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Barriers and enclosures to reduce noise sound pressure levels from machines.
The noise levels from machines can be reduced with barriers or enclosures as indicated below:
Noise from Machines - Enclosures and Sound Pressure Level Reductions
Type of Enclosure Sound Pressure Level Reduction ( dBA)
No enclosure or barrier, machine alone
Machine on vibration isolators
Machine with barrier
Machine in a rigid and sealed enclosure
≈ 20 - 25
Machine in a rigid and sealed enclosure with sound absorption lining on inside walls - machine on vibration mounts
≈ 40 - 45
Room acoustics and acoustic properties, decibel A, B and C, Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity and sound attenuation.
The sound generated by a fan depends on the motor power, the volume capacity, the static pressure increase and the discharged volume.
The transmission of outdoor sound through and around barriers - the Fresnel Number.
In a room the sound or noise will reach the receiver as direct and reverberant sound.
Doubling of the distance from a noise source reduces the sound pressure level with 6 decibel.
Sound transmission and attenuation in building elements like massive concrete walls or floors.
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Noise from Machines - Enclosures and Sound Pressure Level Reductions. [online] Available at: https://www.engineeringtoolbox.com/machines-sound-level-reduction-d_1411.html [Accessed Day Month Year].
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