Structure failure mode diagnosing method on basis of sound spectrum of spacecraft vibration test

Abstract

The invention discloses a structure failure mode diagnosing method, which comprises the following steps: performing a low-magnitude vibration test and a high-magnitude vibration test on a vibration table for the first time; then performing the low-magnitude vibration test on the vibration table for the second time; respectively comparing sound spectrums of the first time low-magnitude vibration test and the second time low-magnitude vibration test, sound spectrums of the first time low-magnitude vibration test and the high-magnitude vibration, and sound spectrums of the high-magnitude test and the first time low-magnitude vibration test; according to the comparison results, preliminarily judging whether the structure of a spacecraft goes out of order, and further performing the characteristic analysis for the sound spectrum data and comparing with cases in a failure mode database; and finally, diagnosing the failure mode of the spacecraft. The structure failure model diagnosing method disclosed by the invention realizes structure failure mode diagnosis of the spacecraft during the vibration tests, and improves the technology level of the vibration tests.

Description

technical field [0001] The invention belongs to the field of spacecraft structural fault diagnosis, and in particular relates to a structural fault mode diagnosis method based on the acoustic spectrum of a spacecraft vibration test. Background technique [0002] The spacecraft must be tested by the vibration environment during the development or launch process. The vibration environment may lead to structural failures such as loosening or breaking of the spacecraft structure. Structural failures are analyzed and judged by fault diagnosis methods. Fault diagnosis is a conventional diagnostic technology based on sensing technology and dynamic testing technology, with signal processing as the technical means. From the technical means, it can use vibration, noise, force and other signals to implement diagnosis. Structural fault diagnosis belongs to acoustic diagnosis technology. [0003] Acoustic diagnosis technology developed relatively early in foreign countries. The AcousNav...

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Problems solved by technology

[0005] However, at present, there is no structural failure mode diagnosis method based on acoustic spectrum specifically for spacecraft vibration tests in China. In order

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