Some end value condition derived by variational method in accordance with the least energy loss principle and their mechanical background are also dealt with.
同时从能量最小原理出发，用变分的方法推导出几种端值条件，说明它们的力学背景。
In this paper, based on the variational principle of minimum complementary energy, the method of minimum complementary energy is put forward in calculating structure dynamic stress.
本文以最小余能原理为基础，提出了计算结构动态应力的最小余能法。
By use of the variational method, the potential energy principle of a elastic system on a variable domain is discussed.
并用该变分法讨论了具有可变区域的弹性系统的势能原理。
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