Method used for stripping influence of background noise in sealed cabin noise testing process

Abstract

The invention relates to a method used for stripping influence of a background noise in a sealed cabin noise testing process, comprising the following steps: S1, selecting a test point used for testing a noise in a sealed cabin, and mounting a noise test instrument; S2, acquiring a background noise level Lp' when a load in the sealed cabin is in a shutdown state by virtue of the noise test instrument, electrifying the sealed cabin and acquiring the actually measured noise level LpSigma when the load in the sealed cabin is in an operating state, and defining a real noise level when the load inthe sealed cabin is in the operating state and after the influence of the background noise is stripped as Lp; S3, obtaining a first noise difference value according to the background noise level Lp' and the actually measured noise level LpSigma, and obtaining a second noise difference value according to the actually measured noise level LpSigma and the real noise level Lp; and S4, acquiring a correction curve of the actually measured noise level LpSigma according to the first noise different value and the second noise difference value. The method provided by the invention realizes precise stripping on the background noise and obtains a more accurate real noise test result.

Description

technical field [0001] The invention relates to a method for stripping the influence of background noise when testing the noise of a sealed cabin, in particular to a method for stripping the influence of background noise when testing the noise of a sealed cabin for a manned spacecraft. Background technique [0002] When a manned spacecraft is in orbit for a long time, it is exposed to the poor noise environment in the airtight cabin, which will have adverse effects on the work, life, physiology and psychology of the astronauts. The harsh noise environment will even affect the safety of the mission. Users generally require that the noise level index in the airtight cabin of a manned spacecraft be limited within a certain range. Before the manned spacecraft is launched into orbit, it is necessary to conduct effective test verification on the noise level in the airtight cabin during the ground development period. During the test, the background noise at the test site directly ...

AI Technical Summary

Problems solved by technology

At present, when my country's manned spacecraft conducts noise tests in sealed cabins on the ground, the requirement for background noise is generally to "keep the scene quiet", and the influence of background noise on the measured results has not been analyzed from the mechanism, which in turn affects the accuracy of the measured results.

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