Autex Research Journal · 2003 · 141 citations · 0 references
Natural SciencesMaterials EngineeringMaterials ScienceAcousticsPolymer EngineeringPolymer MaterialsAcoustic MaterialsAcoustic MeasurementAcoustic PerformancePhysical AcousticsRecycled MaterialsSound AbsorptionAcoustic Absorption MaterialsFibrous AbsorbersImpedance MeasurementImpedance Tube MeasurementResonant AbsorbersSound Absorption CoefficientSound Absorption MaterialsSound Absorption Measurement
Sound absorption materials are classified into porous, resonator, and panel types, all relying on converting sound energy to thermal energy, and recycled polyester nonwovens offer cost, handling, and environmental advantages over conventional absorbers. The study aims to evaluate recycled polyester nonwovens as substitutes for conventional glasswool and rockwool absorbers. The absorption coefficient was measured using a two‑microphone impedance tube, quantifying the material’s absorption energy rate relative to incident energy. Measured absorption values correlate with nonwoven fiber and web properties, establishing a relationship between acoustic performance and material characteristics.
Abstract Sound absorption materials are generally classified into three types, porous, resonator, and panel. All of these three types are based on the theory of energy transforming from sound energy to thermal energy. In this paper, we examined the sound absorption coefficient of recycled polyester nonwovens for the purpose of substituting the conventionally used materials such as glasswool and rockwool. The use of recycled polyester nonwovens has many advantages compared to conventional sound absorbers, including reduced product cost, good handling, and environmental protection. The sound absorption coefficient of the recycled polyester nonwovens was determined by a two-microphone impedance measurement tube; the determination of the noise absorption coefficient is nothing more than the absorption energy rate of the material against the incidence energy. We have determined the relationship between the acoustic absorption values measured and the nonwoven parameters including fibre properties and web properties.