Noise reduction effect detection method of ship bow acoustic platform sound-absorption/insulation material

Abstract

The invention relates to the field of the underwater structure noise control engineering, and specifically relates to a noise reduction effect detection method of a ship bow acoustic platform sound-absorption / insulation material. The method comprises the following steps: establishing a test system in a ship bow acoustic platform, measuring self-noise by directly utilizing a self-array hydrophone installed at an array location through the adoption of a platform self-noise horizontal detection processing method, describing the distribution of the whole sound field in the acoustic platform through thought of average sound energy, computing mean-square sound pressure level at each measurement point in the ship bow acoustic platform by adopting the mean-square sound pressure method, and obtaining the mean-square sound pressure level of the whole sound field in the ship bow acoustic platform by using a formula so as to be used as a data result of the self-noise level in the ship bow acousticplatform. Noise reduction control effects on the ship bow acoustic platform self-noise by different sound-absorption / insulation materials can be directly evaluated, thereby realizing the detection onthe noise reduction effects on the ship bow acoustic platform self-noise by different sound-absorption / insulation materials

Description

technical field [0001] The invention relates to the field of underwater structural noise control engineering, in particular to a method for detecting the noise reduction effect of a bow acoustic platform sound-absorbing and insulating material structure. Background technique [0002] The performance of the sonar system in the ship's bow acoustic platform plays an important role in the combat capability of the surface ship. The acoustic interference encountered by the sonar when it is working is the self-noise in the acoustic platform, which is expressed as the noise level NL item in the sonar equation, and its size directly affects the detection range of the ship's own sonar. Therefore, it is particularly important to take effective control measures to reduce the self-noise in the bow acoustic platform, ensure the normal operation of the sonar system, and test the noise control effect. [0003] Since the self-noise in the bow acoustic platform has the characteristics of mul...

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Problems solved by technology

[0004]At present, traditionally, the evaluation of the noise reduction effect of the sound-absorbing and insulating material structure of the bow acoustic platform is mainly through software simulation, and model tests are rarely used. Although this method can better predict the control effect of the sound-absorbing and insulating material structure on the self-noise of the platform area, the simulation of the actual working acoustic environment of the platform is not very ideal, and there is still a large error with the actual situation

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