Fault locating method for spacecraft structure based on statistical analysis of vibration test data

Abstract

The invention discloses a fault locating method for a spacecraft structure based on statistical analysis of vibration test data. On the basis of statistical analysis of a frequency-domain data full sample of test data, a set of data most possibly containing a fault area is screened out, targeted time-frequency analysis is conducted on the data, characteristic data of the vibration test data is extracted, whether or not the spacecraft structure breaks down is judged, and fault locating is achieved. By means of the fault locating method for the spacecraft structure based on the statistical analysis of the vibration test data, a structural fault can be quickly and efficiently identified and located during a ground test of a spacecraft, and the dynamic test level of the spacecraft is increased.

Description

technical field [0001] The invention belongs to the technical field of satellite dynamics test, and in particular relates to a method for diagnosing a spacecraft structure fault based on the statistical analysis of vibration test data, and accurately obtaining the location of the spacecraft structure fault according to the fault diagnosis. Background technique [0002] As a carrier rocket, the payload of a satellite is subject to the vibration environment during launch, flight, and reentry, and it will also be subjected to the vibration environment of road or rail transportation during ground transportation. These vibration environments are dynamically transmitted through the structure of the satellite, and act on the structure of the system level, subsystem level and component level of the satellite or on-board instruments and equipment step by step, and may cause structural damage, performance degradation, failure or failure of instruments and equipment. In order to verify...

AI Technical Summary

Problems solved by technology

But there are also deficiencies. For example, how to determine the location of the fault point, the form of the fault, and whether the structure needs to be improved is mainly based on the experience of designers and workers.

This kind of method can realize the location of the fault because more signal features are preserved, but due to the large number of measurement points (usually hundreds of channels) in the vibration test of the spacecraft, it usually takes too long to adopt this kind of method

Taking the empirical mode decomposition method as an example, using a computer with a CPU of 2.5GHz and a memory of 8G, the analysis time of conventional single-channel test data usually takes more than 5 minutes. If all channels are to be analyzed, the time-consuming cost is very high

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