Method for diagnosing fault of fire pump based on acoustic emission signals

Abstract

The invention provides a method for diagnosing fault of a fire pump based on acoustic emission signals, which aims to solve the problem of fault diagnosis of fire pumps, and uses concrete methods and steps that an acoustic emission sensor detects signals of a fire pump, and collects acoustic emission signals of the fire pump with distortion characteristics in the running state of the fire pump, and narrow-band signals in the acoustic emission signals are extracted by utilizing a band-pass filter, are directly orthogonally normalized and calculated to obtain instantaneous frequency, and are variably sampled and corrected point by point according to the obtained instantaneous frequency at last, thereby obtaining correction signals. Then the correction signals are analyzed by utilizing a transient component analysis method, firstly parameterization cycle transient wavelets are built based on unilateral laplace wavelets in a parameter domain, then the built parameterization cycle transient wavelets are matched with the correction signals for analysis based on a most relevant law, fault characteristic information is extracted, and at last faults are classified according to the fault characteristic information, thereby achieving fault diagnosis.

Description

technical field [0001] The invention relates to a fault diagnosis method of a fire water pump based on an acoustic emission signal. Background technique [0002] The fire pump is the most important part of the fire equipment, and its performance has a direct impact on the reliability of the entire fire equipment. Once the fire pump fails, the vibration and noise will increase, which will accelerate the loss of its equipment and reduce work efficiency; if it is serious, the entire building's fire protection facilities will stop working, causing serious accidents. Ensuring that the fire pump is in good condition and available throughout its life cycle is an important means to effectively ensure timely fire control. Therefore, performance testing and fault diagnosis of fire pumps are of great significance in industrial applications. Due to the incompressibility of the fluid, the fluid-solid coupling effect between the pump source and the pump circuit, and the large inherent me...

AI Technical Summary

Problems solved by technology

However, it is more difficult to detect the fault of the fire pump under normal operation, because the acoustic emission signal has transient randomness, and due to the influence of strong noise and steep distortion, the fault characteristic frequency of the fire pump may not be detected

In view of such limitations, it is difficult for traditional fire pump fault diagnosis methods to make a more accurate evaluation of the working status of fire pumps.

Images