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Analysis of elastoplasticity problems using an improved complex variable element-free Galerkin method 被引量:3
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作者 程玉民 刘超 +1 位作者 白福浓 彭妙娟 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第10期16-25,共10页
In this paper, based on the conjugate of the complex basis function, a new complex variable moving least-squares approximation is discussed. Then using the new approximation to obtain the shape function, an improved c... In this paper, based on the conjugate of the complex basis function, a new complex variable moving least-squares approximation is discussed. Then using the new approximation to obtain the shape function, an improved complex variable element-free Galerkin(ICVEFG) method is presented for two-dimensional(2D) elastoplasticity problems. Compared with the previous complex variable moving least-squares approximation, the new approximation has greater computational precision and efficiency. Using the penalty method to apply the essential boundary conditions, and using the constrained Galerkin weak form of 2D elastoplasticity to obtain the system equations, we obtain the corresponding formulae of the ICVEFG method for 2D elastoplasticity. Three selected numerical examples are presented using the ICVEFG method to show that the ICVEFG method has the advantages such as greater precision and computational efficiency over the conventional meshless methods. 展开更多
关键词 meshless method complex variable moving least-squares approximation improved complex vari- able element-free Galerkin method elastoplasticity
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An improved complex variable element-free Galerkin method for two-dimensional elasticity problems 被引量:3
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作者 Bai Fu-Nong Li Dong-Ming +1 位作者 Wang Jian-Fei Cheng Yu-Min 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第2期56-65,共10页
In this paper, the improved complex variable moving least-squares (ICVMLS) approximation is presented. The ICVMLS approximation has an explicit physics meaning. Compared with the complex variable moving least-squar... In this paper, the improved complex variable moving least-squares (ICVMLS) approximation is presented. The ICVMLS approximation has an explicit physics meaning. Compared with the complex variable moving least-squares (CVMLS) approximations presented by Cheng and Ren, the ICVMLS approximation has a great computational precision and efficiency. Based on the element-free Galerkin (EFG) method and the ICVMLS approximation, the improved complex variable element-free Galerkin (ICVEFG) method is presented for two-dimensional elasticity problems, and the corresponding formulae are obtained. Compared with the conventional EFC method, the ICVEFG method has a great computational accuracy and efficiency. For the purpose of demonstration, three selected numerical examples are solved using the ICVEFG method. 展开更多
关键词 meshless method improved complex variable moving least-squares approximation improved complex variable element-free Galerkin method ELASTICITY
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A new complex variable meshless method for transient heat conduction problems 被引量:5
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作者 王健菲 程玉民 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第12期42-50,共9页
In this paper, based on the improved complex variable moving least-square (ICVMLS) approximation, a new complex variable meshless method (CVMM) for two-dimensional (2D) transient heat conduction problems is pres... In this paper, based on the improved complex variable moving least-square (ICVMLS) approximation, a new complex variable meshless method (CVMM) for two-dimensional (2D) transient heat conduction problems is presented. The variational method is employed to obtain the discrete equations, and the essential boundary conditions are imposed by the penalty method. As the transient heat conduction problems are related to time, the Crank-Nicolson difference scheme for two-point boundary value problems is selected for the time discretization. Then the corresponding formulae of the CVMM for 2D heat conduction problems are obtained. In order to demonstrate the applicability of the proposed method, numerical examples are given to show the high convergence rate, good accuracy, and high efficiency of the CVMM presented in this paper. 展开更多
