Fault diagnosis method and system for range hood based on EMD (Empirical Mode Decomposition) noise reduction

Abstract

The invention provides a fault diagnosis method and system for a range hood based on EMD (Empirical Mode Decomposition) noise reduction. The fault diagnosis method comprises the following steps: performing de-noise processing on vibration signals which are collected during the operation of the range hood by adopting the empirical mode decomposition (EMD) method, so that the vibration signals after noise reduction are obtained; according to the vibration signals which are obtained after de-noise processing and extracted characteristics of the signals, performing fault diagnosis, so as to solve the problems that during the operation state monitoring of the range hood, noise reduction analysis on the vibration signals is carried out through integrated empirical mode decomposition (EMD) of non-stationary vibration signals, and the time-frequency characteristics of fault signals are extracted more accurately and rapidly, whether a fault is caused or not or the position of the fault can be determined, the finding and verifying time of fault locations is shortened, whether moving parts like a motor rotor and a wind wheel in the range hood have related failure problems or not can be rapidly diagnosed early without disassembling the overall range hood, both time and labor are saved, the fault diagnostic efficiency is improved, and the fault diagnosis accuracy degree is further improved.

Description

technical field [0001] The invention relates to the field of household appliance maintenance, in particular to a method and system for fault diagnosis of range hoods based on EMD noise reduction. Background technique [0002] The composition of the noise produced by the range hood during stable operation is relatively complex, and its main noise source comes from its fan components (such as: motor rotor and wind wheel and other moving parts). Specifically, the fan assembly (that is, the power system or the electromechanical system inside the range hood) includes: a motor (such as: a motor rotor), a volute, a centrifugal fan blade and other components. Among them, part of the source of noise is the mechanical vibration noise of moving parts such as motor rotor and wind wheel, which often contains potential fault symptom information. Specifically, in the power system where the moving parts such as the motor rotor and wind wheel are located, during the start-up process, the vi...

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a method and system for fault diagnosis of range hoods based on EMD noise reduction, so as to solve the problem of using an integrated EMD (empirical mode decomposition) method of non-stationary vibration signals in monitoring the operating status of range hoods. Carry out noise reduction analysis of vibration signals, more accurately and quickly extract time-frequency characteristics of fault signals, etc., to determine whether there is a fault or the location of the fault, save time for finding and verifying the fault location, and quickly diagnose the range hood at an early stage Whether there is a relevant fault problem in the moving parts such as the rotor of the motor and the wind wheel (mainly the power system of the range hood), there is no need to disassemble the whole machine, which saves time and effort, improves the efficiency of fault diagnosis, and improves the accuracy of fault diagnosis Spend

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