Results 1 to 10 of about 13,963 (253)
Sound-Absorption Coefficient of Bark-Based Insulation Panels. [PDF]
Polymers (Basel), 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.
Tudor EM +5 more
europepmc +4 more sources
Results in EngineeringThis study proposes an underwater coating with sound absorption ability in the middle-to-low frequency range and establishes an acoustic theoretical model combining the equivalent medium theory and the transfer matrix method.
Nansha Gao +3 more
doaj +3 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
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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
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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 +2 more
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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 +5 more
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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 +5 more
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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 +2 more
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Optimization of Sound Absorption Performance of OGFC Asphalt Mixture Based onAcoustic Parameters [PDF]
Zhengzhou Daxue xuebao. Gongxue banIn the phenomenological model, the sound absorption coefficient of porous materials was used to explaintakes into account the energy dissipation generated by the propagation of sound waves in the void structure.
WU Wenliang, LI Chenyue, DAI Shenglin
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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
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