关键词 meshless method improved complex variable moving least-square approximation com-plex variable meshless method transient heat conduction problem
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A new complex variable element-free Galerkin method for two-dimensional potential problems 被引量:4
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作者 程玉民 王健菲 白福浓 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第9期43-52,共10页
In this paper, based on the element-free Galerkin (EFG) method and the improved complex variable moving least- square (ICVMLS) approximation, a new meshless method, which is the improved complex variable element-f... In this paper, based on the element-free Galerkin (EFG) method and the improved complex variable moving least- square (ICVMLS) approximation, a new meshless method, which is the improved complex variable element-free Galerkin (ICVEFG) method for two-dimensional potential problems, is presented. In the method, the integral weak form of control equations is employed, and the Lagrange multiplier is used to apply the essential boundary conditions. Then the corresponding formulas of the ICVEFG method for two-dimensional potential problems are obtained. Compared with the complex variable moving least-square (CVMLS) approximation proposed by Cheng, the functional in the ICVMLS approximation has an explicit physical meaning. Furthermore, the ICVEFG method has greater computational precision and efficiency. Three numerical examples are given to show the validity of the proposed method. 展开更多
关键词 meshless method improved complex variable moving least-square approximation im- proved complex variable element-free Galerkin method potential problem
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Complex variable element-free Galerkin method for viscoelasticity problems 被引量:2
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作者 程玉民 李荣鑫 彭妙娟 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第9期60-71,共12页
Based on the complex variable moving least-square (CVMLS) approximation, the complex variable element-free Galerkin (CVEFG) method for two-dimensional viscoelasticity problems under the creep condition is presente... Based on the complex variable moving least-square (CVMLS) approximation, the complex variable element-free Galerkin (CVEFG) method for two-dimensional viscoelasticity problems under the creep condition is presented in this paper. The Galerkin weak form is employed to obtain the equation system, and the penalty method is used to apply the essential boundary conditions, then the corresponding formulae of the CVEFG method for two-dimensional viscoelasticity problems under the creep condition are obtained. Compared with the element-free Galerkin (EFG) method, with the same node distribution, the CVEFG method has higher precision, and to obtain the similar precision, the CVEFG method has greater computational efficiency. Some numerical examples are given to demonstrate the validity and the efficiency of the method. 展开更多
关键词 meshless method complex variable moving least-square approximation complex variableelement-free Galerkin method VISCOELASTICITY
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New complex variable meshless method for advection-diffusion problems 被引量:1
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作者 王健菲 程玉民 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第3期92-98,共7页
