Print Email Facebook Twitter Error analysis and reliability of zero-order Lamb mode inversion for waveguide characterization Title Error analysis and reliability of zero-order Lamb mode inversion for waveguide characterization Author Sabbadini, A. Massaad, J. van Neer, P.L.M.J. de Jong, N. Verweij, M.D. Publication year 2022 Abstract In recent years, several fitting techniques have been presented to reconstruct the parameters of a plate from its Lamb wave dispersion curves. Published studies show that these techniques can yield high accuracy results and have the potential of reconstructing several parameters at once. The precision with which parameters can be reconstructed by inverting Lamb wave dispersion curves, however, remains an open question of fundamental importance to many applications. In this work, we introduce a method of analyzing dispersion curves that yields quantitative information on the precision with which the parameters can be extracted. In our method, rather than employing error minimization algorithms, we compare a target dispersion curve to a database of theoretical ones that covers a given parameter space. By calculating a measure of dissimilarity (error) for every point in the parameter space, we reconstruct the distribution of the error in that space, beside the location of its minimum. We then introduce dimensionless quantities that describe the distribution of this error, thus yielding information about the spread of similar curves in the parameter space. We demonstrate our approach by considering both idealized and realistic scenarios, analyzing the dispersion curves obtained numerically for a plate and experimentally for a pipe. Our results show that the precision with which each parameter is reconstructed depends on the mode used, as well as the frequency range in which it is considered Subject Lamb waveMulti-parameter inversionNon-destructive testingSensitivityCurve fittingDispersion (waves)ErrorsParameter estimationReliability analysisSensitivity analysisSurface wavesUltrasonic wavesDispersion curvesLamb modesLamb waveMulti-parameter inversionMultiparametersParameter spacesParameters inversionWave dispersionZero orderNondestructive examinationquantitative analysisreliabilitytheoretical study To reference this document use: http://resolver.tudelft.nl/uuid:72a3a33a-eb92-4cdc-9f42-3abbfdca41de TNO identifier 967450 ISSN 0041-624X Source Ultrasonics, 123 (123) Document type article Files To receive the publication files, please send an e-mail request to TNO Library.