A low-frequency hum from a large vibratory wood scrap process sieve was the cause of extensive complaints. The very low frequency (11.8Hz) meant that conventional noise control measures such as acoustic enclosures and barriers could not be effective (the wavelength of sou d at this frequency is 29m!).
Whilst this tonal frequency is inaudible, the effects that cause complaints are usually rattles and reflections in objects, for example...
Vibratory screen noise effect videos:
We developed innovative engineering noise control measures for the vibrating screen that reduced the problem low-frequency hum by a very remarkable (and probably record-breaking) 99.999% (50dB). The modifications were implemented within a day, were low cost and had no effect on normal operation or throughput.
This engineering vibrating screen noise control technology is applicable to a wide range of applications - contact us if you'd like to discuss a particular project.
We have also generated a comprehensive technical note on all aspects of vibratory feeder, hopper, conveyor, separator and sieve noise...
Other examples of our engineering vibratory system noise reduction technology include:-