In this paper,an improved complex variable meshless method(ICVMM) for two-dimensional advection-diffusion problems is developed based on improved complex variable moving least-square(ICVMLS) approximation.The equi... In this paper,an improved complex variable meshless method(ICVMM) for two-dimensional advection-diffusion problems is developed based on improved complex variable moving least-square(ICVMLS) approximation.The equivalent functional of two-dimensional advection-diffusion problems is formed,the variation method is used to obtain the equation system,and the penalty method is employed to impose the essential boundary conditions.The difference method for twopoint boundary value problems is used to obtain the discrete equations.Then the corresponding formulas of the ICVMM for advection-diffusion problems are presented.Two numerical examples with different node distributions are used to validate and investigate the accuracy and efficiency of the new method in this paper.It is shown that ICVMM is very effective for advection-diffusion problems,and has a good convergent character,accuracy,and computational efficiency. 展开更多
关键词 meshless method improved complex variable moving least-square approximation improved complex variable meshless method advection-diffusion problem
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The complex variable meshless local Petrov-Galerkin method of solving two-dimensional potential problems 被引量:1
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作者 杨秀丽 戴保东 张伟伟 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第10期49-55,共7页
Based on the complex variable moving least-square(CVMLS) approximation and a local symmetric weak form,the complex variable meshless local Petrov-Galerkin(CVMLPG) method of solving two-dimensional potential proble... Based on the complex variable moving least-square(CVMLS) approximation and a local symmetric weak form,the complex variable meshless local Petrov-Galerkin(CVMLPG) method of solving two-dimensional potential problems is presented in this paper.In the present formulation,the trial function of a two-dimensional problem is formed with a one-dimensional basis function.The number of unknown coefficients in the trial function of the CVMLS approximation is less than that in the trial function of the moving least-square(MLS) approximation.The essential boundary conditions are imposed by the penalty method.The main advantage of this approach over the conventional meshless local Petrov-Galerkin(MLPG) method is its computational efficiency.Several numerical examples are presented to illustrate the implementation and performance of the present CVMLPG method. 展开更多
关键词 meshless method complex variable moving least-square method complex variable meshless local Petrov-Galerkin method potential problems
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A complex variable meshless local Petrov-Galerkin method for transient heat conduction problems
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作者 王启防 戴保东 栗振锋 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第8期238-244,共7页
On the basis of the complex variable moving least-square (CVMLS) approximation, a complex variable meshless local Petrov-Galerkin (CVMLPG) method is presented for transient heat conduction problems. The method is ... On the basis of the complex variable moving least-square (CVMLS) approximation, a complex variable meshless local Petrov-Galerkin (CVMLPG) method is presented for transient heat conduction problems. The method is developed based on the CVMLS approximation for constructing shape functions at scattered points, and the Heaviside step function is used as a test function in each sub-domain to avoid the need for a domain integral in symmetric weak form. In the construction of the well-performed shape function, the trial function of a two-dimensional (2D) problem is formed with a one-dimensional (1D) basis function, thus improving computational efficiency. The numerical results are compared with the exact solutions of the problems and the finite element method (FEM). This comparison illustrates the accuracy as well as the capability of the CVMLPG method. 展开更多
关键词 meshless method complex variable moving least-square method complex variable meshless localPetrov-Galerkin method transient heat conduction problems
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A complex variable meshless method for fracture problems 被引量:16
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作者 CHENG Yumin1 & LI Jiuhong2 1. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China 2. Department of Building Engineering, Xi’an University of Technology, Xi’an 710048, China 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2006年第1期46-59,共14页
