Variable frequency scroll compressor fault diagnosis method based on improved VMD and SVM

Abstract

The invention discloses a variable frequency scroll compressor fault diagnosis method based on improved VMD and SVM, and the method carries out the processing and analysis of a vibration signal of a variable frequency scroll compressor from three aspects: signal processing, feature extraction and classification recognition, and comprises the steps: firstly carrying out the vibration test of the variable frequency scroll compressor; acquiring vibration acceleration signals under different states of normality, scroll plate faults, bearing faults and crankshaft faults of the variable-frequency scroll compressor, and obtaining data samples of different fault types; taking the envelope entropy-correlation index as a fitness function, adopting a sparrow search algorithm (SSA) to optimize a variational mode decomposition (VMD) algorithm to process the vibration signal of the variable frequency scroll compressor, and obtaining intrinsic mode functions of different scales; and calculating multi-scale permutation entropies of different intrinsic mode functions to form a feature vector, inputting the feature vector into a classifier established based on a support vector machine (SVM) for training and predictive classification, and judging the fault type of the variable-frequency scroll compressor.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis of variable frequency scroll compressors, in particular to a fault diagnosis method for variable frequency scroll compressors based on improved VMD and SVM. Background technique [0002] With the continuous development of the economy, the variable frequency scroll compressor is a key mechanical equipment widely used in industrial production. It is widely used in new energy vehicle air conditioning, refrigeration, air compression and other systems, and the application field is still expanding. Since the operating state of the variable frequency scroll compressor fundamentally determines the service life of the entire system, and with the change of working hours, its performance indicators are also changing, and the vibration parameters are common faults of the variable frequency scroll compressor feature. Therefore, the analysis of vibration signals is a common means of fault diagnosis, wh...

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Problems solved by technology

Although the above methods have achieved some good results in the field of scroll compressor fault diagnosis, there are still some problems that make it difficult to achieve the desired results.

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