期刊
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
卷 163, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2021.108161
关键词
Composite structures; Structural health monitoring; Vibro-acoustic modulation; Contact acoustic nonlinearity; Amplitude modulation; Frequency modulation
资金
- National Natural Science Foundation of China [52078362]
- Hitachi Construction Machinery Co. Ltd. (Japan) as a part of a project on high strength steel fatigue (HSSF) characteristics [1330-239-0009]
This paper investigates the effects of Contact Acoustic Nonlinearity (CAN) on Vibro-Acoustic Modulation (VAM) for delaminated composite structures. The study includes theoretical analysis, simulations, and experiments, establishing an approximate solution for the nonlinear motional equation and implementing a modified Greenwood-Williamson (GW) model for physical contact. The results show promising potential for extracting nonlinear damage indexes and characterizing the degree and range of damage through the asymmetry of sidebands.
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据