Investigation on use of Absorptive silencer in reduction Low-frequency noise Iranian axial fan
Message:
Abstract:
Background
Ventilation systems in buildings are one of the most important sources of noise, which are spread into the surrounding environment through fans and channels or distributors. Since axial fans are used in industry very much and silencers are among ways to voice control. The purpose of this study is investigation on use of Absorptive silencer in reduction Low-frequency noise Iranian axial fan.
Methods
In this study, we used galvanized channel 0.6 mm with 30*30 cm2 dimension and axial fan. Absorptive silencer as channel was designed to cross section of channel and silencers after embedded the absorber be identical together. Length of absorptive silencer was 50cm and there used mineral wool absorbent (density 80,100 Kg/m3 and thickness 5, 10 cm). To determine the sound pressure level in a channel, two microphones are embedded that be accomplished by using MATLAB software in the one third of octave broadband and variable speeds 600-2500 rpm. we investigate amount of the reduction in absorption silencer sound filled with Iranian absorbing materials and influence of thickness and density of adsorbent material in silence.
Findings
The maximum 2 dB reduction is in pressure sound at low frequencies of designed absorptive silencer that design in the channel surface. In this study, an increase in the thickness of the absorbent material of absorption silencer, there was a little change in the volume decreasing but with increasing density from 80 to 100 Kg/m3 better results were seen to reduce noise levels and it caused to increase NR rate.
Conclusion
According to data from the present study we can used silencer with 5cm thick and 100 Kg/ m3 density in the reduction of sound pressure level at frequencies lower than 250 Hz in the ventilation system as an effective device.
Language:
Persian
Published:
Journal of Health System Research, Volume:11 Issue: 2, 2015
Page:
250
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