Infrasound noise radiated from vibrating screens at an ore refinery: Part 1 - Problem analysis and small scale model design
Keywords:Acoustic noise, Noise pollution, Refining, Vibrating screens, Acoustical pressure, Building structure, Coarse particles, Infrasound, Infrasound levels, Infrasound noise, Noise mapping, Problem analysis, Radiating pattern, Small-scale models, Sound pressures, Vibrating plate
AbstractAn infrasound problem has been identified at an ore refining factory. Despite being inaudible, the infrasound levels are high enough to generate discomfort among workers and to generate vibration in the building structure. Noise mapping techniques were used to highlight the radiating patterns and measure the performance of tested solutions. The vibrating screen consists of a concave shaped vibrating plate. The ore inflow comes at the top of the screen and the coarse particles go out at the bottom. The screened particles are collected using a pyramidal shaped hopper. Acoustical short-circuits, or holes in the screen plate were made in order to equilibrate the acoustical pressure on each side of the screen plate. The holes also reduce the radiating area of the screen plate reducing even more the generated sound pressure.
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