定常约束 又称稳定约束。不随时间变化的一种约束。若完整约束的约束方程中不显含时间t，称该完整约束是定常约束。
本文就质点系平衡问题进行了一般性的推证，给出了当约束是理想、线性定常约束时的质点系平衡的充要条件。
The general inference and demonstration of the equilibrium problem of particle system are carried on, the full and necessary conditions are given while the constraint is ideal, linear and scleronomic.
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.
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