第一部門：物理数学力学問題 （B）

[S01B-05] Shape reconstruction for a defect using 3-D elastodynamic time-reversal analysis with topological sensitivity

Takahiro Saitoh¹, *Fumiya Yamazaki¹, Masahiko Tashiro¹, Kazushi Kimoto² (1. Gunma University, 2. Okayama University)

Keywords:Time-domain BEM, Topological sensitivity, Time-reversal method, Matrix array transducer, 3-D elastodynamics

This study conducts 3-D elastodynamic time-reversal analysis using topological sensitivity. The timereversal method is one of the effective inverse scattering technique to detect a defect in elastic solids.
The topological sensitivity is utilized to determine the convergence area of time-reversed waves from
receiver points. The convolution quadrature time-domain boundary element method(CQBEM) for
3-D elastodynamics is used to obtain scattered and time-reversed wave fields. Some defect detection
results obtained by using this approach are demonstrated to investigate the performance of the
present method.