In the variational equation, there is only line integral.
在变分方程中，只存在线积分，没有面积分。
Finally, based on the total variational equation, the finite element method of these problems is also discussed.
最后讨论了利用全变分方程建立有限元的方法。
In this paper, large amplitude variational equation of conical shallow thin shells is derived according to the principle of minimal action quantity.
本文首先用最小作用量原理推导出扁薄锥壳大振幅的变分方程。
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