Sensitizing The Mode Shapes Of Beam Towards Damage Detection Using Curvature And Wavelet Transform

Abstract The paper presents the numerical studies for damage detection in beam structure with mode shape curvatures and its spatial wavelet transform. A small simulated perturbation in the form of transverse slots to be treated as damage in beams and a three stage damage detection process for amplifying the discontinuityis proposed here. Vibration data obtained from the perturbed system is processed for mode shapes which are converted into mode shape curvatures and subsequently fed to the wavelet transform. The study revealsthat the proposed transformation is better in sensitizing damage-induced features than the classical approach based alone on bare modal data. It is observed that the decomposition of the spatial signal into wavelet details can identify the damage position in beam like structure by showing relatively larger peaks at the position of the damage.