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以弱阻尼系统为例，说明了Ｈ∞控制问题中ＲＩＣ法的零极点对消问题；然后通过分析ＬＭＩ法的特点，指出限制ＬＭＩ解的范数可以控制靠近虚轴的闭环极点，即可以通过函数ｈｉｎｆｌｍｉ（）本身的选项来控制极点位置，因此单用混合灵敏度同样可以解决弱阻尼系统的Ｈ∞控制问题，而不必如文［２］那样再增加极点配置的ＬＭＩ约束条件。
Taking weakly damped system as an example, the zero-pole cancellation problem of RIC method in H∞ control problem is described. Then by analyzing the characteristics of LMI method, it is pointed out that the norm of limiting LMI solution can control the closed-loop pole close to the imaginary axis, The function hinflmi () itself has the option of controlling the pole position, so the hybrid sensitivity alone can also solve the H∞ control problem of weakly damped systems without having to add the pole configuration LMI constraints as in [2].