基于morlet小波与模态分析的突发型声发射源定位研究
发布时间：2018-12-30 11:23
【摘要】：在建立基于声发射技术的裂纹产生与拓展检测系统的基础上。以薄钢板为实验对象,研究了Lamb波在薄板中传播的频散及多模态特性,并结合morlet小波时频联合分析方法,提出了一种针对声发射信号在薄板中传播时产生的不同模态进行识别的方法。通过提取不同模态波到达同一传感器的时间差并依据不同模态波对应的波速实现对出现裂纹的位置进行定位。经过实验研究表明,运用该方法不仅能准确地识别A0、S0模态波并实现对声发射源进行精确定位。
[Abstract]:Based on acoustic emission technology, the crack generation and expansion detection system is established. The dispersion and multimodal characteristics of Lamb waves propagating in thin plates are studied, and the morlet wavelet time-frequency joint analysis method is combined. This paper presents a method for identifying different modes of acoustic emission signals propagating in thin plates. By extracting the time difference between different mode waves to the same sensor and according to the wave velocity corresponding to different mode waves, the location of the crack is located. The experimental results show that the proposed method can not only accurately identify the A0 / S0 mode waves but also accurately locate the acoustic emission sources.
【作者单位】： 内蒙古科技大学机械工程学院;
【基金】：国家自然科学基金项目(51565047) 内蒙古自治区自然科学基金项目(2015BS0511) 内蒙古自治区高等学校科学研究项目(NJZY154)
【分类号】：TG142.15
，
本文编号：2395519
[Abstract]:Based on acoustic emission technology, the crack generation and expansion detection system is established. The dispersion and multimodal characteristics of Lamb waves propagating in thin plates are studied, and the morlet wavelet time-frequency joint analysis method is combined. This paper presents a method for identifying different modes of acoustic emission signals propagating in thin plates. By extracting the time difference between different mode waves to the same sensor and according to the wave velocity corresponding to different mode waves, the location of the crack is located. The experimental results show that the proposed method can not only accurately identify the A0 / S0 mode waves but also accurately locate the acoustic emission sources.
【作者单位】： 内蒙古科技大学机械工程学院;
【基金】：国家自然科学基金项目(51565047) 内蒙古自治区自然科学基金项目(2015BS0511) 内蒙古自治区高等学校科学研究项目(NJZY154)
【分类号】：TG142.15
，
本文编号：2395519
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