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Article
Parameters of Acoustic Inhomogeneity for Nondestroductive Estimation of the Influence of Manufacturing Technology and Operational Damage on the Structure of Metal
An acoustic method for nondestructive evaluation of variations in the metal structure caused by violations in manufacturing technology or by accumulation of damage during operation has been proposed. The metho...
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Article
Self-Similar Acoustic Waves in the Media with a Power-Law Hysteresis Nonlinearity
We present the results of the studies of propagation of longitudinal acoustic waves in the media with a power-law hysteresis nonlinearity. Exact analytical solutions for the self-similar periodic waves propaga...
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Article
Acoustic Waves in Media with Quadratically Bimodular Nonlinearity and Linear Dissipation
We study, both theoretically and numerically, propagation of the longitudinal elastic waves in the media with quadratically bimodular nonlinearity and viscous dissipation. Exact analytical solutions for simple...
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Article
The Wave Processes in Micro-Inhomogeneous Media with Different-Modulus Nonlinearity and Relaxation
We present the results of analytical and numerical studies of propagation of longitudinal acoustic waves in micro-inhomogeneous media with different-modulus nonlinearity and relaxation. The solutions for evolu...
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Article
Evolution of Acoustic Waves in Homogeneous Media with Different-Modulus Nonlinearity and Relaxation
We present the results of analytical and numerical studies of propagation and evolution of the initially harmonic acoustic waves in homogeneous media with different-modulus nonlinearity and relaxation. The sol...
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Article
Self-Similar Acoustic Waves in Homogeneous Media with Different-Modulus Nonlinearity and Relaxation
We present the results of studying theoretically of propagation of plane longitudinal acoustic waves in homogeneous media with different-modulus elastic nonlinearity and relaxation. Exact analytical relations ...
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Article
Amplitude modulation of sound by sound in water-saturated river sand
We present a description and the results of a laboratory experiment on observing amplitude modulation of a weak continuous high-frequency wave under the action of a sequence of strong low-frequency pulses in a...
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Article
Self-action of ultrasonic pulses in a marble rod
The nonlinear effects due to the self-action of finite-amplitude ultrasonic pulses (limitation of both amplitude and carrier phase delay) propagating in a marble rod are studied experimentally and theoreticall...
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Article
Propagation of weak ultrasonic pulses in an intense low-frequency wave field in a granite resonator
Results of an experimental study of nonlinear attenuation and carrier frequency phase delay of weak ultrasonic pulses under the effect of an intense low-frequency wave in a bar resonator made from Karelian gra...
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Article
Self-action of a low-frequency acoustic wave and generation of the second harmonic in dry and water-saturated river sand
The amplitude-phase effects of self-action and generation of the second harmonic are observed for a low-frequency longitudinal acoustic wave propagating in dry and water-saturated (wet) river sand under a stat...
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Article
Self-action of seismic acoustic waves in the moist sandy soil
The effect of phase self-action of the longitudinal seismic acoustic wave observed in moist sandy soil is studied theoretically in framework of the phenomenological equation of state.
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Article
Amplitude dependent internal friction and generation of harmonics in granite resonator
The results of experimental and theoretical studies of low-frequency effects of amplitude dependent internal friction (nonlinear losses and resonance frequency shift) and generation of second and third harmoni...
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Article
Propagation of unipolar strain pulses in media with hysteretic nonlinearity
A theoretical study of the propagation of unipolar strain pulses in a solid medium with an arbitrary power-law hysteretic nonlinearity is carried out. Exact analytical expressions are derived for describing th...
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Article
Acoustic nonlinearity of water-like materials with partially liquid-filled capillaries
A theoretical study of elastic nonlinearity is carried out for a porous water-like material containing a set of parallel cylindrical cavities (capillaries) partially filled with an ideal incompressible liquid.
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Article
Experimental study of nonlinear acoustical effects in limestone
Results of an experimental and theoretical study of nonlinear acoustic effects (amplitude-dependent loss, resonance frequency shift, second and third harmonic generation, and sound by sound dam**) in a limes...
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Article
Evolution of acoustic waves in microinhomogeneous media with quadratic elastic nonlinearity and relaxation
A nonlinear wave equation for the velocity “relaxator” is derived in the framework of the rheological model and the corresponding equation of state of a microinhomogeneous medium containing viscoelastic defect...
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Article
Simulation of the dynamic hystereses in microinhomogeneous media characterized by imperfect elasticity and relaxation
Results of numerical simulations and a comparative graphical analysis are presented for two basic hysteretic models (hysteresis of friction and breakaway hysteresis) of microinhomogeneous media characterized b...
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Article
Self-demodulation of acoustic pulses in partially water-saturated river sand
Laboratory experiments on self-demodulation of high-frequency acoustic pulses in partially water-saturated river sand are reported. Based on experimentally revealed dependences of demodulated pulse parameters ...
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Article
Wave processes in microinhomogeneous elastic media with hysteretic nonlinearity and relaxation
The nonlinear propagation of an initially harmonic acoustic wave in a microinhomogeneous medium containing defects with quadratic hysteretic nonlinearity and relaxation is studied by the perturbation method. T...
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Article
Experimental study of the effects of amplitude-dependent internal friction in a sandstone bar resonator
Results of an experimental study of the effects of amplitude-dependent internal friction (nonlinear loss, resonance frequency shift, and sound-by-sound dam**) in an acoustic bar resonator made of sandstone a...
