Ultrasonic detection method for leakage rate of fuel control valve of aero-engine

By combining ultrasonic sensor arrays and deep belief networks, the problem of leakage detection of aircraft engine fuel control valves in high temperature and vibration environments was solved, and the precise positioning and visualization of omnidirectional leakage signals were achieved, thereby improving the accuracy and efficiency of detection.

CN120651437AActive Publication Date: 2025-09-16SHANGHAI HANGSHU INTELLIGENT TECH CO LTD
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Patent Information

Application Number
CN202511158064.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-19
Publication Date
2025-09-16
Estimated Expiration
2045-08-19

AI Technical Summary

Technical Problem

Existing technologies make it difficult to achieve omnidirectional leakage sensing of aircraft engine fuel control valves under high temperature and vibration environments, and are unable to effectively separate, grade, locate, and compensate for leakage signals under operating conditions, resulting in insufficient detection accuracy and reliability.

Method used

An ultrasonic sensor array is used to acquire leakage signals, and background noise is separated through wavelet packet transform. A mapping relationship between leakage characteristics and leakage amount is established based on a deep belief network. Positioning is performed by combining the cross-correlation algorithm and the compressed sensing algorithm. Bias compensation is performed through real-time monitoring of fuel temperature and engine speed to achieve accurate detection of leakage amount.

Benefits of technology

It achieves precise capture and positioning of micro-leakage signals in complex environments, improves the accuracy and reliability of detection, shortens the analysis and decision-making time of maintenance personnel, and significantly improves fault diagnosis efficiency.

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Abstract

The invention relates to the technical field of ultrasonic detection, and provides an aero-engine fuel control valve leakage amount ultrasonic detection method, which forms a coherent technical link through leakage ultrasonic signal acquisition, leakage signal separation, leakage feature extraction, leakage area positioning, offset compensation and cross validation of a sensor, and the links are mutually verified and optimized. A leakage signal is separated through a dynamic threshold value, the identification degree of a deep belief network is enhanced through multi-dimensional features, environment interference is compensated and corrected through working condition parameters, positioning deviation caused by single-link error accumulation in a traditional method is effectively restrained, accurate capturing and positioning of a micro leakage signal are achieved, and the method is suitable for large-scale popularization and application. The leakage thermodynamic diagram integrates leakage rate grading, coarse positioning area and micro leakage point information, the analysis and decision-making time of maintenance personnel is greatly shortened through a visual presentation mode, and rapid interpretation of fault positions and severity is achieved.
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