基于导波的飞机结构腐蚀损伤监测研究

Research on Corrosion Damage Monitoring of Aircraft Structure Based on Guided Wave

飞机结构腐蚀损伤会显著降低飞机结构的安全性能,危害飞行安全。提出一种基于导波的航空结构腐蚀损伤概率重建算法用于航空结构腐蚀损伤的在线监测。针对结构上真实的腐蚀损伤,采用频谱幅度差损伤因子表征Lamb波参考信号和监测信号的相关性,并作为损伤概率重建算法方法中的图像重建参数;根据损伤概率重建算法的成像结果,提出了一种融合损伤因子方法对腐蚀深度进行评估,同时采用超声检测方法测量结构上的腐蚀损伤与上述方法进行了对比。试验结果表明,该方法有效实现了结构腐蚀损伤的定位和腐蚀深度的评估。

The corrosion damage of aircraft structure can significantly reduce the safety performance of aircraft structure and endanger the flight safety.In this paper,an aircraft structure corrosion damage probability reconstruction algorithm based on guided wave is proposed to monitor the corrosion damage of aircraft structures.Targeted at structurally real corrosion damage,in this paper,the correlation between the Lamb wave reference signal and the monitoring signal is characterized by the spectrum amplitude difference damage index and used as the image reconstruction parameter in the reconstruction algorithm for probability inspection of damage(RAPID).According to the imaging results of the RAPID method,a fusion damage index method is proposed to evaluate the corrosion depth,and the structural corrosion damage measured by the ultrasonic C-scan system is compared with the above method.The experimental results show that the proposed method can effectively locate the corrosion damage and evaluate the corrosion depth.