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Acta Aeronautica et Astronautica Sinica ›› 2026, Vol. 47 ›› Issue (7): 432458.doi: 10.7527/S1000-6893.2025.32458

• Material Engineering and Mechanical Manufacturing • Previous Articles    

Health assessment for electro-hydraulic servomechanism with multi-source information fusion

Wenbo LI, Zhijie ZHOU(), Zhaoqiang WANG, Zhichao FENG, Yijie SUN, Xinyi ZHANG   

  1. College of Missile Engineering,Rocket Force University of Engineering,Xi’an 710038,China
  • Received:2025-06-20 Revised:2025-07-16 Accepted:2025-10-11 Online:2025-12-01 Published:2025-11-28
  • Contact: Zhijie ZHOU
  • Supported by:
    National Natural Science Foundation of China(62573349); Aeronautical Science Foundation of China(2023Z034053004); Young Talent Promotion Program of Shaanxi Association for Science and Technology(20230125); China Postdoctoral Science Foundation(2023M742843); Key Research and Development Program of Shaanxi(2025CY-YBXM-102); Key Projects of the Shaanxi Province Natural Science Foundation(2025JC-QYXQ-038); Open Foundation of the State Key Laboratory of Fluid Power and Mechatronic Systems(GZKF-202430)

Abstract:

Electro-Hydraulic Servomechanism (EHS) serves as critical actuators in aerospace equipment, and maintaining its health status is vital for ensuring the safe and stable operation of aerospace systems. However, existing health assessment models face two major challenges: first, the vast amount of historical text data generated during EHS operation is difficult to utilize effectively; second, there is a lack of efficient methods for integrating historical text data with test data. To address these issues, a health status assessment model is proposed based on natural language processing evidence inference rules. First, a historical text information extraction strategy is designed based on Bidirectional Encoder Representations from Transformers (BERT). Subsequently, by analyzing the operational mechanisms of EHS, a health assessment indicator system is constructed, and methods for calculating maintenance levels and operational time influence factors are proposed. On this basis, an Evidential Reasoning rule with Multi-source Information Fusion health status assessment model (ER-MIF) is developed. To mitigate the impact of expert knowledge uncertainty, a health assessment model parameter optimization model is established to determine optimal parameters and enhance assessment accuracy. Finally, the effectiveness of the proposed model was validated through an evaluation case study and comparative analysis of a specific electro-hydraulic servo mechanism.

Key words: evidential reasoning rule, health assessment, natural language processing, electro-hydraulic servomechanism, diagnostic reasoning

CLC Number: