Dynamic Methods for Damage Detection in Structures (CISM by Antonino Morassi, Fabrizio Vestroni

By Antonino Morassi, Fabrizio Vestroni

The ebook provides an up-to-date state of the art evaluation of dynamic equipment for structural future health tracking and harm detection in constructions, with particular emphasis on complicated study within the box at the present time. the subject is handled as a sequence of classes, explaining either theoretical and experimental elements of dynamic non-destructive tools and their reference to inverse and id difficulties in structural dynamics.

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An improved method introduces local fiexibility based on physically based stiffness reductions, where the crack position may be used as a parameter for identification purposes. The second class of methods divides a beam type structure into two parts that are pinned at the crack location and the crack is simulated by the addition of a rotational spring. These approaches are a gross simplification of the crack dynamics and do not involve the crack size and location directly. , 2002; Lee and Chung, 2001).

The differences in the lower natural frequencies are very similar for all models, and these differences are smaller than the changes that would occur due to small modelling errors, or changes due to environmental effects. Of course the accuracy at higher frequencies becomes less since the modes are influenced more by local stiffness variations. Comparison with experimental results The previous section has shown that the natural frequencies predicted from different models are very close. Of course the question is whether the differences in these predictions are smaller than the measurement errors.

L Friswell may also be used, but are more suited to crack propagation studies. , 1995). However the compuational cost of these meshless methods generally exceeds that of conventional finite element analysis (FEA). Rao and Rahman (2001) avoided this difficulty by coupling a meshless region near the crack with an FEA model in the remainder of the structure. The two and three dimensional approaches produce detailed and accurate models but are a complicated and computational intensive approach to model simple structures like beams, and are unlikely to lead to practical algorithms for damage identification.

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