We describe here a class of acoustic metamaterials with fractal Hilbert space-filling and coiled geometry equal tortuosity for noise mitigation. Experiments are performed using four-microphone impedance tube benchmarked against non-viscous viscothermal finite element models related to configurations spanning up five fractal/geometry orders. show that the absorption can be predicted by resonance...

Abstract In this study, sound absorbing materials were produced through foam forming technique using hardwood and softwood pulps with varying chemical composition, ultrastructural, morphological properties as raw materials. The absorption of the foams measured related to ultrastructure morphology pulp fibres. All fibre provided comparable those conventional porous used for acoustic purposes. ge...

The study of sound in the built environment is finding more awareness in the 21 century. As this awareness has increased, and as computing power has grown, the method of computer modeling for studying room acoustics in such settings as classrooms, offices, and performances spaces has taken great strides in recent years. Of particular interest has been the study of the coupled volume space due t...

The study of sound in the built environment is finding more awareness in the 21 century. As this awareness has increased, and as computing power has grown, the method of computer modeling for studying room acoustics in such settings as classrooms, offices, and performances spaces has taken great strides in recent years. Of particular interest has been the study of the coupled volume space due t...