Hydraulic slide valve internal leakage detection method based on acoustic emission technology

Abstract

The invention belongs to the technical field of hydraulic slide valve internal leakage detection methods, and particularly relates to a hydraulic slide valve internal leakage detection method based onan acoustic emission technology. The method comprises the steps: collecting hydraulic slide valve internal leakage detection experiment data, carrying out wavelet packet decomposition on acoustic emission signals, serving obtained sub-band energy characteristics as input, serving the corresponding slide valve state and internal leakage amount as output, and optimizing parameters of a radial basiskernel function; training an optimization detection model; verifying the accuracy of a classification model; Verifying the accuracy of a regression analysis model. According to the hydraulic slide valve internal leakage detection method based on the acoustic emission technology, wavelet packet decomposition is carried out on the acoustic emission signals of a normal slide valve and an internal leakage slide valve, energy characteristics of all sub-bands are extracted, and a hydraulic slide valve internal leakage diagnosis database is constructed; according to the hydraulic slide valve internal leakage detection method based on the acoustic emission technology, the accuracy is higher, the prediction time is shorter, and the efficiency of non-intrusive detection of hydraulic slide valve internal leakage is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of internal leakage detection methods of hydraulic slide valves, and in particular relates to an internal leakage detection method of hydraulic slide valves based on acoustic emission technology. Background technique [0002] The hydraulic slide valve is the core control element of the hydraulic system. It is mainly used to control the on-off of the oil circuit and change the flow direction of the oil. It is widely used in various fields such as ships, chemicals, and military vehicles. Hydraulic spool valves have a high utilization rate, frequent opening, and long-term work in a high-temperature and high-pressure environment. These factors have greatly damaged the sealing surface, and the wear of the spool will increase the gap, thereby increasing the internal leakage of the spool valve and the system. It has a great impact on the security, work efficiency and economic value of the system. The current inter...

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Problems solved by technology

But at present, acoustic emission technology is still mainly used in gas leakage detection. For hydraulic valves and other problems related to the complexity of internal liquid flow state and signal attenuation of solid-liquid coupling, in a small number of theoretical research or experimental demonstration schemes, The accuracy and processing speed of its detection or prediction results are not ideal, and there is no relatively mature and effective method to apply acoustic emission technology

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