Method for quickly estimating underwater target shell radial vibration low-frequency sound radiation signals based on mode decomposition

An underwater target, modal decomposition technology, applied in the direction of calculation, special data processing applications, instruments, etc., can solve the problem of no modal order method, high computational complexity of underwater target acoustic radiation signal, and inability to achieve real-time performance And other issues

Active Publication Date: 2014-02-19
SOUTHEAST UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, for the analysis of underwater targets, real-time performance is an important indicator, and infinite order superposition cannot meet the requirements of real-time performance.
At the same time, the problem of

Method used

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  • Method for quickly estimating underwater target shell radial vibration low-frequency sound radiation signals based on mode decomposition
  • Method for quickly estimating underwater target shell radial vibration low-frequency sound radiation signals based on mode decomposition
  • Method for quickly estimating underwater target shell radial vibration low-frequency sound radiation signals based on mode decomposition

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Embodiment

[0026] A method for quickly estimating the radial vibration low-frequency acoustic radiation signal of an underwater target shell based on modal decomposition in this embodiment, as shown in figure 1 shown, including the following steps:

[0027] Step 1: According to the model structure of the research object, determine the frequency range of the research object; the relationship between the frequency range and the model structure of the research object is shown in the following table:

[0028]

[0029] That is, when the model of the research object involves a small number of ribs, ribbed plates, and decks, the frequency band is selected as a high frequency band, and the frequency range at this time is the wavelength Corresponding frequency to 20KHz; when the model of the research object involves the importance of the resonance of the cylindrical shell on the rigid cylindrical baffle, the frequency band is selected as the middle frequency band, and the frequency range is t...

Embodiment example

[0054] This example considers a single-layer cylindrical shell with no substructure, such as figure 2 Shown; the central axis of the cylindrical shell in the figure is axis, is the geometric center of the cylindrical shell, and the length is , with a radius of , with a thickness of , is the displacement along the central axis (axial direction) of the cylindrical shell; is the displacement along the radial direction (radial direction); angle is The angle between the direction and the vertical direction, accompanied by the radial change, angle The range of variation is (- π , π ); is when the included angle is , the displacement along the tangential direction (circumferential direction) of the cylindrical shell, for the observation point and distance between axes.

[0055] Shell length ,radius ,thickness , shell material density , medium density , and the coordinates of the observation point are . It can be seen from the analysis that th...

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Abstract

The invention discloses a method for quickly estimating underwater target shell radial vibration low-frequency sound radiation signals based on mode decomposition, and belongs to the technical field of underwater target sound radiation. The method includes the following steps that firstly, based on uncertainty of a researched object, the range of researched frequency bands is determined; secondly, based on a mode decomposition theory and different model structures, a simulation sound pressure equation is determined; thirdly, based on a mode truncation theory, an appropriate lower order axial mode order is calculated by adopting a higher circumferential mode order; fourthly, an appropriate lower order circumferential mode order is calculated by adopting a higher axial mode order; eventually the radiation signals through simulating calculation are acquired through calculation, and then the underwater target sound radiation condition is analyzed. According to the technical scheme, the underwater target sound radiation signals generated by radial vibration are accurately simulated through the few mode orders, and therefore calculation complexity is low and accuracy is high.

Description

technical field [0001] The invention relates to a method for simulating the radial vibration acoustic radiation signal of an underwater target shell based on mode decomposition, and belongs to the technical field of underwater target acoustic radiation. Background technique [0002] The research on acoustic radiation signal based on modal decomposition theory is widely used in underwater target analysis. The theory holds that the radiation signal can be truly simulated only when the infinite order superposition is selected for both the axial and circumferential modes. However, for the analysis of underwater targets, real-time performance is an important indicator, and infinite order superposition cannot meet the requirements of real-time performance. At the same time, the problem of selecting the modal order has not been solved, and there is no flexible method for the modal order, which leads to high computational complexity and low accuracy of the underwater target acousti...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 方世良安良程强
Owner SOUTHEAST UNIV
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