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Noise from Machines - Enclosures and Sound Pressure Level Reductions

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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 EnclosureSound 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
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Related Topics

Acoustics

Room acoustics and acoustic properties. decibel A, B and C calculations. Noise Rating (NR) curves. Sound transmission through walls. Calculate sound pressure, sound intensity and sound attenuation.

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The sound generated by a fan depends on the motor power, the volume capacity, the static pressure increase and the discharged volume.

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The transmission of outdoor sound through and around barriers - the Fresnel Number.

Propagation of Sound Indoors - the Room Constant

In a room the sound or noise will reach the receiver as direct and reverberant sound.

Sound Propagation - the Inverse Square Law

Doubling of the distance from a noise source reduces the sound pressure level with 6 decibel.

Sound Transmission through Massive Walls or Floors

Sound transmission and attenuation in building elements like massive concrete walls or floors.

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