A novel structural damage identification approach using damage-induced perturbation in longitudinal vibration

Structural damage identification approaches relying on structural vibration shapes (VSs) have been widely developed. Among the approaches, pseudo-force approach has attracted increasing attention during recent decade owing to fact that damage-induced is concentrated within region only and rapidly attenuates at undamaged locations. Transverse pseudo-forces (TPFs) flexural VSs used for identification. However, TPF inapplicable some structures governed mainly by tension not bending, such as cables in a cable-stayed bridge, because bending effects their vibrations are much smaller compared effects. In contrast, longitudinal can be useful identifying damages, although they more difficult measure than VSs. this study, new concept of axial (APF) formulated using perturbation vibration, which forms basis novel longitudinally vibrating structures. Unlike transverse proposed APF relies tension/compression. particular, index (DI) established indicate locate damage. The multiscale analysis integrated into DI enhance its robustness against environmental noise interference. A normalization strategy further deal with unknown material parameters practical scenarios. capability analytically verified bars two-sided notches. applicability experimentally validated notch an aluminum bar whose were acquired through non-contact measurement three-dimensional (3D) scanning laser vibrometer (SLV).