Generally speaking, two major parameters are usually used to quantify the acoustic property of a MPP construction
the sound absorption coefficient and the normal acoustic impedance over its surface.
With MPP construction placed on a wall, both parameters
are widely used by treating the MPP as equivalent acoustic
boundaries. Those two quantities, however, may not truthfully
represent the in-situ working condition of the MPP when it is integrated
into a compact acoustic system. Recent work [16] showed
that two MPP constructions, one with a partitioned backing air
space and the other one without, give the same sound absorption
curves in the impedance tube test, but exhibit totally different
sound absorption behaviors when placed on the wall of a
Generally speaking, two major parameters are usually used to quantify the acoustic property of a MPP constructionthe sound absorption coefficient and the normal acoustic impedance over its surface.With MPP construction placed on a wall, both parametersare widely used by treating the MPP as equivalent acousticboundaries. Those two quantities, however, may not truthfullyrepresent the in-situ working condition of the MPP when it is integratedinto a compact acoustic system. Recent work [16] showedthat two MPP constructions, one with a partitioned backing airspace and the other one without, give the same sound absorptioncurves in the impedance tube test, but exhibit totally differentsound absorption behaviors when placed on the wall of a
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