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This paper presents the adaptive cross approximation (ACA) algorithm to accelerate boundary element method (BEM) for eddy current nondestructive evaluation (NDE) problem. The eddy current problem is formulated by boundary integral equation and discretized into matrix equations by BEM. Stratton–Chu formulation is selected and implemented for the conductive medium which does not has low frequency breakdown...
In order to detect pipelines underground to avoid accidents in urban construction, ground penetrating radar (GPR) is applied for non-destructive evaluation. Surface integral equations are used to model the scattering properties of the underground pipes and method of moment (MoM) is used to solve the equations. Since both multi-level fast multi-pole algorithm (MLFMA) and adaptive cross approximation...
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