 2

[0078] see also Figure 4 ， Figure 4 Schematic diagram of acoustic model of multi-layer medium section calculated for wave group of time-domain response of multi-layer medium in embodiment 2 (sound source a is in n-1# medium layer); After understanding the construction method of three-layer medium profile acoustic model in embodiment 1, the construction of more than three-layer medium profile acoustic model will be further introduced. Firstly, assume that an underwater stratigraphic profile structure model has n + 2 layers of media, and the number of media in each layer and the corresponding characteristic impedance Z and sound velocity C are Z in turn 0 …z n-2 、z n-1 、Z n 、z n+1 And C 0 …c n-2 、c n-1 、c n 、c n+1 , the thickness of 0# dielectric layer and N + 1# dielectric layer is positive infinity. An existing sound source a emits plane waves upward and only upward in the n-1# dielectric layer When the sound wave contacts the interface between n-1# and n-2# dielectric layer, it ...

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Abstract

The invention provides an underwater sedimentary layer multilayer medium acoustic reflection time domain response analytical solution calculation method based on wave group analysis, and relates to the technical field of underwater sound, and the method comprises the steps: numbering multiple layers of media in sequence, determining the impedance, sound velocity and thickness of each layer of media, putting a sound source into a certain layer of media, and calculating the acoustic reflection time domain response analytical solution of the multiple layers of media. The method comprises the following steps: decomposing a sound source into a transmission wave group and a reflection wave group after multiple times of reflection and transmission in a medium, numbering the wave groups, obtaining a reflection wave group expression of the sound source in the layer of medium, obtaining a multilayer medium profile acoustic model, and calculating a wave group time domain response of each layer of medium; and finally obtaining an analytic solution of the acoustic reflection time domain response of the multilayer medium. According to the method, the problem that the multi-layer medium reflection time domain response lacks an analytical solution is solved, the acoustic wave time domain response of more than ten layers of three times of reflection can be obtained only by occupying extremely few computing resources, and the method is more accordant with the actual situation of reflection of acoustic waves in the multi-layer medium.

Description

technical field [0001] The invention relates to the field of underwater acoustic technology, in particular to an analytical solution calculation method of acoustic reflection time domain response of multi-layer media of underwater sedimentary layer based on wave group analysis. Background technology [0002] At present, due to the gradual deepening of China's development of marine resources, the research in the fields of seabed mapping, underwater communication, marine environment monitoring and the establishment of underwater early warning system has received the attention of the state, which is of great significance to China's economic construction and the improvement of national defense strength. As the most suitable carrier for underwater information transmission, the propagation mechanism of acoustic wave in underwater environment is a very important research content in the related research of marine resources development. [0003] At present, the research on the medium and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G01B15/02G06F17/10
CPCG06F30/20G01B15/02G06F17/10Y02T90/00
Inventor 佟昊阳赵涵陈毅
Owner THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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