基于希尔伯特黄变换的非接触式冲击损伤定位研究

Research on non-contact impact damage location based on HHT

摘要:

航空/航天器、汽车、轮船等工程设施在服役过程中受到其他物体的冲击时，造成的损伤会引起构件的失效甚至会造成灾难性事故，如何采取有效的措施监测和评定这类活性冲击损伤至关重要。为了实现实时、准确的定位工程结构中的冲击损伤，本文提出了一种基于扫描式激光多普勒测振仪（SLDV）的非接触式冲击损伤定位方法。将Hilbert-Huang Transform（HHT）变换应用于信号处理中，得出最佳响应频率谱，将分离出的IMF1用于幅值全加和幅值全乘的圆轨迹定位成像中，实验结果表明HHT方法可用于实现复合材料的非接触式冲击损伤定位中。

Abstract:

When an aircraft, spacecraft, automobile, ship, or other engineering facility is impacted by other objects during service, the damage caused by the component may cause a failure of the component or even a catastrophic accident. How to take effective measures to monitor and assess such active impact damage is essential. To locate impact damage precisely in real-time in an engineering structure, a non-contact impact damage location method based on scanning laser Doppler vibrometer (SLDV) was proposed in this paper. The Hilbert-Huang Transform (HHT) was applied to the signal processing to obtain the best response frequency spectrum. The separated IMF1 was used in the circular trajectory positioning imaging of amplitude total addition and amplitude multiplication. The experimental results indicate that HHT can be used to achieve non-contact impact damage localization of composite materials.