中国舰船研究2024，Vol.19Issue(6)：237-247,11.DOI:10.19693/j.issn.1673-3185.03450
复合异质结构声发射信号传播特性研究
Investigation of propagation characteristics of acoustic emission waves in composite heterogeneous structures
魏羲 1刘贤玉 2陈力 2赵治民 3陈念众3
作者信息
- 1. 中石化胜利工程公司 钻井工艺研究院,山东 东营 257017
- 2. 中海石油(中国)有限公司湛江分公司工程技术作业中心,广东 湛江 524057
- 3. 天津大学 建筑工程学院,天津 300350
- 折叠
摘要
Abstract
[Objective]This paper aims to investigates the impacts of acoustic emission(AE)signals on the propagation characteristics of composite hetero-structures.[Methods]First,the calculation procedure of the dispersion curves is developed on the basis of the semi-analytical finite element method in order to calculate the group velocity dispersion curves of AE waves in composite panels.Next,ABAQUS is used to establish a finite element model and analyze the dispersion and attenuation characteristics of AE signals in the composite structure.Finally,the time-frequency characteristics and mode conversion of AE signals in a T-section com-posite hetero-structure are analyzed in combination with wavelet transform and modal acoustic emission the-ory.[Results]The attenuation of AE signals is related to the propagation distance and direction of signals,in which a signal is significantly attenuated when passing through the hetero-structure interface.The interac-tion between AE signals and the hetero-structure will produce complex propagation phenomena including T-shaped transformation and modal conversion.The signal strength of the reflected signal is strongest in the T-shaped transformation of the AE signal,and the signal strengths of the transmitted signals across the structure and the transmitted signals through the 90° corner of the structure are comparable.[Conclusion]This paper quantifies the scattering characteristics of AE signals using reflection and transmission coefficients,thereby providing theoretical references for the application of AE technology in the health monitoring of marine struc-tures.关键词
复合结构/声发射/声波传播/小波变换/模态转换/结构健康监测Key words
composite structures/acoustic emissions/acoustic wave propagation/wavelet transforms/modal conversion/structural health monitoring分类
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魏羲,刘贤玉,陈力,赵治民,陈念众..复合异质结构声发射信号传播特性研究[J].中国舰船研究,2024,19(6):237-247,11.
