Sound energy flux
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|Sound pressure p, SPL|
|Particle velocity v, SVL|
|Particle displacement ξ|
|Sound intensity I, SIL|
|Sound power Pac|
|Sound power level SWL|
|Sound exposure E|
|Sound exposure level SEL|
|Sound energy density E|
|Sound energy flux q|
|Acoustic impedance Z|
|Speed of sound|
|Audio frequency AF
Sound energy flux (the energy produced by an object's vibrations, symbolized as q) results from the integral of the acoustic pressure p times the particle velocity v over a surface A , and is given by the integral below.
The sound energy flux is the average rate of flow of sound energy for one period through any specified area A and is usually referred to as acoustic intensity.
- J = (p2A / ρ v) cos θ
where θ = the angle between the direction of propagation of the sound and the normal to the area A.
This is the parameter one would be interested in when converting noise back into usable energy, along with any losses in the capturing device.
For example a sound at 85 dB or 0,356 Pa in air (ρ=1,2 kg/m3; v=343 m/s; A=1m2;cos θ =1 ) has a sound energy flux of 0,3 mW
- Landau & Lifshitz, "Fluid Mechanics", Course of Theoretical Physics, Vol. 6
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