A method for predicting that life of momentum wheel

Abstract

A method for predict that life of momentum wheel includes such step as:1, taking power consumption of momentum wheel as characteristic performance parameter of momentum wheel, establish a performancedegradation model of a momentum wheel by one-dimensional Wiener process; 2, obtaining that drift coefficient and the diffusion coefficient in the performance degradation model of the momentum wheel byadopting a maximum likelihood estimation method; Step S3, setting the performance failure threshold of the momentum wheel, and obtaining the expectation and variance of the life of the momentum wheelaccording to the failure threshold. The invention solves the problem that, due to the restriction of the cost and the progress, the life test of the large sample and the long time can not be carriedout on the ground, and the statistical conclusion that it is difficult to obtain the failure data required for the life prediction can not accurately evaluate the life of the momentum wheel with longlife.

Description

technical field [0001] The invention relates to the technical field of equipment failure prediction and health management, in particular to a method for predicting the life of a momentum wheel. Background technique [0002] Most of the traditional remaining life prediction methods are based on the historical life data of a single physical quantity of long-lived momentum wheel samples, and determine the remaining life distribution track of long-lived momentum wheel samples through the analysis of its univariate degradation data. However, a large number of long-life momentum wheel samples with long service life and high reliability have emerged in various new industries, such as machinery industry, chemical industry, electronics industry, aerospace industry and many other fields. Both the traditional life test and the accelerated life test are difficult to obtain the failure data of the long-lived momentum wheel sample in a short period of time, which leads to the inability to...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a momentum wheel life prediction method. By establishing a momentum wheel failure model based on performance degradation, it can be evaluated based on the life test data of a small sample within a limited time and the data information that is easily collected on the ground and on the track. The long-life momentum wheel life is used to solve the problem that due to the limitation of funds and progress in the existing technology, the ground cannot carry out large-scale long-term life tests on the ground, and it is difficult to obtain the statistical conclusions of failure data required for life prediction. The problem of accurate assessment of wheel life

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