Multi-mode fault diagnosis method and device for momentum exchange device based on trajectory sensitivity method

By constructing a dynamic model using the trajectory sensitivity method and performing multi-channel residual signal fusion analysis, the problem of early fault identification of spacecraft momentum exchange devices was solved. This enabled high-sensitivity and high-accuracy fault detection of weak anomalies, adapting to different operating conditions and meeting the requirements of real-time on-orbit monitoring of spacecraft.

CN122333355APending Publication Date: 2026-07-03CHONGQING UNIV
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Patent Information

Application Number
CN202610462284.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-09
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing technologies are insufficient to effectively identify early, minor faults in spacecraft momentum exchange devices, especially problems such as nonlinear friction, bearing aging, and sensor drift. This results in inadequate real-time performance and accuracy of fault identification, making it difficult to meet the high requirements for on-orbit fault diagnosis of spacecraft.

Method used

A dynamic model is constructed using the trajectory sensitivity method. By applying perturbations to key parameters, the trajectory sensitivity is calculated, multi-channel residual signals are generated, and a parallel computing architecture is used for fusion analysis. Fault detection is achieved by combining adaptive threshold adjustment.

Benefits of technology

It improves the sensitivity and diagnostic accuracy of early faults in spacecraft momentum exchange devices, enabling timely detection of subtle anomalies, reducing the rate of missed detections and false judgments, adapting to different operating conditions, and meeting the real-time on-orbit monitoring needs of spacecraft.

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Abstract

The invention relates to the technical field of aerospace, in particular to a multi-mode fault diagnosis method and device for a momentum exchange device based on a trajectory sensitivity method. The method comprises the following steps: connecting multiple types of sensors on a momentum exchange device, and acquiring multi-modal monitoring data in real time; a trajectory sensitivity analysis algorithm is operated, residual errors of all channels are calculated, and normalized multi-channel residual error signals are generated; and carrying out fusion analysis on the multi-channel residual error based on a parallel computing architecture, outputting an abnormal score, comparing the abnormal score with a threshold value, and judging a fault type and a fault part. According to the method, the influence derivative of parameter change on the system output track is calculated in real time by adopting a sensitivity analysis algorithm, and the generation and normalization of residual signals are guided, so that tiny deviation caused by slight friction increase, bearing wear and the like is amplified and highlighted, thereby realizing timely detection at the initial stage of a fault and improving the fault detection accuracy. The defect that a traditional method is insufficient in sensitivity to initial weak anomaly is overcome.
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