Results 61 to 70 of about 2,739,672 (219)
Hybrid ultrathin metasurface for broadband sound absorption [PDF]
Appl. Phys. Lett. 124, 151702 (2024)To this day, achieving broadband low-frequency sound absorption remains a challenge even with the possibilities promised by the advent of metamaterials and metasurfaces, especially when size and structural restrictions exist. Solving this engineering challenge relies on stringent impedance matching and coupling of the multiple independent local ...
arxiv +1 more source
Experimental demonstration of the absorption of sound by sound in water [PDF]
The Journal of the Acoustical Society of America, 1975 Intense low-frequency sound can severely attenuate sound of higher frequencies via spectral redistribution. On the other hand, intense high-frequency sound does not appreciably alter a lower-frequency sound field. An experiment is described wherein a 68-kHz underwater sound beam was made to propagate collinearly with a 244-kHz beam, demonstrating the ...
Mark B. Moffett +2 more
openaire +2 more sources
Investigation On The Role of Cavity and Slit of Cavity Resonators to Sound Absorption Behavior [PDF]
, 2011 Slit resonator and also perforated resonator are few kind of room interior finishing. They act as sound absorbers. Gen-erally, they are constructed of at least three basic types of absorbers, such as porous, membrane and cavity compo-nents.These types of
Kristanto, Luciana, Susilo, Nugroho
core
Evaluating the bonding condition of NASA spray on foam insulation using audio frequency sound absorption measurements [PDF]
, 2005 The bonding condition of the spray on foam insulation (SOFI) used to insulate the external tank of the NASA space shuttle can be found by using the audio frequency sound absorption coefficient.
Thompson, Todd Alan
core +3 more sources
Absorption by sound-absorbent spheres [PDF]
Journal of Research of the National Bureau of Standards, 1949 The absorption of a plane wave of sound by a sphere is computed. The calculations are based on the assumption that the complex ratio of sound pressure at a point on the sphere's surface to the normal component of particle velocity is a constant independent of the direction of incidence (“normal impedance assumption”).
Peter Chrzanowski, Richard K. Cook
openaire +2 more sources
Tone-burst technique measures high-intensity sound absorption [PDF]
, 1971 Tone-burst technique, in which narrow-bandwidth, short-duration sonic pulse is propagated down a standing-wave tube, measures sound absorbing capacity of materials used in jet engine noise abatement. Technique eliminates effects of tube losses and yields
Powell, J. G., Van Houten, J. J.
core +1 more source
Sound Absorption in Replicated Aluminum Foam [PDF]
arXiv, 2018 Sound absorption is an important technological task in machine-building and civil engineering. Porous materials are traditionally used for these purposes, as they are neither ignitable nor hygroscopic and thus suitable for noise oppression, first of all in means of transportation. Absorption of acoustic oscillation energy in porous metals occurs mainly
arxiv
Universal sound absorption in low-temperature glasses [PDF]
, 2003 Phenomenologically assuming a sharp decrease of shear relaxation time for large wavevector $k>k_\xi$ density modes (where $k_\xi$ is of order of inverse of several interatomic distances $a$), I develop a general elasto-hydrodynamic theory describing the low-energy excitations of glassy and amorphous solids, which are responsible for anomalous specific ...
arxiv +1 more source
PENGARUH FRAKSI BERAT SERAT TERHADAP SIFAT AKUSTIK KOMPOSIT rHDPE-CANTULA [PDF]
, 2016 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 ...
H, M. TAUFIK BURHANY.
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A microscopic description of sound absorption in the atmosphere [PDF]
The various mechanisms which contribute to sound absorption in the atmosphere are identified and a technique for computing the contribution from each is presented.
Bass, H. E.
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