Whether or not compressor sound level changes with run time is of importance from quality control and field application standpoints. While it is a widely accepted notion that compressor run time normally helps improve sound, studies on this particular subject is scarce. This paper examines if rotary compressor sound indeed changes with run time and, if does, how does it change. Not only overall sound level but also change in different frequency bands are characterized in this study presented. Certain frequency bands are more sensitive than others to compressor run time. Significance of run time, life test condition, compressor sound with loss of performance and other parameters are discussed.
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