中文摘要：

完成稳定性是在控制系统设计的必要问题。在这篇论文，能被用来计算间隔植物家庭的稳定性边缘的四条途径被总结并且比较。μ 途径给稳定性边缘，和好评价的界限能与数字方法被获得。特征值途径收益精确价值，和 MATLAB 的函数 robusts 标签有时提供错误的结果。自从特征值途径，是精确的并且计算联盟者有效，它为稳定性边缘的计算被推荐，当功能 robusts 标签的利用应该由于不可靠的结果被避免时，它给。

英文摘要：

Achieving stability is the essential issue in the control system design. In this paper, four approaches that can be used to calculate the stability margin of the interval plant family are summarized and compared. The μ approach gives the bounds of the stability margin, and good estimation can be obtained with the numerical method. The eigenvalue approach yields accurate value, and the MATLAB＇s function robuststab sometimes provides wrong results. Since the eigenvalue approach is both accurate and computationally efficient, it is recommended for the calculation of the stability margin, while utilization of the function robuststab should be avoided due to the unreliable results it gives.