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Sound field acquisition method with multi-column arithmetic frequency elementary waves interacting to form parametric arrays

An acquisition method and parametric array technology, which are applied in the field of sound field acquisition in which the difference frequency original waves interact to form a parametric array, can solve problems that have not been seen in the literature, and achieve the goal of enriching sound field information, improving conversion efficiency, and improving calculation accuracy. Effect

Active Publication Date: 2014-12-17
HARBIN ENG UNIV
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Problems solved by technology

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  • Sound field acquisition method with multi-column arithmetic frequency elementary waves interacting to form parametric arrays
  • Sound field acquisition method with multi-column arithmetic frequency elementary waves interacting to form parametric arrays
  • Sound field acquisition method with multi-column arithmetic frequency elementary waves interacting to form parametric arrays

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Embodiment

[0029] (a) Taking the parametric array radiation system formed by a circular piston sound source as an example, based on the axisymmetric characteristics of the piston sound source, the three-dimensional calculation area is converted to the two-dimensional roz plane, and the finite calculation area model of the parametric array sound field is established and discretized grid division. Set 0max The interval is divided into M segments, the axial coordinate subscript m changes from 1 to M, and m=1 is called the first layer, and the radial coordinate subscript j of each layer along the radial direction, that is, the r direction, changes from 1 to J, that is Each layer should calculate J sound pressure values.

[0030] (b) Read the physical parameters such as sound velocity, density, and nonlinear coefficient of the propagation medium on which the parametric array depends, and read the excitation signal p(r j ,z 1 ,k) and harmonic component g(r j ,z 1 ,k), h(r j ,z 1 ,k):

...

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Abstract

The invention belongs to parametric array project application and particularly relates to a sound field acquisition method with multi-column arithmetic frequency elementary waves interacting to form parametric arrays. The method includes: reading sound waveforms combined by multi-column high-frequency elementary waves; radiating specific sound wave signal waveforms by a broadband high-frequency transducer, and finally generating series difference frequency wave beams with low frequency and high directivity through the nonlinear demodulation effect of transmission media; setting the calculating area of a parametric array sound field, and performing gridding dispersing; using a finite difference method to obtain the parametric array sound field under the interaction of multi-column sound waves. By the method, calculation precision is increased, the sound field distribution characteristics of a parametric array radiation system are calculated accurately, parametric array sound field distribution is displayed visually, and sound field performance is reflected accurately and comprehensively.

Description

technical field [0001] The invention belongs to the engineering application field applicable to parametric arrays, and in particular relates to a sound field acquisition method for forming a parametric array through the interaction of multi-array equal-frequency primary waves. Background technique [0002] In 2002, the East China Sea Research Station of the Chinese Academy of Sciences successfully developed a set of "dike hidden danger monitoring sonar". detection and evaluation. The original wave frequency is 100kHz, and the difference frequency is 3kHz, 6kHz, 8kHz, 10kHz, 12kHz, 15kHz, 24kHz, etc. Seven gears, and gears can be switched according to work needs. In the literature "Nonlinear multi-frequency transmitter for sea-floor characterization", Lucilla Di Marcoberardino believes that frequency diversity can provide richer information on the distribution of seabed strata, and proposes a sound source model that can simultaneously generate multiple harmonic frequencies. ...

Claims

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Application Information

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IPC IPC(8): G01S15/88G01S7/52
CPCG01S7/524G01S7/534G01S15/885H04B13/02
Inventor 杨德森李中政方尔正时胜国
Owner HARBIN ENG UNIV
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