The propagation of acoustic waves and beams of high intensity in viscoelastic media containing a gas cavity is considered. The response of such medium to the external acoustic impact differs in various frequency-dependent effects and complex temporal dependence, in particular of resonance and relaxation type. The behavior of viscoelastic material in this medium is of a relaxation nature, carrying the memory of the impact in the previous moments of time. The dynamics of internal elements, inclusions and cavities can have a clearly resonant character. The transformation of time profiles and the transverse structure of the beams propagating in such environments with complex internal dynamics is Calculated.
47.55.dd Bubble dynamics
47.40.Nm Shock wave interactions and shock effects
43.30.+m Underwater sound
$^1$Department of General Nuclear Physics, Faculty of physics, Lomonosov Moscow State University
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