Record number :
854213
Title of article :
On the identification of the flatness of a sound-hard acoustic crack Original Research Article
Author/Authors :
C.J.S Alves، نويسنده , , P Serranho، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2004
Pages :
17
From page :
337
To page :
353
Abstract :
In this paper, we present results concerning the far field pattern generated by flat and almost flat cracks in 3D and the possibility of identifying these geometrical features from direct inspection of the far field pattern. We address the direct problem using a variational formulation of the boundary integral equation to avoid the hipersingularity in the double layer potential representation. Concerning the inverse problem, some estimates presenting a direct dependence on the far field behavior and the flatness of the crack are derived. From the knowledge of the plane that defines the main directions of the crack it is possible to get a first approximation that may be used as an initial guess for the Newton method. Numerical simulations validate the direct relation between a far field plane having almost null amplitude and the main directions of a plane that defines an almost flat crack.
Keywords :
3D acoustic scattering , Cracks , Inverse problems
Journal title :
Mathematics and Computers in Simulation
Serial Year :
2004
Link To Document :
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