摘要
导波在杆中多模态及频散特性对研究工作带来一定困难,然而利用时频分析可以有效地分析杆中多个模态。本文采用短时傅里叶变换对杆中导波进行了时频分析,时频分析结果与自由杆群速度频散曲线相吻合。表明,时频分析可作为导波在杆中传播特性分析的有力工具。
The multi-modes and dispersive effect of ultrasonic guided wave leads to difficulty of research for guided waves in rod. However, the modes in rod can be distinguished by time-frequency analysis. This paper analyze the modes in rod by short-time fourier transform. The results of time-frequency analysis are consistent with the group velocity dispersion curve. This indicates that time-frequency analysis is a available method for study on propagation characteristic of ultrasonic guided waves in rod.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2006年第z2期1316-1317,1325,共3页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金项目(10572009)
北京市自然科学基金项目(4052008)
北京市教委资助项目(4KM200410005003)
关键词
超声导波
杆
时频分析
传播特性
guided wave rod time-frequency analysis propagation characteristic
