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《Journal of Natural Science of Hunan Normal University》 2017-04
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An Inverse Approach to Identify Material Properties of an Orthotropic Medium by the MLNNI Method

YANG Xiao-juan;TIAN Wang-peng;XIONG Yong-gang;College of Science,Hunan University of Technology;Department of Mechanical and Electrical Engineering,Hunan Urban Professional College;  
To determine material parameters of two-dimensional orthotropic materials,a new identification approach is proposed in this work based on the meshless local natural neighbor interpolation (MLNNI) method.It is only necessary to construct an array of nodes in the targeted domain.The identification inverse problem is formulated as the minimization of an objective function representing the difference between numerical simulation displacements and measured data.Sensitivity coefficients used to obtain parameter updates are calculated by the complex variable differentiation method (CVDM).Unlike the finite difference method,CVDM has the advantage of step size insensitivity and sufficiently small steps.The accuracy of the sensitivity coefficients can approach the computer precision.Based on the investigation of numerical example,high accuracy results have been obtained,which demonstrates the potential of our proposed approach.
【Fund】: 湖南省自然科学基金资助项目(2017JJ2065);; 教育部人文社会科学研究青年基金资助项目(10YJC630338)
【CateGory Index】: TU599
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