c - sound velocity (m/s)
N - sound power (W)
r - distance from source (m)
D - directivity coefficient
The sound power generated from a wood planer is estimated to 0.01 W. The sound pressure in distance 10 m from the planner can be calculated as
Lp = 20 log ((D ρ c N / (4 π r2))1/2 / pref )
= 20 log (2 (1 kg/m3) (331.2 m/s) (0.01 W) / (4 π (10 m)2))1/2 / (2 10-5 Pa))
= 71 dB
Room acoustics and acoustic properties, decibel A, B and C, Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity and sound attenuation.
The propagation of outdoors sound vs. distance and attenuation.
The attenuation in a room depends on the location of the sound source and the receiver - and the room constant.
Sound power from sources like fans, jet engines, cars, humans and more.
Calculate the speed of sound (the sonic velocity) in gases, fluids or solids.
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