基于杜芬混沌振子的磁致伸缩导波信号识别

Identification of Magnetostrictive Guided Wave Signal Based on Duffing Chaotic Oscillators

在无损检测中,磁致伸缩导波技术已得到普遍应用。由于导波在波导中传播时会发生频散,使得信号能量在空间中散播,增加了检测小缺陷的难度。根据导波信号检测的特点,从系统输入输出特性出发,提出了基于杜芬混沌振子的导波信号识别方法。在考虑电磁脉冲的影响下,把钢绞线实验导波信号输入杜芬混沌系统,发现可以通过系统由大尺度周期状态到混沌状态的改变来辨识出小缺陷信号,为提高导波检测精度提供了一种方法。

The technology of magnetostrictive generated guided waves has been applied to nondestructive testing(NDT)widely.It is difficult to detect the small flaw signal because of guided wave s dispersion and multimode.According to these characters of the signal,the method based on Duffing chaotic oscillator was presented to detect flaw signal.First,the Duffing chaotic oscillator was set into the periodic state.Then,the signal without pulsed electromagnetic was introduced into Duffing system,and the system was into ...