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Fault Diagnosis Method for Space Fluid Loop Systems Based on Improved Evidence Theory.

Yue Liu1,2, Zhenxiang Li1,2, Lu Zhang1,2

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|May 24, 2024
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This study introduces an improved Dempster-Shafer (D-S) evidence theory for fault diagnosis in space fluid loops. The method effectively fuses sensor data to accurately identify system faults.

Keywords:
D-S evidence theoryGaussian distributionfault diagnosisfluid loop system for space applicationsinformation fusion

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Area of Science:

  • Spacecraft engineering
  • Fault detection and diagnosis
  • Evidence theory

Background:

  • Space application fluid loop systems present complex structural challenges and utilize diverse sensor types.
  • Accurate fault diagnosis is critical for the reliability and safety of these systems.
  • Existing fault diagnosis methods struggle with data fusion from multiple, potentially conflicting, sensor sources.

Purpose of the Study:

  • To develop an improved fault diagnosis method for space application fluid loop systems.
  • To enhance data fusion capabilities from a multitude of sensors.
  • To address the challenges of complexity and conflicting evidence in fault detection.

Main Methods:

  • Utilized an improved Dempster-Shafer (D-S) evidence theory framework.
  • Employed Gaussian affiliation functions for sensor data to BPA conversion.
  • Applied pignistic probability transformation for focal element simplification.
  • Integrated Bray-Curtis dissimilarity and belief entropy for conflicting evidence fusion.

Main Results:

  • The proposed method demonstrated reliability on the Iris dataset.
  • Successfully fused information from multiple sensors in space fluid loop pump fault diagnosis.
  • Achieved accurate identification of faults in space application fluid circuit loop pumps.

Conclusions:

  • The improved D-S evidence theory offers a robust solution for fault diagnosis in complex space systems.
  • The method effectively handles data fusion and resolves conflicting evidence from diverse sensors.
  • This approach enhances the reliability and safety of space application fluid loop systems.