As an absolute unstable controlled system, inverted pendulum is a high order, nonlinear, strong coupling plant. So it may prove the ability of a new control technique in theory.

倒立摆系统是一个绝对不稳定的系统，具有高阶次、非线性、强耦合等特性，很多控制方法的验证都是通过对倒立摆的控制来实现的。

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We have evaluated the absolute stability criterion and have obtained, by the aid of computer, the boundary lines between the stable and unstable regions.

借助于电子计算机，得到了稳定区和非稳定区的边界曲线。

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