Abstract
The boundary element method is very powerful for inverse analysis of boundary determination type. We discuss elastodynamic inverse analysis applied to crack determination, in which we use a variational boundary element method in conjunction with nonlinear programming for minimizing an objective function expressed by the sum of the squared deviations from the observed data to the calculated values with temporarily assumed boundary parameters. We show some typical example cracks determined by use of the proposed technique devised in both frequency and time domains.
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