Results 1 to 10 of about 118,824 (293)

Sound-Absorption Coefficient of Bark-Based Insulation Panels [PDF]

Polymers, 2020
The objective of this study was to investigate the sound absorption coefficient of bark-based insulation panels made of softwood barks Spruce (Picea abies (L.) H. Karst.) and Larch (Larix decidua Mill.) by means of impedance tube, with a frequency range between 125 and 4000 Hz.
Eugenia Mariana Tudor, Anna Dettendorfer, Günther Kain, Marius Catalin Barbu, Roman Réh, Ľuboš Krišťák   +5 more
europepmc   +5 more sources

Sound Wave Absorption Coefficient and Sound Velocity in Thermally Modified Wood

Applied Sciences, 2023
The present work analyses the absorption coefficient of sound waves and the speed of sound propagation in thermally modified wood. The high resistance to weathering, fungi, and better dimensional stability, and therefore the broad physical properties of ...
Przemysław Mania, Artur Flach, Marta Pilarska   +2 more
doaj   +2 more sources

Broadening sound absorption coefficient with hybrid resonances [PDF]

Applied Acoustics, 2020
Abstract In the last years, a great research effort has been focused on the noise mitigation at low frequencies. Membrane-type acoustic metamaterials (AMM) are one of the most promising solutions to meet the growing demand for low frequency sound absorbers.
Bucciarelli, Fabrizio, Meo, Michele
openaire   +1 more source

Investigation of the sound absorption properties of gypsum particleboard produced with kenaf stalks and nano clay [PDF]

تحقیقات علوم چوب و کاغذ ایران, 2014
In this study sound absorption coefficient and hardness of gypsum particleboard produced with kenaf stalk and nano clay were investigated. Variables in this study were weight ratio of kenaf stalks to poplar wood in three levels (40, 50 and 60 %) and nano
Hossein Rangavar, Mohammad hassan Payan
doaj   +1 more source

Prediction method of sound absorption properties of porous materials by probabilistic homogenization method using perturbation method

Nihon Kikai Gakkai ronbunshu, 2021
Quantitative evaluation of uncertainty in acoustic properties is an essential issue to improve product quality. The acoustic properties of porous materials, such as sound absorption coefficient, are affected by variations in microstructure and material ...
Yosuke KOMATSU, Takashi YAMAMOTO, Daiji KATSURA, Keisuke YAMAKAWA, Hideyuki YUKAWA, Masayoshi TATENO   +5 more
doaj   +1 more source

Sound Absorption and Diffusion by 2D Arrays of Helmholtz Resonators

Applied Sciences, 2020
We report a theoretical and experimental study of an array of Helmholtz resonators optimized to achieve both efficient sound absorption and diffusion. The analysis starts with a simplified 1D model where the plane wave approximation is used to design an ...
Iván Herrero-Durá, Alejandro Cebrecos, Rubén Picó, Vicente Romero-García, Luis Miguel García-Raffi, Víctor José Sánchez-Morcillo   +5 more
doaj   +1 more source

Sound absorption of lightweight brick containing expanded polystyrene beads and palm oil fuel ash [PDF]

, 2020
Bricks are considered as important and strongest materials being used over the years. Commonly, bricks are made of clay mineral and usually used in construction of building wall. The purpose of this study is to assess the effectiveness of palm oil fuel
Abdul Hamid, N A, Abdul Roni, N, Adnan1, S H, Alisibramulisi, A, Jamellodin, Z, Kamarulzaman, N A, Mohd Sari, K A, Mohd Yassin, N I, Osman, M H, Wahee Anuar, M N A   +9 more
core   +1 more source

Fiber Weight Fraction Effect to Acoustic Properties of RHDPE Cantula Composite

Mekanika, 2017
In this study, composites made from recycled HDPE and Cantula fiber have been done and the absorption coefficient have been measured. Composites rHDPE-Cantula were made using hot press for approximately 60 minutes with 170oC temperature while pressure ...
Muhammad Taufik Burhany Hendrowarsito, Wijang Wisnu Raharjo, Dwi Aries Himawanto   +2 more
doaj   +1 more source

A numerical study of a method for measuring the effective in situ sound absorption coefficient [PDF]

, 2012
The accuracy of a method [Wijnant et al., “Development and applica- tion of a new method for the in-situ measurement of sound absorption”, ISMA 31, Leuven, Belgium (2010).], for measurement of the effective area-averaged in situ sound absorption ...
André de Boer, de Bree H.-E., Erwin R. Kuipers, Fahy F., Ysbrand H. Wijnant   +4 more
core   +3 more sources

Akytojo betono garso absorbcijos tyrimai/Porous concrete sound absorption investigation

Journal of Civil Engineering and Management, 1996
Low-density porous concrete can be used as a sound absorbing material. This paper generalizes porous concrete sound absorption investigations. Porous concrete relative wave resistance modulus is longer than air wave resistance W=1 and that is why this
Antanas Laukaitis, Vytautas Lasauskas
doaj   +1 more source