Based on the moving least-square (MLS) approximation, the complex variable moving least-square approximation (CVMLS) is discussed in this paper. The complex variable moving least-square approximation cannot form ill-c... Based on the moving least-square (MLS) approximation, the complex variable moving least-square approximation (CVMLS) is discussed in this paper. The complex variable moving least-square approximation cannot form ill-conditioned equations, and has greater precision and computational efficiency. Using the analytical solution near the tip of a crack, the trial functions in the complex variable moving least-square approxi- mation are extended, and the corresponding approximation function is obtained. And from the minimum potential energy principle, a complex variable meshless method for fracture problems is presented, and the formulae of the complex variable meshless method are obtained. The complex variable meshless method in this paper has greater precision and computational efficiency than the conventional meshless method. Some examples are given. 展开更多
关键词 moving least-square approximation complex variable moving least-square approximation MESHLESS method complex variable MESHLESS method fracture.
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复变量移动最小二乘法及其应用 被引量:41
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作者 程玉民 彭妙娟 李九红 《力学学报》 EI CSCD 北大核心 2005年第6期719-723,共5页
提出了复变量移动最小二乘法,并详细讨论了基于正交基函数的复变量移动最小二乘法.然后,将复变量移动最小二乘法和弹性力学的边界无单元法结合,提出了弹性力学的复变量边界无单元法,推导了相应的公式,并给出了数值算例.基于正交基函数... 提出了复变量移动最小二乘法,并详细讨论了基于正交基函数的复变量移动最小二乘法.然后,将复变量移动最小二乘法和弹性力学的边界无单元法结合,提出了弹性力学的复变量边界无单元法,推导了相应的公式,并给出了数值算例.基于正交基函数的复变量移动最小二乘法的优点是不形成病态方程组、精度高,所形成的无网格方法计算量小.复变量边界无单元法是边界积分方程的无网格方法的直接列式法,容易引入边界条件,且具有更高的精度. 展开更多
关键词 复变量移动最小二乘法 正交基函数 弹性力学 边界积分方程 边界无单元法
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复变量移动最小二乘近似在Sobolev空间中的误差估计 被引量:9
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作者 孙新志 李小林 《应用数学和力学》 CSCD 北大核心 2016年第4期416-425,共10页
复变量移动最小二乘近似是形成无网格法形函数的重要方法,为了研究相应的无网格方法的误差估计,需要先分析复变量移动最小二乘近似的逼近误差.首先介绍了复变量移动最小二乘近似,接着在权函数满足一定假设的条件下,详细讨论了复变量移... 复变量移动最小二乘近似是形成无网格法形函数的重要方法,为了研究相应的无网格方法的误差估计,需要先分析复变量移动最小二乘近似的逼近误差.首先介绍了复变量移动最小二乘近似,接着在权函数满足一定假设的条件下,详细讨论了复变量移动最小二乘近似逼近函数在Sobolev空间中的误差估计,给出了逼近函数在Hk范数下的误差界,分析结果表明逼近函数的误差随着节点间距的减小而降低.最后给出了一个数值算例来验证理论分析的正确性. 展开更多
关键词 复变量移动最小二乘近似 无网格法 SOBOLEV空间 误差分析
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移动最小二乘法研究进展与述评 被引量:41
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作者 程玉民 《计算机辅助工程》 2009年第2期5-11,20,共8页
为使移动最小二乘法能更好地应用到无网格方法中,详细阐述移动最小二乘逼近法、移动最小二乘插值法、MUKHERJEE改进的移动最小二乘法以及程玉民等提出的改进的移动最小二乘法和复变量移动最小二乘法等的研究进展,述评各种移动最小二乘... 为使移动最小二乘法能更好地应用到无网格方法中,详细阐述移动最小二乘逼近法、移动最小二乘插值法、MUKHERJEE改进的移动最小二乘法以及程玉民等提出的改进的移动最小二乘法和复变量移动最小二乘法等的研究进展,述评各种移动最小二乘法的优缺点,并概述各种移动最小二乘法形成的无网格方法的研究进展. 展开更多
关键词 移动最小二乘逼近法 移动最小二乘插值法 改进的移动最小二乘法 复变量移动最小 二乘法 无网格方法
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势问题的复变量插值型无单元Galerkin方法 被引量:3
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作者 任红萍 《力学季刊》 CSCD 北大核心 2012年第1期36-44,共9页
给出了改进的复变量移动最小二乘法,针对其形成的形函数不满足Kronecker Delta函数性质提出了复变量移动最小二乘插值法。将复变量移动最小二乘插值法和势问题的Galerkin积分弱形式相结合,建立了势问题的复变量插值型无单元Galerkin方... 给出了改进的复变量移动最小二乘法,针对其形成的形函数不满足Kronecker Delta函数性质提出了复变量移动最小二乘插值法。将复变量移动最小二乘插值法和势问题的Galerkin积分弱形式相结合,建立了势问题的复变量插值型无单元Galerkin方法。复变量插值型无单元Galerkin方法的优点是,可以减少基函数的个数,且可以直接施加边界条件,从而提高计算效率。最后给出了数值算例说明了该方法的有效性。 展开更多
关键词 移动最小二乘逼近法 复变量插值型无单元Galerkin方法 势问题 无网格方法
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弹性力学的复变量无网格流形方法
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作者 高洪芬 程玉民 姜海辉 《应用力学学报》 CAS CSCD 北大核心 2010年第1期15-19,共5页
为克服无网格流形方法配点过多、计算速度慢、容易形成病态方程组等缺点,将复变量移动最小二乘法与无网格流形方法相结合,提出了弹性力学的复变量无网格流形方法。分别采用线性基本与二次基进行计算,并与无网格流形方法相比。研究表明... 为克服无网格流形方法配点过多、计算速度慢、容易形成病态方程组等缺点,将复变量移动最小二乘法与无网格流形方法相结合,提出了弹性力学的复变量无网格流形方法。分别采用线性基本与二次基进行计算,并与无网格流形方法相比。研究表明该方法计算量小、精度高。 展开更多
关键词 无网格方法 数值流形方法 复变量移动最小二乘法 无网格流形方法 弹性力学
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复变量移动最小二乘近似误差分析
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作者 孙新志 《西南大学学报(自然科学版)》 CAS CSCD 北大核心 2017年第2期66-72,共7页
