Crack identification by 3D time-domain elastic or acoustic topological sensitivity
نویسندگان
چکیده
منابع مشابه
Crack identification by 3D time-domain elastic or acoustic topological sensitivity
The topological sensitivity analysis, based on the asymptotic behaviour of a cost functional associated with the creation of a small trial flaw in a defect-free solid, provides a computationally-fast, non-iterative approach for identifying flaws embedded in solids. This concept is here considered for crack identification using time-dependent measurements on the external boundary. The topologica...
متن کاملTopological sensitivity for 3D elastodynamic and acoustic inverse scattering in the time domain
Building on previous work for 3D inverse scattering in the frequency domain, this article develops the concept of topological derivative for 3D elastic and acousticwave imaging of media of arbitrary geometry using data in the time domain. The topological derivative, which quantifies the sensitivity of the cost functional associated with the inverse scattering problem due to the creation at a sp...
متن کاملTopological sensitivity and FMM-accelerated BEM applied to 3D acoustic inverse scattering
This study is set in the framework of inverse scattering of scalar (e.g. acoustic) waves. A qualitative probing technique based on the distribution of topological sensitivity of the cost functional associated with the inverse problem with respect to the nucleation of an infinitesimally-small hard obstacle is formulated. The sensitivity distribution is expressed as a bilinear formula involving t...
متن کاملDomain Sensitivity Analysis for Acoustic Scattering Problems
We consider scattering problems described by the Dirichlet boundary value problem for the scalar Helmholtz equation in exterior domains := IR 2 n i : Such problems include the scattering of acoustic waves from a sound-soft obstacle or the scattering of electromagnetic waves from perfectly conducting cylinders. The paper concerns with the characterization of the G^ ateaux derivative of the far-e...
متن کامل3D acoustic frequency-domain full-waveform inversion
We present one of the first attempt at implementing a massively parallel frequency-domain full-waveform inversion algorithm for imaging 3D acoustic media. The inverse method is based on a classic steepest-descent algorithm. The algorithm was designed so that one or several frequencies are inverted at a time. Wave propagation modeling, a key component of the inversion algorithm, is performed wit...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Comptes Rendus Mécanique
سال: 2009
ISSN: 1631-0721
DOI: 10.1016/j.crme.2009.03.015