境界要素法による複数の欠陥の同定

概要

論文の詳細を見る
In this paper, location, angle and size of plural defects in a structural component are identified by an elastodynamic boundary element method. Each defect is noncircular and represented by 5 parameters, a radius, an angle, x and y coordinates of the location and the degree of distortion of its shape. External force of harmonic excitation is applied to the component and the displacements at points on its boundary are chosen as additional information. The square sum of the differences in displacements between real values and inference from numerical solutions is minimized to identify the defects using the conjugate gradient method. Though the number of defects is assumed to be one in the beginning of the identification process, the assumed defect is divided into two parts when the value of the parameter representing its distortion satisfies a certain condition. To judge correctly whether it should be divided, it is assumed that defects are filled with imaginary material of which mass density and Young's modulus are considerably low in comparison with those of a structural component.
一般社団法人日本機械学会の論文
2002-07-25