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An Intense Wave in Defective Media Containing Both Quadratic and Modular Nonlinearities: Shock Waves, Harmonics, and Nondestructive Testing

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Abstract

The observed nonclassical power-law dependence of the amplitude of the second harmonic wave on the amplitude of a harmonic pump wave is explained as a phenomenon associated with two types of nonlinearity in a structurally inhomogeneous medium. An approach to solving the inverse problem of determining the nonlinearity parameters and the exponent in the above-mentioned dependence is demonstrated. To describe the effects of strongly pronounced nonlinearity, equations containing a double nonlinearity and generalizing the Hopf and Burgers equations are proposed. The possibility of their exact linearization is demonstrated. The profiles, spectral composition, and average wave intensity in such doubly nonlinear media are calculated. The shape of the shock front is found, and its width is estimated. The wave energy losses that depend on both nonlinearity parameters—quadratic and modular—are calculated.

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Correspondence to O. V. Rudenko.

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Original Russian Text © A.L. Gray, O.V. Rudenko, 2018, published in Akusticheskii Zhurnal, 2018, Vol. 64, No. 4, pp. 411–416.

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Gray, A.L., Rudenko, O.V. An Intense Wave in Defective Media Containing Both Quadratic and Modular Nonlinearities: Shock Waves, Harmonics, and Nondestructive Testing. Acoust. Phys. 64, 402–407 (2018). https://doi.org/10.1134/S1063771018040048

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  • DOI: https://doi.org/10.1134/S1063771018040048

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