Acoustic performance of a micro-perforated panel with an incompletely partitioned cavity
(MPPIPC) is investigated. A MPPIPC is achieved by inserting separators, which are shorter
than the depth of the cavity, periodically behind the micro-perforated panel (MPP). Due to
these separators, the sound field in the cavity is significantly changed. This paper reveals
these unique sound reflection modes among the separators, based on which a theoretical
model is proposed to calculate the absorption coefficient of a MPPIPC in the diffusion field …