Pressure-resistant acoustic filter for truncation parametric array and design method

Abstract

The invention discloses a pressure-resistant acoustic filter for a truncation parametric array and a design method. The acoustic filter comprises a front plate, a rear plate, a connecting piece and abolt. The design method comprises the following steps of S1, determining the density and the sound velocity of a front plate material and a rear plate material, S2, determining the frequency ranges and the sound reduction indexes of a high-frequency band and a low-frequency band; S3, calculating the thickness and the spacing of the front and rear plates; S4, determining the surface dimensions of the front and rear plates; and S5, designing a installation structure. Since all parts, except the position of the connecting piece, between the front and rear plates communicate with the outside, anda formed cavity structure having a certain spacing does not change under different water depths, the acoustic performance of the acoustic filter does not vary with pressure, thereby solving the problem of pressure resistance. Moreover, since the acoustic filter design method can be customized according to the use frequency requirements of different truncation parametric arrays, high-frequency initial waves can be blocked and low-frequency difference frequency waves can be transmitted. The method is simple and convenient.

Description

technical field [0001] The technical field of the invention is acoustics, and relates to a pressure-resistant acoustic filter, mainly a pressure-resistant acoustic filter for truncating a parameter array and a design method thereof. Background technique [0002] The acoustic parametric array is an acoustic emission device that uses the nonlinear characteristics of sound wave propagation in the medium to obtain sound waves such as difference frequency and sum frequency through two columns of high-frequency initial waves propagating in the same direction. Among them, the difference frequency wave is a low-frequency sound wave with sharp directivity, which makes it more and more widely used in underwater and air. In general applications, the high-frequency initial wave and the sum-frequency wave are naturally attenuated in the medium through long-distance sound propagation. In order to realize low-frequency measurement in small waters, the truncated parametric array technology ...

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Problems solved by technology

[0005] The invention solves the problem that the existing acoustic filter is not pressure-resistant, and the sound insulation effect decreases due to the change of the acoustic performance with the pressure, so that the high-frequency initial wave and the sum-frequency sound wave cannot be effectively cut off.

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