Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! 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) 1 No enclosure or barrier, machine alone 0 2 Machine on vibration isolators ≈ 2 3 Machine with barrier ≈ 5 4 Machine in a rigid and sealed enclosure ≈ 20 - 25 5 Machine in a rigid and sealed enclosure with sound absorption lining on inside walls - machine on vibration mounts ≈ 40 - 45 Related Topics Room acoustics and acoustic properties, decibel A, B and C, Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity and sound attenuation. Related Documents 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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