The theoretical study by the perturbation method of the acoustic effects at the degenerate parametric interaction of a strong high-frequency and a weak low-frequency longitudinal elastic waves in microinhomogeneous solids with a quadratically-bimodular nonlinearity is presented. The amplitude dependences for the following nonlinear effects are revealed and analyzed: generation of second and fourth harmonics of the strong high-frequency wave and changes in the amplitude (amplification or weakening) of the weak low-frequency wave under the action of the strong high-frequency wave. It is noted that the experimental study of these effects can be used to determine nonlinear parameters of such solids.

提出了在具有二次双模非线性的微非均匀固体中强高频和弱低频纵向弹性波的简并参数相互作用的声学效应的微扰方法的理论研究。揭示并分析了以下非线性效应的幅度依赖性：强高频波的二次和四次谐波的产生以及强高频波作用下弱低频波的幅度变化（放大或减弱）。 -频率波。值得注意的是，这些效应的实验研究可用于确定此类固体的非线性参数。