Research on active and passive monitoring fusion for integrated lamb wave structural health monitoring

Abstract

Lamb wave based active and passive monitoring technologies are both hot points in structural health monitoring (SHM). However, active and passive monitoring methods were usually worked independently. The interaction and complementarity between Lamb wave active and passive monitoring techniques was analyzed. According to the advantages and disadvantages of active and passive monitoring methods, the active and passive cooperative working mechanism was proposed which combined the active and passive monitoring approaches. In the new method, active scanning and monitoring was set to be trigged by passive acoustic emission event, and the scanning interval could be greatly extended to save the energy consumption and improving monitoring efficiency as the evolution of damages caused by service and external erosion were usually very long. Meanwhile, the results and diagnosis information of active and passive monitoring method could be fused to improve the monitoring accuracy. In addition, the hardware implementation and software frame of the new integrated system were given. The experimental validation showed that the new approach combined the advantages of active and passive monitoring methods, and improved the damage monitoring efficiency and accuracy.