Abstract
A common frostless household refrigerator was studied in anechoic and reverberation rooms to identify the relative importance of the various sound sources, the mechanism of the sound production, and methods for noise reduction. Good refrigerators are sufficiently quiet to cause measurement problems, yet, because they exist in such normally quiet environments, further noise reduction was necessary and methods for accomplishing this were found. There were four major noise sources: (1) internal circulating (evaporator) fan; (2) external (condenser) fan; (3) ice maker; and (4) compressor. The cavitation noise in the ice-maker valve was not examined. The internal fan was a significant noise source even with the door closed, owing to broad-band and discrete-frequency aerodynamic noise and also to vibrational and magnetic coupling. This result also applies to the external fan. Methods of noise reduction are discussed. Compressor noise was found to be due to radiation from the shell, which was coupled to the internal motor both vibrationally and acoustically. The high harmonic content of the compressor sound made it the most annoying of the sources, and some discussion of noise reduction is given.
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