Typical fault diagnosis method for electro-hydraulic servo mechanism of air inlet wheel disc type regulating valve of high-altitude platform

• Main Authors: PEI XITONG, WANG XIN, CHEN HUA, LIU WEI, DAN ZHIHONG, ZHANG SONG, ZHAO WEI, WANG BIN, QIAN QIUMENG, CHANG RUI
• Format: Patent
• Language: Chinese; English
• Published: 06.01.2023
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; MEASURING; PHYSICS; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR

The invention provides a typical fault diagnosis method for an electro-hydraulic servo mechanism of an air inlet wheel disc type regulating valve of a high-altitude platform, which comprises the following steps of: 1, outputting a command signal of valve opening by an air inlet system controller according to a pressure requirement, taking the command signal as the input of an electro-hydraulic servo actuating mechanism, and controlling the electro-hydraulic servo actuating mechanism to operate; the hydraulic cylinder outputs displacement corresponding to the opening degree requirement of the valve, and the displacement is fed back to the controller through the displacement sensor; step 2, performing fault injection on the displacement sensor and giving a corresponding fault label, performing feature extraction on a fault signal of the displacement sensor, obtaining a prediction model in which a corresponding relationship is formed between a modulus maximum change trend and the corresponding fault label, and p