Results 81 to 90 of about 2,768,062 (267)
Application Progress of Resonance Sound Absorption Structure in Aero Engines
Hangkong gongcheng jinzhan, 2019 Resonance sound absorption structure is a sandwich structure composed of perforated panel, honeycomb and rigid backplane. This structure is widely used in aircraft engine nacelle and has achieved good noise reduction effect.
Ji Shuangying, Hao Wei, Liu Jie
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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.
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Quantitative Photoacoustic Imaging in the Acoustic Regime using SPIM
, 2017 While in standard photoacoustic imaging the propagation of sound waves is modeled by the standard wave equation, our approach is based on a generalized wave equation with variable sound speed and material density, respectively.
Beigl, Alexander +3 more
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Theoretical and Applied Mechanics Letters, 2016 We present a design method for calculating and optimizing sound absorption coefficient of multi-layered porous fibrous metals (PFM) in the low frequency range.
Wenjiong Chen +3 more
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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
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.
core
Acoustic properties of biodegradable composite micro-perforated panel (BC-MPP) made from kenaf fibre and polylactic acid (PLA) [PDF]
, 2018 This paper investigates the sound absorption of biodegradable composite micro-perforated panel (BC-MPP) made from kenaf fibre and biodegradable polymer known as polylactic acid (PLA). BC-MPP samples were made through conventional machining method such as
Che Din, Nazli +3 more
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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
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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Improved sound absorption with 3D-printed micro-perforated sandwich structures
Journal of Materials Research and TechnologyThe micro-perforated sandwich structure based on triply periodic minimal surfaces (TPMS) is a lightweight, high-strength and multi-functional structure, which integrates heat exchange, impact resistance, energy absorption, etc., and has been widely used ...
Peng-Fei Zhang +8 more
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