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Innovative Regression Model for Frequency-Dependent Acoustic Source Strength in the Aquatic Environment: Bridging Scientific Insight and Practical Applications. [PDF]
Sensors (Basel)Greenberg M, Kushnir U, Frid V.
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Inhomogeneous absorption and geometric acoustics
Journal of the Acoustical Society of America, 1998The conventional formulation of geometric acoustics in the presence of inhomogeneous (spatially varying) absorption is examined. This formulation is found to fail under conditions of multipath propagation, because interference between ray paths is not taken into account when the absorptive losses are calculated.
F D Tappert, Tappert F D
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On acoustic absorption in tissue.
The Journal of the Acoustical Society of America, 2011This 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 +2 more
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Subwavelength acoustic metamaterial with tunable acoustic absorption
The Journal of the Acoustical Society of America, 2015We present numerical simulations and experimental measurements for ultrasonic transmission through a subwavelength metamaterial consisting of an array of hollow cylinders embedded in a soft elastic matrix. The mechanical properties of the matrix, the lattice constant, and the size of the cylinders are optimized in order to maximize sound absorption in ...
Nicolas Viard +3 more
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Acoustical Absorption of Porous Pavement
Transportation Research Record: Journal of the Transportation Research Board, 2008Acoustical 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 +3 more
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Scattering and Absorption by an Acoustic Strip
The Journal of the Acoustical Society of America, 1951A method for treating the scattering and absorption of sound in the presence of non-uniform boundary conditions is applied to the case of an infinite strip of material (of given width) placed on an infinite, otherwise hard, wall. The strip is assumed to be characterized by a normal acoustic impedance that may possess a resistive component.
Alfred Levitas, Melvin Lax
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Acoustic Impedance and Sound Absorption
The Journal of the Acoustical Society of America, 1940Theoretical 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 +2 more
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Acoustic absorptivity of direct acoustic rate feedback control
The Journal of the Acoustical Society of America, 1995The 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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Acoustics- The definitive study of acoustic absorption measurement [PDF]
The Team’s approach into the Definitive Study of Acoustic Absorption Measurement involved three methods; the Acoustic Impedance Tube, the Large Reverberation Room and the Small Reverberation Chamber. The particular interest and primary focus of this study is to obtain the sound absorption coefficient, α of the various acoustic materials that were ...
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