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Acoustics- The definitive study of acoustic absorption measurement

, 2005
Soon Heng Francis Tan, Soon Heng Francis Tan   +1 more
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Acoustic absorptivity of direct acoustic rate feedback control

The Journal of the Acoustical Society of America, 1995
The fixed-gain feedback methods often provide the only means of limiting transient noise and excessive sound pressures due to unmeasurable, incoherent disturbances. The use of direct acoustic rate feedback (DARFB) to control an enclosure’s reverberant energy has the benefit over other feedback methods of larger stability margins and improved stability ...
Daniel G. Cole, William R. Saunders
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On acoustic absorption in tissue.

The Journal of the Acoustical Society of America, 2011
This work extends the relaxation theory of sound absorption to the case of continuous distribution of relaxation times. Such an extension is needed when the absorption mechanisms are not confined to viscosity and heat conduction, but are due mainly to the excitation of a large number of internal molecular degrees of freedom.
Gregory Vilensky, Nader Saffari, Gail ter Haar   +2 more
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Acoustical Absorption of Porous Pavement

Transportation Research Record: Journal of the Transportation Research Board, 2008
Acoustical absorption coefficients of more than 140 pavement cores were obtained by the impedance tube method with two microphones and cross-spectral analyses. The effectiveness of the impedance tube in predicting noise reduction for different mixes was evaluated by comparing the correlations between onboard sound intensity levels and absorption ...
James T. Nelson, Erwin Kohler, Aybike Öngel, Bruce Rymer   +3 more
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Foam acoustic absorption member

The Journal of the Acoustical Society of America, 1988
A foam acoustic absorption member having a stabilizing layer with perforations and, in order to obtain a simple, stable structural shape of homogeneous resistance to flow, the stabilizing layer (2) is a wide-side wall of a hollow body (K) which wall is pressed, under thermal deformation, against the foam layer (1), the openings in said hollow body ...
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Acoustic Impedance and Sound Absorption

The Journal of the Acoustical Society of America, 1940
Theoretical curves for acoustic impedance vs. frequency, obtained by solving the equation for wave motion within the material, are compared with recently measured values of the impedance of various sound absorbing materials. The satisfactory agreement in most cases measured indicates that that for homogeneous materials the effective values of flow ...
Philip M. Morse, Richard H. Bolt, Richard L. Brown   +2 more
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Phononic glass: A robust acoustic-absorption material

The Journal of the Acoustical Society of America, 2012
In order to achieve strong wide band acoustic absorption under high hydrostatic pressure, an interpenetrating network structure is introduced into the locally resonant phononic crystal to fabricate a type of phononic composite material called “phononic glass.” Underwater acoustic absorption coefficient measurements show that the material owns high ...
Heng, Jiang, Yuren, Wang
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How Can Architectural Acoustics Reflect Levels of Stress and Relaxation in Indoor Environments? An EEG-Based Experimental Study

OBM Neurobiology
The acoustic design of indoor environments encompassing spatial configuration, material properties, and sound absorption significantly influences auditory perception and psychological well-being.
Navid Khaleghimoghaddam, Sara Arzhangi
semanticscholar   +1 more source

Acoustic absorption properties of materials

Construction and Building Materials, 1988
Abstract The sound absorption characteristics of some 30 different but easily available sound absorbing materials have been studied previously. Presented here in brief are a selection of these materials, their description, methodology used and results obtained.
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Effects of Geometrical Acoustics Model Simplification on Binaural Reverberation

IEEE Transactions on Audio, Speech, and Language Processing
Virtual reverberation rendering typically requires detailed information about room geometry and surface acoustic characteristics. While comprehensive modeling approaches can account for all aspects of an acoustic environment, they often incur high ...
Vincent Martin, Isaac Engel, L. Picinali
semanticscholar   +1 more source