复变量移动最小二乘近似是形成无网格法逼近函数的重要方法之一.首先介绍了复变量移动最小二乘近似,接着在权函数及节点分布满足一定假设的条件下,详细讨论了复变量移动最小二乘近似逼近函数及其偏导数的误差估计,最后给出了数值算例.
关键词 复变量移动最小二乘近似 无网格方法 误差分析
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势问题的复变量无单元Galerkin方法 被引量:2
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作者 刘沛 彭妙娟 程玉民 《计算机辅助工程》 2009年第4期10-14,共5页
为提高无单元Galerkin(Element-Free Galerkin,EFG)方法的计算效率,将复变量移动最小二乘法与EFG方法结合,利用控制方程的积分弱形式并采用Lagrange乘子法引入边界条件,提出势问题的复变量无单元Galerkin(Complex Variable EFG,CVEFG)方... 为提高无单元Galerkin(Element-Free Galerkin,EFG)方法的计算效率,将复变量移动最小二乘法与EFG方法结合,利用控制方程的积分弱形式并采用Lagrange乘子法引入边界条件,提出势问题的复变量无单元Galerkin(Complex Variable EFG,CVEFG)方法,并推导相关公式.与传统的EFG方法相比,该方法采用复变量移动最小二乘法可以减少试函数中的待定系数,从而减少计算量、提高计算效率.最后,给出数值算例验证该方法的有效性. 展开更多
关键词 无网格方法 复变量移动最小二乘法 复变量无单元Galerkin方法 势问题
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Meshless acoustic analysis using a weakly singular Burton-Miller boundary integral formulation
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作者 Linchong CHEN Xiaolin LI 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2020年第12期1897-1914,共18页
The Burton-Miller boundary integral formulation is solved by a complex variable boundary element-free method(CVBEFM)for the boundary-only meshless analysis of acoustic problems with arbitrary wavenumbers.To regularize... The Burton-Miller boundary integral formulation is solved by a complex variable boundary element-free method(CVBEFM)for the boundary-only meshless analysis of acoustic problems with arbitrary wavenumbers.To regularize both strongly singular and hypersingular integrals and to avoid the computation of the solid angle and its normal derivative,a weakly singular Burton-Miller formulation is derived by considering the normal derivative of the solid angle and adopting the singularity subtraction procedures.To facilitate the implementation of the CVBEFM and the approximation of gradients of the boundary variables,a stabilized complex variable moving least-square approximation is selected in the meshless discretization procedure.The results show the accuracy and efficiency of the present CVBEFM and reveal that the method can produce satisfactory results for all wavenumbers,even for extremely large wavenumbers such as k=10000. 展开更多
关键词 meshless method complex variable moving least-square approximation boundary element-free method Burton-Miller formulation REGULARIZATION high frequency acoustic problem large wavenumber
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弹性力学的复变量无网格方法 被引量:41
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作者 程玉民 李九红 《物理学报》 SCIE EI CAS CSCD 北大核心 2005年第10期4463-4471,共9页
在移动最小二乘法的基础上,提出了复变量移动最小二乘法.复变量移动最小二乘法的优点是采用一维基函数建立二维问题的逼近函数,所形成的无网格方法计算量小.然后,将复变量移动最小二乘法应用于弹性力学的无网格方法,提出了复变量无网格... 在移动最小二乘法的基础上,提出了复变量移动最小二乘法.复变量移动最小二乘法的优点是采用一维基函数建立二维问题的逼近函数,所形成的无网格方法计算量小.然后,将复变量移动最小二乘法应用于弹性力学的无网格方法,提出了复变量无网格方法,推导了复变量无网格方法的公式.与传统的无网格方法相比,复变量无网格方法具有计算量小、精度高的优点.最后给出了数值算例. 展开更多
关键词 移动最小二乘法 复变量移动最小二乘法 无网格方法 弹性力学 复变量无网格方法 复变量 逼近函数 二维问题 数值算例 计算量
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弹性大变形问题的复变量无单元Galerkin方法 被引量:24
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作者 李冬明 彭妙娟 程玉民 《中国科学:物理学、力学、天文学》 CSCD 北大核心 2011年第8期1003-1014,共12页
基于复变量移动最小二乘法,建立了适合于大位移、大转动等弹性大变形问题的复变量无单元Galerkin方法.复变量移动最小二乘法的优点是采用一维基函数构造二维问题的试函数.将复变量移动最小二乘法应用于弹性大变形平面问题,结合大变形问... 基于复变量移动最小二乘法,建立了适合于大位移、大转动等弹性大变形问题的复变量无单元Galerkin方法.复变量移动最小二乘法的优点是采用一维基函数构造二维问题的试函数.将复变量移动最小二乘法应用于弹性大变形平面问题,结合大变形问题的Galerkin积分弱形式,采用罚函数法施加本质边界条件,建立了全Lagrange格式下的弹性大变形问题的复变量无单元Galerkin方法,推导了相应的计算公式,数值实现中采用了Newton-Raphson迭代法.最后通过数值算例证明了该方法的有效性. 展开更多
关键词 无网格方法 移动最小二乘法 复变量移动最小二乘法 无单元Galerkin方法 复变量无单元Galerkin方法 大变形问题
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黏弹性问题的改进的复变量无单元Galerkin方法 被引量:2
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作者 彭妙娟 刘茜 《物理学报》 SCIE EI CAS CSCD 北大核心 2014年第18期40-48,共9页
基于改进的复变量移动最小二乘法,提出了二维黏弹性问题的改进的复变量无单元Galerkin方法.采用改进的复变量移动最小二乘法建立形函数,根据Galerkin积分弱形式建立求解方程,并用罚函数法施加本质边界条件,推导了二维黏弹性问题的改进... 基于改进的复变量移动最小二乘法,提出了二维黏弹性问题的改进的复变量无单元Galerkin方法.采用改进的复变量移动最小二乘法建立形函数,根据Galerkin积分弱形式建立求解方程,并用罚函数法施加本质边界条件,推导了二维黏弹性问题的改进的复变量无单元Galerkin方法的计算公式.最后,通过实际算例,将计算结果与复变量无单元Galerkin方法及有限元法的结果进行了对比,说明了本文方法具有更高的计算精度和计算效率. 展开更多
关键词 无网格方法 复变量移动最小二乘法 改进的复变量无单元Galerkin方法 黏弹性问题
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