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Acoustics->porous sheet in front of a wall, what is the incident sound power absorbed
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[QUOTE="acousticsnoob, post: 2496283, member: 213063"] [h2]Homework Statement [/h2] A sheet of porous material is suspended in air at a distance of 1/4 wavelength in front of a rigid wall. For the frequency of interest, the mass of sheet is high enough not to move significantly under the influence of a sound wave. When a constant frequency plane wave is normally incident on the sheet, a microphone behind it at the wall surface registers an rms value of 0.2 Pa. What is the specific flow resistance of the sheet? [h2]Homework Equations[/h2] Vfront-Vsheet=Vback-Vsheet= (1/Rf) x (Pfront-Pback) Pback=0.2 Pa (Given) We need to find Rf=specific flow resistance. [h2]The Attempt at a Solution[/h2] I think that Vsheet=0 since the pressure is not enough to move the sheet. we don't know Pfront. [/QUOTE]
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Acoustics->porous sheet in front of a wall, what is the incident sound power absorbed
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