Comprehensive judging method for fault of space movable part shafting

Abstract

A comprehensive judging method for faults of a space movable part shafting is provided. Through employment of three modes including current, friction torque and micro vibration, the state of a space movable part shafting is comprehensively evaluated, and a shafting fault locating is achieved without dismounting of the shafting. In particular, through analysis of the fault characteristic frequency of bearing components and the inherent frequency shift of the shafting, a person can know change reasons of the frequency spectrum so as to diagnose and locate faults of the space movable part shafting. On one hand, the person can identify a faulty shafting in time and take effective remedy measures, thereby preventing the shafting from being scrapped unnecessarily. On the other hand, the person accurately locates the faults, and provides more scientific, accurate and effective improvement measures to improve the reliability of the shafting.

Description

technical field [0001] The invention relates to a comprehensive evaluation method for shaft system faults of space movable parts, and belongs to the technical field of fault diagnosis. Background technique [0002] Space moving parts represented by flywheels and control moment gyroscopes are widely used in various spacecraft to stabilize or adjust the attitude of the spacecraft. As one of the core components of space moving parts, the shaft system provides a stable slewing bearing, which has the characteristics of high rotation accuracy, high precision level, high stability and long life. Once the shaft system fails, it will seriously affect the main functions of space moving parts, and even cause the spacecraft to be scrapped. In addition, since the space active components need to undergo a series of mechanical tests and space environment test assessments before delivery to the final assembly, once the shafting fails, not only the tests need to be redone, but also the deli...

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Problems solved by technology

[0005] (2) The response of the current to certain faults in the shaft system is slow and the sensitivity is low. Especially for local damage such as peeling, indentation or cracks on the working surface, it is difficult to monitor in the early stage. Only when the fault accumulates to a certain extent can the current pass reflect

If the shaft system with such early failures is installed into the space active components, or even delivered to the final assembly for final launch, if a failure occurs after orbital operation, it will seriously affect the main functions of the space active components, and even cause the spacecraft to be scrapped. The consequences are immeasurable

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