Abstract: One of ideal methods that deal with variable structure system is treating variable structure problem as load or relieving of constraints. The simplest instance is ideal load of bilateral constraints, which means that there is only ideal constraint force during load. From the point of view of analytical mechanics, the theory of ideal load of bilateral constraint is given. The advantage of the theory is that it reveals mechanical mechanism of ideal load of bilateral constraint and it is more convenient for extension.

Key words: variable structure system, bilateral constraint, ideal load

摘要： 变结构系统理想化处理的方法之一，是把变结构问题看成约束的加载或解除，其中最简单的情况是双面约束的理想加载。所谓理想加载是指加载中的作用力仅是加载约束的理想约束力。从分析力学的角度，给出了双面约束的理想加载的理论。本理论的特点在于揭示了双面约束理想加载的力学实质，而且更便于扩展。

关键词: 变结构系统, 双面约束, 理想加载?