首页 | 本学科首页   官方微博 | 高级检索  
     检索      

改进广义移动最小二乘近似的无网格法
引用本文:黄娟,姚林泉.改进广义移动最小二乘近似的无网格法[J].上海力学,2007,28(3):461-470.
作者姓名:黄娟  姚林泉
作者单位:苏州大学数学科学学院 江苏苏州215006
基金项目:江苏省自然科学基金,暨南大学重点实验室基金
摘    要:无网格法是求解微分方程定解问题的一种新数值方法.移动最小二乘近似只要求近似函数在各节点处的误差的平方和最小,对近似函数导数的误差没有任何约束.而广义移动最小二乘近似要求近似函数及其导数在所有节点处的误差的平方和最小.为了降低计算工作量,本文构造了要求近似函数在全部节点处和任意阶导数在部分节点处误差的平方和最小的改进广义移动最小二乘近似.数值计算显示本文提供的方法关于函数值和各阶导数值都具有很高的精度.

关 键 词:无网格法  移动最小二乘近似  广义移动最小二乘近似
文章编号:0254-0053(2007)03-461-10
修稿时间:2007-02-12

Meshless Method with Modifying Generalized Moving Least Squares Approximation
HUANG Juan,YAO Lin-quan.Meshless Method with Modifying Generalized Moving Least Squares Approximation[J].Chinese Quarterly Mechanics,2007,28(3):461-470.
Authors:HUANG Juan  YAO Lin-quan
Institution:School of Mathematical Science, Suzhou University, Suzhou 215006, China
Abstract:Meshless method is a new numerical method on problem for determining solution of differential equation.The moving least squares approximation makes only require least squares approximation with regard to functional value on all nodes.It makes no require for the residual of derivative approximation.However,the generalized moving least squares approximation makes require least squares approximation with regard to functional and its derivative value on all nodes.For the sake of decrease the computing time,modifying generalized moving least squares approximation was constructed under adding the residual of high orders derivative only on the portion nodes.The numerical examples show that the modifying generalized moving least squares approximation has high accuracy not only for function value but also first or higher orders derivatives.
Keywords:meshless method  moving least squares approximation  generalized moving least squares approximation
本文献已被 CNKI 维普 万方数据 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号