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ADJOINT NUMERICAL METHOD FOR THE IDENTIFICATION OF THE LAME COEFFICIENTS IN LINEAR ELASTIC WAVE FIELD

机译:线性弹性波场中的莱姆系数识别的辅助数值方法。

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The purpose of this research is to propose a numerical method for the problem of the identification of the elastic coefficients in linear elastic wave field: Determine unknown Young's modulus and Poisson's ratio from the knowledge of the plural sets of simultaneous displacement and traction on the surface of an isotropic, linearly elastic bounded body. The elastic body is supposed to be a state of the plane strain. We assume that the density is known in the elastic body. In this research, the Lame coefficients are identified instead of determining unknown Young's modulus and Poisson's ratio. To determine the unknown Lame coefficients numerically, we adopt the adjoint numerical method. The minimizing problem with some constrains is introduced by using variational method. To find the minimum, a technique based on the projected gradient method is proposed. By numerical experiment, we discuss about the efficacy of our algorithm.
机译:这项研究的目的是为解决线性弹性波场中弹性系数的识别问题提出一种数值方法:利用多组同时位移和牵引力的知识确定未知的杨氏模量和泊松比。各向同性的线性弹性有界物体。弹性体被认为是平面应变的状态。我们假设密度在弹性体中是已知的。在这项研究中,确定了me腿系数,而不是确定未知的杨氏模量和泊松比。为了用数值方法确定未知的Lame系数,我们采用了伴随数值方法。通过变分法介绍了一些约束最小化的问题。为了找到最小值,提出了一种基于投影梯度法的技术。通过数值实验,我们讨论了算法的有效性。

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