Compressors are used in refineries, chemical plants, generating stations and other major industries to transport gas. There are two main classes of compressor; the centrifugal and reciprocating compressor. Both produce high levels of noise but with very different characteristics.
Centrifugal compressor noise is produced primarily by blade-tip turbulence, which is a function of horse power, RPM, mass flow, discharged pressure, number of compression stages and type of gas. It is primarily a high frequency noise generator.
Centrifugal compressor noise is produced primarily by blade-tip turbulence. This is the interaction of rotating impeller blades with stationary diffuser vanes. Every time a blade passes a given point, the air or fluid at that point receives an impulse. Therefore, that point will receive impulses at a frequency equal to the number of impeller blades multiplied by the revolutions per second. The magnitude of the blade-tip frequency component is one of the largest contributors to the generated sound spectrum.
It's fundamental and harmonics are identifiable as discrete (tonal) spikes.
The noise produced by a reciprocating compressor is a function of horsepower, number of cylinders, bore, stroke, RPM and compression ratio. The reciprocating compressor generates a low frequency noise (pulsation).
Sonobex are currently designing portable bespoke solutions for gas compressors. The patented technology is tuned to address the tonal characteristics of compressor noise. Sonobex's solution suppresses the tonal characteristics of compressor noise, so in addition to reducing the overall sound level the nature of the noise is also perceived to be much less annoying.