摘要
利用变分法研究了二阶椭圆型方程混合边值问题的变分原理,论证了最小位能原理和虚功原理。在古典解的条件下,边值问题、变分问题和变分方程是等价的;但变分问题和变分方程还存在边值问题的广义解。文章最后利用变分原理和分片多项式插值相结合的有限元法,给出了一个典型算例。
This paper studies the variation principle about the mixed boundary value problem of second (order) elliptic differential equation by the calculus of variation and strictly testifies the principle of minimum potential energy and the principle of virtual work. Under the condition of classic solution, the boundary value problem, variation problem and variation equation are equivalent. But there exists generalized (solution) of the boundary value problem between variation probem and variation equation. At last, a model example is supplied by the finite element method which is combined by variation principle and piecewise polynomial interpolation.
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2004年第3期325-330,共6页
Journal of Chengdu University of Technology: Science & Technology Edition
关键词
变分法
极小位能原理
虚功原理
分片多项式插值
calculus of variation
principle of minimum potential energy
principle of virtual work
(piecewise) polynomial interpolation
