Near-field acoustic tomography test method for mutual radiation impedance of underwater acoustic array

Abstract

The invention belongs to the field of underwater acoustic test technology base, and mainly relates to a near-field acoustic tomography measurement method for the mutual radiation impedance of an underwater acoustic array. The method includes the following steps: obtaining near-field acoustic field information of a radiated acoustic field of an acoustic array through laser tomography measurement; processing the obtained acoustic field information by using a near-field acoustic holographic transformation technology; dividing the complex vibration velocity into blocks according to the position ofeach array element to obtain the complex vibration velocity of the source surface of each array element; calculating the complex acoustic pressure of the source surface of each array element and theradiated acoustic pressure generated by the array element in the surface positions of the other array elements; and carrying out calculation based on the classic acoustic array mutual radiation impedance theory. The beneficial effects are as follows: the shortcomings of the common intrusive acoustic array mutual radiation test method are overcome by a non-contact test method; the problem that there is no method for accurately testing the mutual radiation impedance of an underwater acoustic array at low frequency and high power is solved; a mutual radiation model is provided for the velocity control of an underwater acoustic array; and a powerful technical guarantee is provided for the design and development of a low-frequency and high-power acoustic array.

Description

technical field [0001] The invention relates to the field of basic research of underwater acoustic technology, belongs to the underwater acoustic array radiation impedance testing technology, and mainly relates to a near-field acoustic tomography test method for the underwater acoustic array mutual radiation impedance. Background technique [0002] With the development of underwater acoustic technology, the application frequency of underwater acoustics gradually expands to low frequencies. In order to increase the long-range detection and early warning capabilities of underwater targets, it is especially necessary to solve the problem of effective detection of low-noise targets. Active sonar arrays are gradually developing in the direction of low frequency, large aperture, and high power. In order to achieve high enough transmission power in a limited space, the array elements are usually arranged in a dense array in the design of active sonar arrays. When the distance betw...

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Problems solved by technology

[0004] The purpose of the present invention overcomes the deficiencies of the existing interventional underwater acoustic-based array radiation impedance testing method, especially solves the method and accurate measurement problem required for the array element mutual radiation impedance test under the high-power operation of the low-frequency active sonar array, and provides A near-field acoustic tomography test method for the mutual radiation impedance of underwater acoustic arrays, mainly using a non-contact underwater acoustic array mutual radiation impedance test method

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