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Method for modeling lens sound field

A modeling method and lens technology, applied in the re-radiation of sound waves, the use of re-radiation, measurement devices, etc., can solve the problems of not fully considering the volatility of sound waves, etc., and achieve the effect of high calculation speed

Inactive Publication Date: 2008-09-03
HARBIN ENG UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, there are still some improvements in these methods, such as not fully considering the fluctuation of the sound wave, and not being well suited for modeling and simulating the sound field of the lens, etc.

Method used

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  • Method for modeling lens sound field
  • Method for modeling lens sound field
  • Method for modeling lens sound field

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Experimental program
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Embodiment Construction

[0018] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0019] 1. Initial parameter definition

[0020] Define the frequency of the sound wave as f and the initial amplitude as A0.

[0021] Assume that the sound wave passes through the acoustic lens made of medium 2 from medium 1 and then enters medium 1 ( image 3 ). Define the density and sound velocity of medium 1 as ρ 1 、c 1 , the density and sound velocity of medium 2 are ρ 2 、c 2 , the sound attenuation coefficients in medium 1 and medium 2 are respectively α 1 、α 2 . l 1 and l 2 are the physical path lengths of the acoustic waves propagating in medium 1 and medium 2, respectively.

[0022] 2. Establish a coordinate system. In order to realize the focus of the sound wave, the lens is a concave lens.

[0023] When calculating the sound field inside the lens, the center of the front interface is taken as the origin O 1 , taking the thickness direction ...

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Abstract

The invention provides a modeling method of lens sound field, comprising: initializing the parameter definition; establishing coordinate system; calculating the refraction angle of sound wave and amplitude, phase of sound pressure based on ray property of sound wave; further calculating complex sound pressure of each point on the first surface; calculating complex sound pressure of each point in the second concave of lens; calculating the refraction angle of interface and amplitude, phase of sound pressure after sound wave emitting based; calculating the complex sound pressure of each point on the second surface; calculating the sound pressure field of the back of the lens. The said method more adequately considers the wave property of sound property of sound wave on the based of considering ray property and sound property of sound wave, with higher computation speed. The invention lucubrates the establishing method of lens sound field model and presents emulational computer result.

Description

(1) Technical field [0001] The invention relates to a sound field modeling method. Specifically, it is a method for establishing a sound field model after sound waves pass through a lens. (2) Background technology [0002] High-resolution imaging sonar has a wide range of applications in underwater detection and marine resource development. Beamforming with acoustic lenses is a new approach to beamforming that can achieve higher resolution with less bulk and power consumption. [0003] In the design and development of lens sonar, a key link is to analyze the position of the focal point after the sound wave passes through the lens, as well as sonar performance indicators such as resolution, side lobe, and detection opening angle. In the stage of design and theoretical analysis, these indicators can and can only be obtained by calculating the mathematical model of the lens sound field. The use of A hybrid model composed of geometric acoustics and wave acoustics for sound f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/523G01S15/89
Inventor 卞红雨吴菊高云超桑恩方沈郑燕
Owner HARBIN ENG UNIV
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