传统支抗控制方法中很难提供绝对稳定的支抗，支抗不足是限制正畸治疗的重要因素之一。
The traditional methods for anchorage control are difficult to provide absolute stability, and lack of anchorage is an important factor of restrictions in orthodontic treatment.
研究结果表明：两个非对绝对稳定的系统可以通过关联或协调控制来实现关联大系统的绝对稳定性。
It is shown that two Lurie control systems which are not absolute stable can be composed of a absolute stable large-scale Lurie control systems via interconnections or harmonic controllers.
在此基础上，获得了保证系统绝对稳定的鲁棒扰动界的LMI，并给出了利用迭代法获得鲁棒扰动界的方法。
Based on this, a LMI for the robust perturbation bound is obtained, and the iteration method is used to calculate the bound.
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