INTEMA   05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Identification of Ultrasonic Properties of Layered Materials.
Autor/es:
MESSINEO, M. G.; FRONTINI G.L.; GAETE GARRETÓN, LUIS
Lugar:
Viena
Reunión:
Conferencia; ECCOMAS , European Congress on Computational Methods in Applied Science and Engineering.; 2012
Resumen:
This work presents a methodology to identify ultrasonic properties of multilayered materials processing data from a transmission experiment. A parameter estimation problem is formulated and solved using a model-based technique. An equivalent model stated for the forward problem saves computational time without lost of accuracy. The proposed proce-dure is based on the recording of the complete waveform after travelling through the set of layers. The model that depends on the parameters is used to predict the transformation of the waveform and compare to the measurement. A scalar cost functional was defined to quantify the misfit between the data, a synthetic waveform in this work, and the numerically predicted waveforms based on the equivalent model. Issues like the solution uniqueness and stability were analyzed. A relation between the frequency range used to evaluate the functional and the existence of multiple minima was found. The simulations proved that the technique is highly robust to noise.