20.500.12556/RUL-166794 Estimation of sound absorption coefficient at modal frequencies using decay time measurements and eigenvalue model in a small room Measuring the sound absorption coefficient in a small reverberation room below the Schroeder frequency is a challenging task and the results are subject to a high degree of uncertainty. Recent research shows that the low-frequency acoustic properties of the enclosure and the test sample should be characterized by quantities that describe the modal sound field. The aim of this paper is to present a method for estimating the absorption coefficient of a test sample at modal frequencies in the low frequency range and to demonstrate its applicability in a small room. The hybrid inverse approach is based on eigenvalue measurement data coupled with a finite element model to estimate the sound-absorbing properties of a small room and the test sample. The method was tested experimentally and the results were consistent with those of the long impedance tube method. The applicability of the proposed method was further demonstrated by the in-situ characterization of different acoustic samples in the low frequency range. small room sound absorption low frequency time-frequency method finite element method decay time material characterization majhna odmevnica absorpcija zvoka nizkofrekvenčno območje časovno-frekvenčna metoda metoda končnih elementov upadni čas karakterizacija materialov true false true Angleški jezik Slovenski jezik Članek v reviji 2025-01-24 14:25:55 2025-01-24 14:25:59 2025-01-25 04:13:11 0000-00-00 00:00:00 2024 0 0 Str. 1530-1544 iss. 3 Vol. 43 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 534:519.62 2048-4046 10.1177/14613484241258622 197944323 Curovic_..._Estimation_of_sound_....pdf Curovic_..._Estimation_of_sound_....pdf 1 2B20AC9B48C1C630432E8A46B5BEA3DB 3fb7b6fd6397cfce99e80a2180b6cc558ebce7a788362e298f70693c27100bff 45848421-da56-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=198708 https://journals.sagepub.com/doi/10.1177/14613484241258622 1 f32c4ba3-da55-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=198707 Fakulteta za strojništvo 0 0 0