The stability of the helical equilibrium is analyzed with phase plane method, and an analytical criterion of stability is revealed.
用相平面法分析螺旋线平衡的稳定性，导出解析形式的稳定性条件。
In the case of plane motion, the phase plane method can be used to analyse the motion qualitatively.
对于平面运动的特殊情形，可在相平面内进行定性分析。
In order to obtain the phase plane of higher order nonlinear control system, a new graphic method of phase locus of phase plane for higher order nonlinear.
为得到高阶非线性系统的相平面，借助状态空间法，提出一种利用图解方法实现高阶非线性系统相轨迹的作图方法。
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