20.500.12556/RUL-171273 Phase velocity measurements of sound in granular media a time-domain approach based on deconvolution This study presents a novel method for measuring phase velocities of airborne sound in porous materials, focusing on granular media. Using a single-microphone setup within an extended impedance tube, a time-domain method based on spectral division deconvolution was developed to isolate and analyse transmitted sound waves. Granular materials, including various size fractions of recycled silica sand, were used to investigate the frequency-dependent speed of sound and associated phase velocities, addressing the need for efficient, scalable techniques for measuring high-transmission-loss media. Results revealed that phase velocities in granular materials are highly dependent on particle size, with smaller granules exhibiting higher high-frequency tortuosity limits. The measured sound absorption values aligned closely with predictions from the Johnson-Champoux-Allard-Lafarge (JCAL) model for larger granules, though deviations were observed for smaller fractions due to structure-borne resonances. The proposed method proves effective for measuring phase velocities in granular media, offering a streamlined alternative to traditional approaches. Future research could apply this technique to other granular media and refine it for a broader range of environmental conditions. The efficiency and scalability of this method make it a valuable tool for advancing acoustic studies of porous materials. time-domain wave decomposition deconvolution granular materials phase velocity high-frequency tortuosity limit true false true Angleški jezik Ni določen Članek v reviji 2025-08-21 14:33:32 2025-08-21 14:33:41 2026-06-13 04:29:36 0000-00-00 00:00:00 2026 0 0 9 str. Vol. 241, art. 111018 Jan. 2026 0000-00-00 Zaloznikova Objavljeno apc 0000-00-00 0000-00-00 0000-00-00 534/535 0003-682X 10.1016/j.apacoust.2025.111018 246234627 1-s2.0-S0003682X25004906-main.pdf 1-s2.0-S0003682X25004906-main.pdf 1 4ED71E98490E45DF3EC878D835CC63C3 95e3891a10947b9f7896ae8f7e35431eb41b5176809fc71116adcb5ace1d2fff 151f2955-663f-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=235453 https://www.sciencedirect.com/science/article/pii/S0003682X25004906 1 f7fcbb48-7e8a-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=214477 Fakulteta za strojništvo 0 0 0