Method and device for multi-modal fault diagnosis of momentum exchange device based on trajectory sensitivity

Abstract

This invention relates to the field of aerospace technology, and particularly to a method and apparatus for multimodal fault diagnosis of momentum exchange devices based on trajectory sensitivity analysis. The method includes: connecting multiple types of sensors on the momentum exchange device to acquire multimodal monitoring data in real time; running a trajectory sensitivity analysis algorithm to calculate the residuals of each channel and generate normalized multi-channel residual signals; performing fusion analysis on the multi-channel residuals based on a parallel computing architecture, outputting anomaly scores and comparing them with thresholds to determine the fault type and location. This invention uses a sensitivity analysis algorithm to calculate the derivative of the influence of parameter changes on the system's output trajectory in real time, and guides the generation and normalization of residual signals. This amplifies and highlights minute deviations caused by slight increases in friction, bearing wear, etc., thereby achieving timely detection of faults in their early stages and overcoming the shortcomings of traditional methods in terms of insufficient sensitivity to initial weak anomalies.

Images