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本文对控制系统鲁棒性能设计中的Ｈ∞、μ和Ｑ判据进行了分析和对比．指出结构奇异值（μ）才是控制系统鲁棒性能的充要性判据．文中还配有例题进行说明．
In this paper, the H∞, μ and Q criteria in the robust performance design of control system are analyzed and compared. It is pointed out that the singular value of structure (μ) is the necessary and sufficient criterion for the robust performance of the control system. The article also with examples to explain.