Fault diagnosis method of air valve for reciprocating compressor based on statistical learning theory

A statistical learning theory and fault diagnosis technology, applied in the field of compressors, can solve the problem that there is no complete set of fault diagnosis methods for the vibration signal of the air valve, and achieve accurate diagnosis, high classification accuracy and high accuracy. Effect

Pending Publication Date: 2021-12-28
HEFEI GENERAL MACHINERY RES INST
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Problems solved by technology

According to statistics, about 60% of the faults of reciprocating compressors are caused by air valves. Therefore, it is of practical significance to ca

Method used

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  • Fault diagnosis method of air valve for reciprocating compressor based on statistical learning theory
  • Fault diagnosis method of air valve for reciprocating compressor based on statistical learning theory
  • Fault diagnosis method of air valve for reciprocating compressor based on statistical learning theory

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Effect test

Embodiment 1

[0044] Test object: The reciprocating compressor is a DW-8 / 10 two-stage air compressor manufactured by Sichuan Jinxing Compressor Co., Ltd., and its air valve is a two-stage exhaust valve;

[0045] Test object parameters: DW-8 / 10 type two-stage air compressor with a volumetric flow rate of 8m 3 , air supply volume 480Nm 3 / h, exhaust pressure 1.0Mpa. The air valve is a three-ring annular air valve.

[0046] Collection method: through PCB EXM 608A11 model sensor and NI 9234 board collection.

[0047] Experimental procedure:

[0048] In order to collect the vibration test data of the reciprocating compressor under different conditions, the valve plates of the normal state and four kinds of fault states are installed on the fault diagnosis test bench of the reciprocating compressor to carry out the fault simulation test. The four fault states of the valve plate are the sawing fault of the inner ring, the fault of two petals of the inner ring, the fault of two petals of the in...

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Abstract

The invention belongs to the technical field of compressors, and particularly relates to a fault diagnosis method of an air valve for a reciprocating compressor based on a statistical learning theory. The method comprises the following steps: determining the degree of each data point belonging to a certain cluster; optimizing the objective function through iteration, obtaining the degree of membership of each clustering center and each data point to each class, and classifying samples; realizing the data classification by searching an optimal classification hyperplane; obtaining a dual problem and a classification decision function; constructing a kernel function classifier by utilizing a radial basis kernel function, and solving a dual problem by adopting a sequence minimum optimization algorithm; solving a clustering center of each subset; obtaining M-1 support vector machines SVM1,..., SVMM-1, and forming a root node and an intermediate node of the binary tree; training the support vector machines one by one, optimizing a radial basis kernel function parameter gamma and a penalty parameter C, and realizing fault diagnosis of the air valve for the reciprocating compressor. Therefore, accurate diagnosis of the fault of the air valve can be efficiently realized.

Description

technical field [0001] The invention belongs to the technical field of compressors, and in particular relates to a fault diagnosis method for an air valve used in a reciprocating compressor based on statistical learning theory. Background technique [0002] Reciprocating compressors are among the most commonly used machinery in chemical production processes in the oil and gas industry. With the continuous improvement of high performance and high safety requirements, ensuring its operation safety has become an important research topic. Vibration-based measurement and analysis techniques have been proven to be very effective in machinery health monitoring and fault diagnosis; because vibration signals can reflect a large amount of operating status information when equipment is in service, using some analysis methods can successfully detect Faults in rotating machinery such as gearboxes and bearings. However, due to factors such as gaps, nonlinear stiffness of bearings, unbal...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/62F04B51/00G01M13/003
CPCG01M13/003F04B51/00G06F2218/06G06F2218/08G06F2218/12G06F18/23213G06F18/214G06F18/24323
Inventor 舒悦肖军朱全琛何明刘晓明刘志龙曹斌方燚孙瑞亮李豪李奉誉
Owner HEFEI GENERAL MACHINERY RES INST
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