Results 81 to 90 of about 2,739,672 (219)
Ultrasonic propagation in gases at high temperatures [PDF]
, 1970 Ultrasonic pulse method /1 to 3 MHz/ measures both sound speed and absorption in monatomic and polyatomic gases in a temperature range of 300 to 20000 degrees K at atmospheric pressure.
Carey, C. +3 more
core +1 more source
Effects of fiber motion on the acoustic behavior of an anisotropic, flexible fibrous material [PDF]
The acoustic behavior of a flexible fibrous material was studied experimentally. The material consisted of cylindrically shaped fibers arranged in a batting with the fibers primarily aligned parallel to the face of the batting.
Dahl, Milo D. +2 more
core +1 more source
Effect of Perforation Size on Sound Absorption Characteristics of Membrane Absorber [PDF]
, 2018 This paper describes the analysis on the sound absorption characteristics of perforated membrane absorber. This study aimed to investigate the effect of perforation sizes and percentage of perforation areas on the membrane sound absorption characteristic.
Hamdan, Nur Izzah +4 more
core +1 more source
Propagation of sound from aircraft ground operations [PDF]
Atmospheric absorption effects on sound propagation losses during aircraft ground ...
Bishop, D. E., Franken, P. A.
core +1 more source
A data-driven two-microphone method for in-situ sound absorption measurements [PDF]
arXivThis work presents a data-driven approach to estimating the sound absorption coefficient of an infinite porous slab using a neural network and a two-microphone measurement on a finite porous sample. A 1D-convolutional network predicts the sound absorption coefficient from the complex-valued transfer function between the sound pressure measured at the ...
arxiv
Optimal Sound Absorbing Structures [PDF]
arXiv, 2016 Causal nature of the acoustic response, for any materials or structures, dictates an inequality that relates the absorption spectrum of the sample to its thickness. We present a general recipe for constructing sound-absorbing structures that can attain near-equality for the causal relation with very high absorption performance; such structures are ...
arxiv
Absorption of sound in air below 1000 cps [PDF]
Absorption of sound in air measured for varying conditions of pressure, temperature, and ...
Harris, C. M., Tempest, W.
core +1 more source
Sound Absorption in Porous Materials. [PDF]
, 2017 Porous materials have been the most commonly used materials to dissipate sound energy and reduce sound reflections. The popularity of these materials resides in their ability to efficiently absorb sound at mid and high frequencies using relatively thin ...
Cucharero Moya, Jose
core
Average Sound Absorption per Person at Octave Band Frequencies Between 125Hz And 4000Hz in an Enclosure [PDF]
, 2013 The audience constitutes the major sound absorbent materials in most church auditoria and, non-inclusion of the sound absorbed by the audience in the determination of the optimum reverberation time from the design stage accounts for the problem of poor ...
E., Agoyi, +3 more
core +1 more source
Influence of the Grain Orientation of Wood upon Its Sound Absorption Properties. [PDF]
Materials (Basel), 2023 Guiman MV +5 more
europepmc +1 more source