Traffic noise has increased in recent years and hence the European Union has regulated
the noise emission norm more strictly. New technologies have to be developed to reach the …

Parallel connection is an effective way to improve the absorption performance of micro-
perforated panel (MPP) absorbers. A parallel MPP absorber usually consists of periodically …

Natural materials are becoming a reliable alternative to traditional artificial materials used in
sound absorption insulation. The present study was conducted to investigate the acoustic …

Recently, micro-perforated panels (MPP) have become a popular sound absorbing material
in the field of architectural acoustics. However, the cost of MPP is still high for the …

Analytical models for the sound absorption coefficient of MPP are extensively available
particularly for the cases where holes are regularly distributed across the MPP structure. The …

Micro-perforated panel (MPP) has been widely considered as a promising alternative for
sound absorption purposes. Plenty of research has been done to improve the sound …