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

By Antonino Morassi, Fabrizio Vestroni

The publication provides an up to date state of the art review of dynamic equipment for structural overall healthiness tracking and harm detection in constructions, with detailed emphasis on complex learn within the box this present day. the subject is handled as a chain of classes, explaining either theoretical and experimental facets of dynamic non-destructive equipment and their reference to inverse and identity difficulties in structural dynamics.

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Extra resources for Dynamic Methods for Damage Detection in Structures (CISM International Centre for Mechanical Sciences)

Sample text

1), evaluated at the initial parameter values. It would be possible to update each candidate parameter set until convergence, and then compare the performance of the different subsets, although it practice the computational cost is prohibitive. As the model parameters are usually local in nature and may also allow for different damage mechanisms, parameter subset selection selects parameters from x that identify both the damage location and mechanism. This formulation requires the selection of the optimum parameter subset from X.

Zou et al. (2000) detailed further development of these models. One difiiculty with using these models for parameter based identification is that changing the length and position of a delamination requires the model to be remeshed, and care must be exercised in calculating the associated sensitivity matrices. The techniques detailed by Sinha et al. (2002) for the position of cracks might be extended to this case. Paolozzi and Peroni (1990) highlighted that the most sensitive modes are those whose wavelength is approximately the same size as the delamination.

I. 5) is full rank. Un] and V = [viV2 . . 8) where the singular values, cr^, are arranged in descending order ((TI > 0-2 ^ • • • > ^m)- In ill-posed problems two commonly occurring characteristics of the singular values have been observed; the singular values decay steadily to zero with no particular gap in the spectrum, and the left and right singular vectors u^ and v^ tend to have more sign changes in their elements as the index i increases. The solution for the parameters using the SVD is Thus the components of A corresponding to the low singular values have only a small contribution to A but a large contribution to the estimated parameters.

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