%0 Journal Article
%T Initial Estimates in Digital-image Correlation Method by a New Displacement Mode<br>非常应变模式数字相关方法的初值估计
%A JI Hong Wei
%A QIN Yu Wen
%A LU Hua
%A <br>计宏伟
%A 秦玉文
%J 实验力学
%D 2001
%I 
%X On the basis of a new displacement mode for Digital image Correlation Method, both the Jacobian Vector and the Hessian matrix of Newton Raphson iterative procedure are given. The initial estimates of displacement and displacement gradients for Newton Raphson iteration are studied. Two methods of initial estimates are proposed: (1) using real time image subtraction scheme and a micro motion compensation mechanism to take zero constantly as initial estimates; (2) using fast iteration to give the initial estimates of displacement. Some problems in the initial estimates and the convergence of Newton Raphson iteration are discussed.
%K digital
%K image correlation method(DICM)
%K subset displacement mode
%K real
%K time subtraction
%K fast iteration<br>数字相关
%K 子区位移模式
%K 实时相减
%K 快速迭代
%K 非常应变模式
%K 初值估计
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=5D344E2AD54D14F8&jid=49067A0A0D864088C06A84AACB51A5B2&aid=CF05A7CE050C870F&yid=14E7EF987E4155E6&vid=7801E6FC5AE9020C&iid=CA4FD0336C81A37A&sid=2A3781E88AB1776F&eid=E514EE58E0E50ECF&journal_id=1001-4888&journal_name=实验力学&referenced_num=0&reference_num=4