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Noise source identification of the hermetic reciprocating compressor for refrigerator

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Abstract

Noise source identification of the hermetic reciprocating compressor for refrigerator has been investigated. Since the compressor shell housing is designed as airtight chamber to suppress refrigerant gas coming into contact with outside atmosphere, behaviors of the compression driving part are difficult to observe. So far, noise generation mechanism of the hermetic reciprocating compressor is studied by empirical estimation or intuitive consideration. Therefore, novel approach is required to figure out the relationship between compression process and noise generation. In this paper, behavioral features of primary components such as valve system and cylinder pressure are investigated by using the custom-designed compressor. Noise characteristics are clarified by measurement of another mass-produced compressor, separately. In order to identify the relation between compression procedure and noise generation simultaneously, synchronization of measured time signals is carried out. Short time Fourier transform (STFT) analysis is performed to verify noise generation mechanism with respect to both time and frequency domains. In addition, correlation between operating speed and noise characteristics is considered as the reciprocating compressor drives at various speed according to operating conditions of the refrigerator.

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Abbreviations

D :

Diameter of piston

L :

Length of connecting rod

P c :

Cylinder pressure

R :

Eccentricity of crankshaft

V 0 :

Top clearance volume

V c :

Cylinder volume

x c :

Position of crankshaft in x-direction

x p :

Position of piston in x-direction

y c :

Position of crankshaft in y-direction

y p :

Position of piston in y-direction

α :

Tilting angle of connecting rod

γ :

Polytropic index of the refrigerant gas

ω :

Rotating speed of motor

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Acknowledgments

This work was supported by the BK21 Program funded by the Ministry of Education (MOE, Korea) and National Research Foundation of Korea (NRF-4199990513944).

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Authors and Affiliations

  1. LG Electronics, Gasan Digital 1-ro 51, Geumcheon-gu, Seoul, Korea

    Youngboo Son

  2. Department of Aerospace Engineering, Seoul National University, Gwanak-ro 1, Gwanak-gu, Seoul, Korea

    Jihun Choi & Soogab Lee

  3. Institute of Engineering Research, Gwanak-ro 1, Gwanak-gu, Seoul, Korea

    Soogab Lee

Authors
  1. Youngboo Son
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  2. Jihun Choi
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  3. Soogab Lee
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Corresponding author

Correspondence to Soogab Lee.

Additional information

Youngboo Son is currently a Professional Research Engineer of LG Electronics. He received B.S. and M.S. degrees in Mechanical Engineering from Sungkyunkwan University, Suwon, Korea. His research interests are noise and vibration of home appliance.

Jihun Choi is currently a Ph.D. candidate in Seoul National University. He received his M.S. degree in Aerospace Engineering from Seoul National University, Seoul, Korea. His research intersets are noise analysis and control of Home appliance.

Soogab Lee is a Professor in the Department of Aerospace Engineering at Seoul National University. He received his Ph.D. in Aeronautics and Astronautics from Stanford University in 1992. He worked as a research scientist at NASA Ames Research Center from 1992 to 1995. His research interests are in the area of aerodynamics and acoustics of rotating machines including wind turbine systems.

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Son, Y., Choi, J. & Lee, S. Noise source identification of the hermetic reciprocating compressor for refrigerator. J Mech Sci Technol 35, 4849–4858 (2021). https://doi.org/10.1007/s12206-021-1004-3

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  • DOI: https://doi.org/10.1007/s12206-021-1004-3

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