希尔伯特黄变换在调制超声激励-光纤光栅传感损伤检测中的应用

发布时间：2018-06-19 08:38

本文选题：非线性超声 + 调制超声激励　；参考：《传感技术学报》2017年02期

【摘要】：相比于线性超声技术,非线性超声技术在微小损伤检测中的优势已得到广泛的认可。采用调制超声激励法,并利用布拉格光纤光栅(FBG)取代压电片实现调制超声响应的传感,使得整个系统更容易实现分布式检测。以铝制平板为对象,研究了FBG对超声的传感特性,建立了一个振动超声激励-FBG传感系统。利用希尔伯特黄变换对缺陷导致的非线性现象进行了分析,证实其既是调幅信号也是调频信号,因此在今后损伤分析研究中需同时考虑损伤对幅值和频率的影响。
[Abstract]:Compared with linear ultrasonic technology, nonlinear ultrasonic technology has been widely recognized in the advantages of micro-damage detection. The modulated ultrasonic response sensing is realized by using the modulated ultrasonic excitation method and the FBG instead of the piezoelectric plate, which makes the whole system easier to realize the distributed detection. The ultrasonic sensing characteristics of FBG are studied with aluminum plate as the object. A vibration ultrasonic excited-FBG sensing system is established. The nonlinear phenomena caused by defects are analyzed by Hilbert-Huang transform, and it is proved that the nonlinear phenomena are both amplitude modulation and frequency modulation signals. Therefore, the influence of damage on amplitude and frequency should be considered simultaneously in damage analysis in the future.
【作者单位】：武汉理工大学机电工程学院;
【基金】：国家自然科学基金项目(51375358)
【分类号】：TB553

【相似文献】