Relation of sound absorption and shallow water modal attenuation to plane wave attenuation

Distance Characteristics of Sound Wave Attenuation in ER Fluids

Abstract Electrorheological fluids (ER fluid) as an electrically controllable acoustic medium has been proved by experimental studies. In this paper, the sound attenuation in ER fluid at different propagation distances was experimentally studied. The results show that sound attenuation of ER fluid could be adjusted by the particle concentration of ER fluid and the intensity of electric field. A...

Sound Speed and Attenuation in Multiphase Media

One research goal developed from conducted shallow water (SW) acoustic transmission experiments in sandy-silty areas [1] revealed a nonlinear power law frequency-dependent attenuation at lower frequencies ( ≤ 1 kHz ) consistent with results reviewed in [2-4] and the observations by the ONR-HEP program. The Biot Theory [5] predicts that the sandysediment frequency-dependent attenuation should be...

Temperature Dependence of Sound Attenuation in Aluminum

The object of this experiment was to measure the attenuation of sound waves in commercial aluminum as a function of temperature in the range between the temperature of boiling nitrogen (78*K) and room temperature (300'K). Several attenuation mechanisms have been known for some time; for instance, thermal loss mechanisms, which occur when a solid is compressed. The compressed parts become warmer...

Seismic Wave Attenuation in Carbonates

Fractional Wave Equations with Attenuation.

Fractional wave equations with attenuation have been proposed by Caputo [5], Szabo [27], Chen and Holm [7], and Kelly et al. [11]. These equations capture the power-law attenuation with frequency observed in many experimental settings when sound waves travel through inhomogeneous media. In particular, these models are useful for medical ultrasound. This paper develops stochastic solutions and w...