In this paper, we investigate the nonlinear sound absorption of coiling-up space under high amplitude acoustic excitation with analytical method based on JCAL model, numerical simulation method based on finite element, and experimental methods based on impedance tube. The analytical model is established by analogy with porous material. The high incident sound pressure level (ISPL) causes acoustic vortices to arise at the inner corners of the coiling-up space, converting part of the acoustic energy into the kinetic energy of vortices, which is ultimately dissipated by thermoviscous loss. The nonlinear acoustic effects increase the real part of normalized acoustic impedance, which is more dramatic as the ISPL increases. The results of the parametric analysis demonstrate that the effect of ISPL on the absorption coefficient at peak frequency decreases as the total equivalent length increases.

中文翻译：

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高振幅声激励下卷绕空间的非线性吸声

本文采用基于JCAL模型的解析方法、基于有限元的数值模拟方法和基于阻抗管的实验方法研究了高振幅声激励下卷绕空间的非线性吸声问题。类比多孔材料建立了分析模型。高入射声压级（ISPL）导致卷绕空间内角产生声涡流，将部分声能转化为涡流动能，最终通过热粘性损失而消散。非线性声学效应会增加归一化声阻抗的实部，随着 ISPL 的增加，这种影响会更加显着。参数分析结果表明，ISPL对峰值频率吸收系数的影响随着总等效长度的增加而减小。