Ship free field underwater acoustic radiation far field criterion method

A technology of underwater acoustic radiation and ships, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems that are rarely involved, and achieve good intuitive effects

Active Publication Date: 2019-04-19
CSSC POWER INST CO LTD
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Problems solved by technology

[0004] At present, scholars mainly conduct research on the far-field criterion of underwater structures based on engineering experience and test measurement methods. From the perspective of simulation, there is little research on the far-field criterion of underwater acoustic radiation of actual ships.

Method used

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  • Ship free field underwater acoustic radiation far field criterion method
  • Ship free field underwater acoustic radiation far field criterion method
  • Ship free field underwater acoustic radiation far field criterion method

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Embodiment

[0050] For general sound sources, the radiated sound pressure decreases with increasing distance in the far field. For the structure-borne sound source, it is assumed that its sound pressure is Satisfied in the far field of the sound field:

[0051]

[0052] In the formula: r is the distance from the field point to the equivalent sound source; p equ is the equivalent sound pressure amplitude.

[0053]The directivity function of far-field sound pressure is:

[0054]

[0055] It can be seen from formula (2) that the directivity function of radiation sound pressure in the far field has nothing to do with r, that is, the directivity of sound pressure does not change with the change of distance. The present invention judges the sound radiation far field based on the radiation sound pressure directivity of the ship, and when the sound radiation directivity of the ship no longer changes with the change of the distance, the position of the far field can be determined at this...

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Abstract

The invention provides a ship free field underwater acoustic radiation far field criterion method. The method comprises the steps that a ship drawing is used for establishing a whole ship and surrounding fluid finite element model; Obtaining input excitation for calculating the vibration response of the whole ship; Calculating a vibration wet mode of the ship body by using a finite element method,and calculating a vibration response of the whole ship based on a mode superposition method; Establishing a ship acoustic radiation calculation boundary element model; Mapping the vibration velocityinterpolation of the wet water surface shell of the ship body into a boundary element grid to serve as a boundary condition of ship underwater acoustic radiation calculation; Establishing ship underwater acoustic radiation directivity field points under different water depths and radiation radiuses, and calculating acoustic radiation directivity of the ship under different frequencies by utilizinga boundary element method; And analyzing the acoustic radiation directivity of the ship, and judging the underwater acoustic radiation far-field distance of the ship. The acoustic radiation directivity is used as a ship far-field criterion method, and the method has good intuitiveness and can be applied to underwater acoustic radiation far-field criteria of various ships and submarines.

Description

technical field [0001] The invention relates to the technical fields of engineering mechanics and acoustics, in particular to a far-field criterion method for ship free-field underwater acoustic radiation. Background technique [0002] During the voyage of the ship, the internal main power equipment (main engine, diesel generator set, etc.) will vibrate, which will cause the vibration of the hull, and the vibration of the hull will cause the movement of the surrounding fluid to generate underwater acoustic radiation. For military ships, the measurement of ship sound The most important indicator of stealth performance is the underwater radiation noise of ships. [0003] There are far field and near field in the underwater radiation sound field of ships, and the radiation sound pressure has large fluctuations in the near field. Obtaining a more accurate far-field distance is of great significance for improving the measurement accuracy of the ship's underwater radiated sound p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23G06F30/15Y02T90/00
Inventor 张波董晶瑾吕秉琳
Owner CSSC POWER INST CO LTD
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