讨论了精馏塔mesh方程组的求解方法，介绍了相平衡系数简化模型及构造的双重迭代算法。

This paper discusses the methods for solving MESH equation groups for a distillation tower. A phase equilibrium coefficient simplified model and a binary iteration algorithm are proposed.

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而后，利用拟弹性叠加、双重迭代给出一种快速解弹塑性接触问题的有限元算法。

Then a finite element method for quickly solving elastoplastic contact problems is presented by using quasi-elastic summation and double-iteration.

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