This paper presents a two-step method for damage localization in beams by combining natural frequencies and mode shapes. The general locations of the are first identified from an indicator developed using relative frequency change (RNFC) curves values RNFCs. A curvature-mode-shape-based is then utilized to determine specific location second step. proposed verified detecting simulated simply-sup...

Y-branch optical waveguides are analyzed in terms of normalized parameters by means of the usual modal analysis. With these parameters the number of variables of the problem is reduced, and universal plots for the mode conversion are obtained. Our results show that the normalized parameters are useful for the design of branching waveguides more tolerant of fabrication errors.

In this paper, a fast frequency domain global modal parameter identification algorithm is proposed. The modal parameters are identified with amplitude square of FRF instead of its traditional real part & imaginary part. By discrete transformation, all additional pseudo roots are reciprocal of the real roots and their conjugates. The physical roots can be separated from mathematical roots with s...

OVERVIEW The efficacy of modal analysis in detecting and localizing damage is debated based on sensitivity concerns – modal frequencies are extremely insensitive to small changes in local parameters and geometry. Convincing evidence of sensitivity issues is vast, and here we cite a single field study of a 163 ft. long, 10 ft. deep experimental test girder from an I40 bridge in Bernalilo County ...