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

A technology of data statistical analysis and spacecraft structure, applied in the field of satellite dynamics test, can solve the problems of high time cost and long time consumption, achieve fast and efficient identification and positioning, and improve the level of dynamic test

Inactive Publication Date: 2018-09-25
BEIJING INST OF SPACECRAFT ENVIRONMENT ENG
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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

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

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[0020] The method provided by the patent of the present invention will be further described below in conjunction with the accompanying drawings. refer to figure 1 , figure 1 It is a schematic flow chart of the spacecraft structure fault location method based on vibration test data statistical analysis of the present invention; wherein, the method of the present invention includes the following steps:

[0021] 1 Vibration test data acquisition

[0022] After the spacecraft vibration test is performed in the order of the first low-level test -> high-level test -> the second low-level test, the first low-level and second low-level vibrations are extracted respectively Test the peak values ​​of the frequency response curves of the acceleration data of all measuring points. Assuming that the number of channels is n, two vectors [a1,a2,…,an] and [a1’,a2’,…,an’] can be constructed respectively with these data, Compute the correlation coefficient R of these two vectors. If R is gr...

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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...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/15Y02T90/00
Inventor 杨艳静谢一村王婉秋樊世超刘明辉冯国松刘沫杜晓舟王睿邵丽娟
Owner BEIJING INST OF SPACECRAFT ENVIRONMENT ENG
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