modified variational Principle [力] 修正变分原理
gibbs variational principle gibbs变分原理
adjoint variational principle 伴随变分原理
hamilton variational principle hamilton变分原理
In spite of the very close affinity between the variational theorems and the principle of virtual work the study of the former is worth-while.
尽管变分定理与虚功原理之间有很紧密的相似关系，然而对前者的研究仍然是有价值的。
By variational principle we obtain a system of differential equations and corresponding boundary conditions.
利用变分原理得到平衡微分方程组和相应的边界条件。
We first improve the complementary variational principle.
首先改进互补变分原理。
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