Assessment of structural damage from natural frequency measurements

Acoustic Emission and Modal Frequency Variation in Concrete Specimens under Four-Point Bending

“…However, the former issue was addressed here only partially (a deeper investigation would have required performing more sophisticated nonlinear analyses), whereas the latter was not addressed at all, it being beyond the scope of the present study. On the other hand, much literature on the evaluation of crack location and depth based on measured natural frequencies (and modes) exists (e.g., see [43][44][45][46][47][48][49][50][51][52]). This work represents a first attempt to correlate AE signals produced by material damage with variations in the natural vibration frequencies of a cracking element.…”

The Characteristic Receptance Method for Damage Detection in Large Mono-Coupled Periodic Structures

“…As a result, a method capable of predicting the magnitude as well as the location of damage that requires only the changes in the natural frequencies would be welcomed. Some researchers have proposed several approaches to locate the damage site by using the test natural frequencies [14,15]. Experiments performed by Biswas et al [16] on a highway bridge also demonstrated that changes in the natural frequencies alone could be used to detect damage.…”

Vibration-Based Damage Identification Using Reconstructed FRFS in Composite Structures

“…Many researchers have investigated the global damage identification methods, mostly based on changes on the vibrational characteristics, from various aspects: frequency changes in terms of forward problems [1][2][3], and of inverse problems [4][5][6]; mode shape displacement or curvature/strain changes [7][8][9]. Changes on flexibility or stiffness matrix are also used for the damage identification: flexibility changes [10]; stiffness error matrix method [11]; changes in measured stiffness matrix [12].…”