Infrasound noise radiated from vibrating screens atan ore refinery: Part 2 - Noise reduction treatments and noise mapping technique
Keywords:Hoppers, Noise pollution, Refining, Vibrating screens, Color scale, Full scale, Global levels, High pressure levels, Infrasound, Infrasound noise, Large vibrating screen, Noise map, Noise mapping, Operating ranges, Potential solutions, Radiating pattern, Scale models, Sound source
AbstractAn infrasound problem has been identified at an ore refining factory and large vibrating screens were identified as the dominant source. In order to evaluate potential solutions allowing to reduce the screens' acoustical emission, a 1:15 scale model was built to be tested in laboratory. Noise mapping techniques were used to highlight the radiating patterns and measure the performance of tested solutions. The displayed value is the sound intensity global level ranging from 205 to 235 Hz which represents the 13.5 to 15.5 Hz operating range for the full scale vibrating screen and the color scale ranges from 65 to 85 dB. The noise maps were performed at a 15 cm distance from the sound source. The lack of acoustical short-circuit generates a high pressure level in the hopper and the leak at the hopper's perimeter radiates the energy to the outside.
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