Analysis of Absorption Values and Absorption Coefficients of Materials: Particle Board, Plywood, and Dutch Teak Wood

Abstract

Acoustic performance is strongly influenced by the ability of materials to absorb sound across different frequency ranges. This study investigates the absorption values and absorption coefficients of three wood-based materials particle board, plywood, and Dutch teak wood at audio (1.2–3 kHz) and ultrasonic (35–45 kHz) frequencies. Experimental results show that particle board exhibits the highest absorption in the audio range, attributed to its porous structure that effectively attenuates sound waves. Plywood demonstrates variable absorption behavior, with superior performance at higher ultrasonic frequencies. Dutch teak wood displays the most stable acoustic response across both ranges, achieving the highest absorption coefficient of 1.51 at 35 kHz. Additional analysis of density and moisture content indicates that porosity and humidity significantly affect sound absorption characteristics. Overall, the findings provide a comparative basis for selecting wood-based materials in acoustic applications, including architectural design and soundproofing products, and suggest further research on the influence of environmental factors on absorption capacity.