A Fault Diagnosis Method for Fire-fighting Water Pumps Running at Low Speed

Abstract

The invention provides a fault diagnosis method for a fire pump operating at a low speed. The fault diagnosis method aims to achieve fault diagnosis of the fire pump operating at a low speed at the non-fire state. The fault diagnosis method includes the specific steps that a high-frequency stress wave sensor carries out signal detection on the fire pump at the inspection state; a high-frequency stress wave composite signal, containing noise, of the fire pump operating at a low speed is collected; the signal is processed through a FastICA algorithm, and a source signal is estimated; the Hilbert-Huang Transform is carried out on the estimated signal, and an n-order intrinsic mode function and a Hilbert spectrum of a fault signal are obtained to serve as a feature vector for judging the state of the fire pump and recognizing faults; finally, a support vector machine is utilized for classifying the faults. The fault diagnosis method is suitable for processing non-linear and non-stable signals under the situation of a low speed, more complete fault features can be obtained, and the fault diagnosis effect is better.

Description

technical field [0001] The invention relates to a method for fault diagnosis of a fire-fighting water pump operating at a low speed. 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 fire protection facilities will stop working, and even cause serious accidents. It is effective to ensure that the fire pump is in good condition throughout its life. It is an important means to ensure timely control of fire, so the 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 between the pump source and the pump circuit, and the large inherent mechanical vibr...

AI Technical Summary

Problems solved by technology

However, it is more difficult to detect faults for water pumps rotating at low speeds, and traditional vibration measurement methods will fail, because vibration methods may not be able to detect the fault characteristic frequency of water pumps, and when components of low-speed rotating machinery fail little impact

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

Images