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Fault diagnosis method and device for electro-hydraulic servo valve, storage medium and electronic equipment

An electro-hydraulic servo valve and fault diagnosis technology, applied in the field of computer-readable storage medium, electronic equipment, electro-hydraulic servo valve fault diagnosis, can solve the complex and changeable failure modes, complex electro-hydraulic servo valve components, relying on expert experience, etc. problem, to avoid model training and parameter selection

Active Publication Date: 2019-11-22
ZHENJIANG SILIAN MECHATRONIC TECH
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Problems solved by technology

The components of the electro-hydraulic servo valve are complex, high-precision, and often work in high-temperature and high-pressure environments, and are one of the hydraulic components with the highest failure frequency
The electro-hydra

Method used

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  • Fault diagnosis method and device for electro-hydraulic servo valve, storage medium and electronic equipment
  • Fault diagnosis method and device for electro-hydraulic servo valve, storage medium and electronic equipment
  • Fault diagnosis method and device for electro-hydraulic servo valve, storage medium and electronic equipment

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Experimental program
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Embodiment

[0074] Step 1, such as figure 1 As shown in Fig. 1, the measurement and control system of the hydraulic test bench is used to collect data of several electro-hydraulic servo valves, and the data includes the characteristic curve formed by the no-load flow data of each electro-hydraulic servo valve under the corresponding current.

[0075] Step 2. According to the characteristic that the output flow of the electro-hydraulic servo valve and the input control current form a loop, with the flow value equal to zero as the boundary, the obtained characteristic curve of each electro-hydraulic servo valve is divided into the upper part of the characteristic curve and the lower part of the characteristic curve. Half characteristic curves, such as figure 2 shown.

[0076] Step 3. Calculate the flow difference between the upper half characteristic curve and the lower half characteristic curve of each electro-hydraulic servo valve corresponding to the same current value. The specific ca...

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Abstract

The invention provides a fault diagnosis method and device for an electro-hydraulic servo valve, a computer readable storage medium and electronic equipment. The method comprises the following steps:acquiring data of a plurality of electro-hydraulic servo valves; dividing an obtained characteristic curve into an upper half part characteristic curve and a lower half part characteristic curve by taking a flow value as an boundary; calculating a flow difference value of the upper half part characteristic curve and the lower half part characteristic curve, which correspond to the same current value; adopting a Kolmogorov-Smirnov method to verify whether each flow difference value meets Gaussian distribution or not; if each flow difference value meets Gaussian distribution, calculating a meanvalue and standard deviation of the flow difference value of the upper half part characteristic curve and the lower half part characteristic curve of each electro-hydraulic servo valve; separately performing statistiacal verification on each electro-hydraulic servo valve by F-test based on statistics, and judging whether each electro-hydraulic servo valve has faults or not. The method and the device realize efficient and accurate diagnosis for faults of the electro-hydraulic servo valves, and provide large data basis for electro-hydraulic servo valve fault identification.

Description

technical field [0001] The invention relates to the field of electro-hydraulic servo valves, in particular to a fault diagnosis method and device for an electro-hydraulic servo valve, a computer-readable storage medium and an electronic device. Background technique [0002] Electro-hydraulic servo valve is an important basic component in hydraulic servo system, widely used in aerospace, steel, metallurgy, chemical industry and other industries. The components of the electro-hydraulic servo valve are complex, high-precision, and often work in high-temperature and high-pressure environments, and are one of the hydraulic components with the highest failure frequency. The electro-hydraulic servo valve integrates mechanics, electricity and hydraulics. Its high-precision and high-integration features make its failure modes complex and changeable, with long diagnostic cycles and extremely dependent on expert experience. Therefore, it is necessary to invent an efficient and intelli...

Claims

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Application Information

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IPC IPC(8): F15B19/00
CPCF15B19/005
Inventor 潘天红郑刚付永忠叶兴海
Owner ZHENJIANG SILIAN MECHATRONIC TECH
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