A keyless phase angle domain period segmentation method for reciprocating compressor signals

Abstract

A keyless phase angle domain period segmentation method of a reciprocating compressor signal belongs to the technical field of fault diagnosis of a reciprocating compressor. Aiming at the problem that the key phase signal is abnormal or even lost in the actual on-line monitoring of the reciprocating compressor, the fault diagnosis and analysis cannot be carried out, and the whole cycle interception of the signal is completed by mining the effective information inside the signal itself. It includes steps: 1) obtaining vibration signals and converting them into images; 2) determining the size of the interception window; 3) identifying the opening impact of the air valve; 4) calculating the phase of the air valve opening and intercepting the whole cycle signal. The method realizes the whole cycle re-segmentation of the collected compressor original signal without installing the key-phase sensor or the failure of the key-phase sensor. It saves the high cost of key-phase equipment and avoids the failure of the online monitoring system to perform effective diagnosis and the failure of the gas volume control system due to the failure of the monitoring equipment, which effectively improves the reliability of the compressor monitoring and control system.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis of reciprocating compressors, and relates to a keyless phase angle domain periodic segmentation method based on a mechanism model and an image similarity recognition technology, which can perform data acquisition without installing a key-phase sensor or in the case of a key-phase sensor failure. The original signal of the compressor is divided into a whole cycle, which is convenient for subsequent air volume adjustment and fault diagnosis. Background technique [0002] The reciprocating compressor is a common core power device with a large number of applications in petrochemical and other industries. Safety production and energy saving and consumption reduction are the long-term needs of enterprise compressor equipment. On-line monitoring, diagnosis and optimization control are important for compressor equipment. Sex speaks for itself. The basis of monitoring and diagnosis technology and ...

AI Technical Summary

Problems solved by technology

The reciprocating compressor diagnostic system usually installs the key photo on the flywheel position by cranking. Although the key phase sensor is not greatly affected by the vibration of the fuselage and the failure rate of the sensor itself is low, due to the short maintenance cycle of the compressor, it is difficult to It is easy to cause the key phase sensor to be misplaced or even the key phase sticking block to fall off; on the other hand, due to the change in the installation angle of the flywheel or coupling after the reciprocating compressor is overhauled, the key photo will deviate between the position of the flywheel and the position of the top dead center of the piston. These will lead to abnormal key phase signal

[0004] Once the key phase sensor and signal path fail, the online monitoring system will not be able to perform effective diagnosis and the gas volume control system will fail

In addition, because its installation position is close to the flywheel and it is an explosion-proof charged component, the key phase sensor cannot be disassembled and replaced immediately when it fails. It must be completely shut down and the cabinet is powered off before maintenance and replacement can be performed. Reliable application of technical systems poses great difficulties

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