Enhancing nonwoven fabric material sound absorption using embedded labyrinthine rigid structures

Extremely tortuous sound absorbers with labyrinthine channels in non-porous and microporous solid skeletons

“…This paper describes the theoretical basis, analytical models and rigorous numerical and experimental validation of such extremely tortuous modular acoustic composite materials involving labyrinthine channels within both non-porous and microporous matrices. Note that this design is fundamentally different from acoustic composite with internal labyrinthine structures formed by thin, impermeable, rigid walls embedded in a porous matrix, usually made of conventional acoustic foams or wools [17][18][19][20].…”