Fault diagnosis and test method based on proportional valve shaft controller

Abstract

The invention discloses a fault diagnosis and test method based on a proportional valve shaft controller. The method comprises the following steps: collecting test data of different types of proportional valves in different states; extracting slow features of the test data of the proportional valve; generating a plurality of training sample subsets according to the newly calibrated slow features of the test data of the proportional valve; training different random forest models for different types of proportional valves; fault diagnosis of a proportional valve shaft controller: after the model of the proportional valve is determined, inputting the slow data characteristics of the proportional valve to be detected into the random forest model of the corresponding model, and outputting a fault type label of the proportional valve; and optimizing the random forest model on line. The fault of the proportional valve shaft controller is judged after the proportional valve flow characteristic experiment, the proportional valve threshold characteristic experiment and the proportional valve pressure gain experiment are combined and subjected to characteristic fusion, and the fault recognition rate is higher than the fault recognition precision of the proportional valve shaft controller of a single experiment.

Description

technical field [0001] The invention relates to the field of proportional valve fault diagnosis, in particular to a fault diagnosis and testing method based on a proportional valve shaft controller. Background technique [0002] Proportional valves are widely used in the fields of metallurgy, aerospace, ships, weapons and petrochemicals. Fault identification of proportional valve shaft controllers is an important direction in the field of proportional valves. Once a proportional valve shaft controller fails, it will generate immeasurable damage. Therefore, improving the proportional valve axis controller is a research hotspot in the field of proportional valves. The essence of the detection problem of proportional valve shaft controller is the fault mode recognition problem of proportional valve shaft controller, in which the feature extraction of data and the design of classification model are the key points of pattern recognition. [0003] Normally, the failure types of t...

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Problems solved by technology

At the same time, the experimental data of the proportional valve shaft controller is limited, and in the case of small samples, the fault classification of the proportional valve shaft controller is prone to overfitting.

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