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Contact acoustic nonlinearity effect on the vibro-acoustic modulation of delaminated composite structures

机译：接触声学非线性效应对分层复合结构的振动声调节

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摘要

In recent years, Vibro-Acoustic Modulation (VAM) techniques for structural health monitoring -have received increasing attention. For such techniques, the sidebands and higher-order harmonics generated by double/single sinusoidal excitations are utilized to identify a series of damages. Currently, most VAM investigations are experimental, mainly involving signal processing, while few studies have paid attention to the mechanics of VAM generation. This paper presents a comprehensive investigation which studies the effects of Contact Acoustic Nonlinearity (CAN) on VAM for delaminated composite structures. The paper includes theoretical analysis, simulations, and experiments. Considering both a nonlinear contact constitutive model and the clapping/rubbing discontinuity, an approximate solution for nonlinear motional equation was established by using Fourier series expansion. A modified Greenwood-Williamson (GW) model for physical contact was implemented into the commercial finite element software ABAQUS by a UINTER subroutine, which described the contact behaviors between rough surfaces. The calculated signal responses from the delaminated composite plates were compared to experimental results. A good agreement was qualitatively and quantitatively achieved with acceptable error. Particularly, some specific features of higher-order sidebands existing in the experiment were identified. Results showed that the combined effect of the nonlinear contact constitutive model and the clapping/rubbing mechanism caused odd-even order differences. The asymmetry between the sidebands indicates the existence of amplitude and frequency modulations, which can be used to extract nonlinear damage indexes. These indexes are capable of characterizing the degree and range of damage.
机译：近年来，振动声调制（VAM）结构健康监测的技术 - 收到了不断的关注。对于这样的技术，利用双/单正弦激励产生的边带和高阶谐波来识别一系列损坏。目前，大多数VAM调查是实验性的，主要涉及信号处理，而几个研究已经注意了VAM生成的机制。本文介绍了全面调查，研究了接触声非线性（CAN）对分层复合结构的VAM的影响。本文包括理论分析，仿真和实验。考虑到非线性触点本构体型模型和鼓声/摩擦不连续性，通过使用傅里叶串联扩展建立了非线性运动方程的近似解。用于物理触点的修改的Greenwood-Williamson（GW）模型由UINTER子程序实施到商业有限元软件中，其描述了粗糙表面之间的接触行为。将来自分层复合板的计算的信号响应与实验结果进行比较。具有良好的一致性和定量达到可接受的错误。特别地，鉴定了实验中存在的高阶边带的一些特定特征。结果表明，非线性触点本构模型的组合效应和拍手/摩擦机制引起了奇数甚至的顺序差异。边带之间的不对称表示存在幅度和频率调制，其可用于提取非线性损伤索引。这些指标能够表征损坏的程度和范围。

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