基于Poincare截面突变特性的管道小缺陷识别与评估

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (2) : 161-168.

论文

成梦菲1 张伟伟王晶2 闫晓鹏1 马宏伟3

作者信息 +

Small defect identification and evaluation in a pipe based on Poincare cross-section sudden changes

CHENG Mengfei1，ZHANG Weiwei2，WANG Jing2，YAN Xiaopeng1，MA Hongwei3

Author information +

文章历史 +

摘要

利用混沌系统的参数敏感性与噪声免疫性，本文提出了一种以Poincare截面为混沌判据的弱导波信号检测系统，实现了管道小缺陷的识别与评估。首先，结合分岔分析与Poincare截面获取混沌阈值，完成了检测系统的参数设定。然后，通过仿真分析验证了以Poincare截面为混沌判据的检测系统的噪声免疫能力与参数敏感性。最后，开展了超声导波检测管道中小缺陷的实验研究，并将实测信号作为驱动力的扰动项输入到检测系统中，通过Poincare截面的突变有效地识别出小缺陷引起弱导波信号。为了对缺陷进行定位和评估，一种快速的二分法被用来进行缺陷定位，同时，通过在Poincare截面上构造胞空间，计算出Poincare截面上相点所占胞元数定义为损伤指标，该损伤指标在一定范围内与损伤程度具有简单的线性关系，可为缺陷大小评估提供参考。

Abstract

In this paper, a weak ultrasonic guided wave identification is proposed based on the Poincare section of the Duffing chaotic system to realize the identification and evaluation of small pipeline defects. This method utilizes the sensitivity of the Duffing chaotic system to weak signals of the same frequency. First, the critical state of the Duffing chaotic system's transition from periodic state to chaos is determined through bifurcation analysis. And the critical state is set as the inspection system; Then, the ultrasonic guided waves-based NDT are carried out in a pipeline, and the measured signal is added to the inspection system as a disturbance item of the driving force. The study show that the Poincare cross section of the system is a point, indicating that the system maintains a periodic state when there is only a noise signal in the detection signal but no guided wave signal; but the Poincare cross section of the system will suddenly change to a certain Hierarchical point collection when the detection signal contains a weak guided wave signal. This feature can be used to identify weak guided wave signals and to identify small defects in the pipeline. In order to quantitatively analyze the defects, the cell space on the Poincare section is constructed and the number of cells occupied by the phase points is counted and defined as the damage index, which is defined as damage index. Experiments studies show that there is a simple linear relationship between the damage index and the defect size.

导出引用

成梦菲1 张伟伟王晶2 闫晓鹏1 马宏伟3. 基于Poincare截面突变特性的管道小缺陷识别与评估[J]. 振动与冲击, 2022, 41(2): 161-168

CHENG Mengfei1，ZHANG Weiwei2，WANG Jing2，YAN Xiaopeng1，MA Hongwei3. Small defect identification and evaluation in a pipe based on Poincare cross-section sudden changes[J]. Journal of Vibration and Shock, 2022, 41(2): 161-168

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