Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (7): 1929-1934.doi: 10.13229/j.cnki.jdxbgxb.20220213

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Idle noise diagnosis algorithm of air-conditioning refrigeration compressor based on wavelet packet extraction

En-shen LONG(),Guang-ze BAN   

  1. College of Architecture and Environment，Sichuan University，Chengdu 610065，China
  • Received:2022-03-04 Online:2023-07-01 Published:2023-07-20

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Abstract:

When the vehicle is idling， the large noise of the air conditioning refrigeration compressor is the low-frequency abnormal noise of the compressor. The idle noise of air conditioning refrigeration compressor has randomness and uncertainty， so its diagnosis is difficult. In order to find the compressor abnormality in time and provide a more comfortable driving and riding environment， the idle noise diagnosis algorithm of air conditioning refrigeration compressor based on wavelet packet extraction is studied. The characteristics of idle noise signal of air-conditioning refrigeration compressor are extracted by wavelet packet， and then the characteristics of idle noise signal of air-conditioning refrigeration compressor are classified by support vector machine （SVM）. According to the classification results of noise signal characteristics， the diagnosis of idle speed noise of air conditioning refrigeration compressor is realized. The experimental results show that the idle noise amplitude of air conditioning refrigeration compressor obtained by the proposed method is closer to the actual idle noise amplitude， and the area of ROC curve is large， which shows that the research algorithm has ideal accuracy for the diagnosis result of compressor idle noise.

Key words: air conditioning refrigeration compressor, idle noise, wavelet envelope, feature extraction, support vector machine

CLC Number: 

  • U463.8

Fig.1

Changes of idle noise after passive increase ofacceleration signal"

Fig.2

Idle noise variation after operating frequency of air?conditioning refrigeration compressorincreases"

Fig.3

Three models of air-conditioning refrigerationcompressors from different companies"

Table 1

Specific parameters of three types of air-conditioning refrigeration compressorsfrom different companies"

压缩机编号制冷剂气缸容积/cm3制冷量/W输入功率/W电机类型油的粘度
1#R125.6132120YUR32
2#R134a5.85575RSIR22
3#R125.9137134RSCR35

Fig.4

Comparison of idle noise amplitude and actualidle noise amplitude under differentdiagnosis methods"

Fig.5

ROC curves under different diagnosis methods"

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