Loud sounds made from machine now become part of occupation hazard for works who expose it in extend of time period. It how have regulate by government because the consideration of the machine design.
GN Solids America LLC's decanter centrifuge is the machinery with rotating bowl and contain many number source of sounds . The size of the machine, the speed of the rotating bowl, which is the main source of noise come from structure. Other sound like turbulence sound and siren sound is also part of sound production from the decanter centrifuge.
Structure sound often produce by all surfaces that directly coupled to the bowl's bearing. The speed of rotation of the bowl, it create turbulence from the different trailing edges that produce broad spectrum vortex sound. The siren sound is from air flow through the bowl and it produce great noise especially at the lower harmonics of the bowl rotate frequency.
There are ways to decrease sound that produce by decanter centrifuge, some of them are:
· Decoupling the surface of the main bearing of the rotating bowl and will reduce the amount of noise transmitted from the decanter centrifuge structure
· Polish and smooth the bowl surface will minimize the noise produce from the edge that vortices that shed and produce vortex, turbulence noise
· Siren sound produce because from the air flow through rotating bowl, which is the purpose to the function of the decanter, the exit opening should be design so the noise is produce within the parts of spectrum of sound have low noise level
The sound that produce from machinery is consider health hazard if personal consistently exposure on sound that is great then 80 to 85 dB over an eight hours per day. Excess expose of level of 85 dB during work life would result 90% of people suffer lost of hearing. It can also damage the way of speech as well. Which now sound regulation is the must enforce regulation.