对于多自由度定常约束微振力学系统的数学建模有许多方法，但这些方法不是受到使用条件限制就是计算繁琐，并且不适合于计算机建模。
Although there are many methods of building mathematical model for permanently constrained discrete system, the methods are usually toilsome and not convenient for computer modeling.
关心技术的假设条件和数学基础，以及这些假设对分析功能的限制程度。
We are concerned with the assumptions and underlying mathematical basis for widely-used techniques, and the degree to which analytical capabilities are constrained by those assumptions.
研究表明：采用超结构数学优化模型可以综合考虑系统的各种限制条件对氢气网络进行优化。
The matching relationships of sources and sinks in hydrogen distribution network are compared before and after optimization. It shows that the superstructure model is effective.
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