@article {Sakamoto:2018:0736-2935:3237,
title = "Sound-Absorbing Materials using of Rice Straws (Oblique Incident Sound-Absorption Coefficient of Oblique Arrangement of Hollow Cylindrical Biomass)",
journal = "INTER-NOISE and NOISE-CON Congress and Conference Proceedings",
parent_itemid = "infobike://ince/incecp",
publishercode ="ince",
year = "2018",
volume = "258",
number = "4",
publication date ="2018-12-18T00:00:00",
pages = "3237-3249",
itemtype = "ARTICLE",
issn = "0736-2935",
url = "https://ince.publisher.ingentaconnect.com/content/ince/incecp/2018/00000258/00000004/art00028",
author = "Sakamoto, Shuichi and Tsurumaki, Taisei and Fujisawa, Kohei and Yamamiya, Koki",
abstract = "It was reported the use of sound-absorbing materials, specifically sound-absorbing structures of bundled rice straws, that are oblique arranged incident to the sound waves. In addition, we investigated the normal and oblique incident sound-absorption coefficients of sound-absorbing
structures made of bundled rice straws in free space. In this study, we placed sound-absorbing structures made of bundled rice straws at an angle against the direction of the thickness in order to elongate the rice-straw element without increasing the apparent thickness. We then experimentally
investigated the increase in sound absorption in the low-frequency range. For test samples with rice straws arranged both in the normal direction and in the oblique manner, the sound-absorption peak of the oblique incident sound-absorption coefficient in free space was shifted to the high-frequency
side compared with that of the normal incident sound-absorption coefficient and the sound-absorption curve became flat in the high-frequency range. We demonstrated that the use of an oblique arrangement of rice straws inside acoustic tubes and in free space can improve the sound absorption
in low-frequency range without increasing the apparent thickness of the material.",
}