水中声波非线性相互作用的声吸收声研究

为研究声波非线性变参数相作用后的能量转移问题，本文利用谱分解方法对整倍频声波相互作用后的幅度解进行了理论研究和仿真分析。研究表明：高频声源级大于低频声源级，且高频声源级取定值时，频率比N越大，声吸收声效果越小。频率比N 3时，两列声波的初始相位关系对声吸收声的影响可忽略不计。高频泵源越强，高频对低频声的声吸收声效果越弱；相反，低频泵源越强，高频声波对低频声的声吸收声效果越强。非线性累积效应在间断距离处达到最强。

Sound absorption of sound under interaction among underwater nonlinear acoustic variable parameters

In order to investigate the energy transfer under interaction among nonlinear acoustic variable parameters,the spectrum decomposition was used to study and simulate amplitude resolution after interaction of intefer-times frequency waves.The results showed that when a high-frequency source level is greater than a low-frequency source level and the high-frequency source level is fixed,the sound absorption of sound decreases as the frequency ratio increases;when the frequency ratio is not less than 3,the sound absorption effects of sound caused by the initial phase relationship between two sound waves can be ignored;As a high-frequency pump source is stronger,the absorption effects of higher frequency sound on lower frequency sound become weaker;in contrast,as a low-frequency pump source is stronger,the absorption effects of higher frequency sound on lower frequency sound become stronger,the nonlinear cumulative effect is maximum at break distances.