On the basis of phase space analysis about measured vibration signals, the characteristics of special nonlinear autonomousvibration about the structure included in the system were obtained.
在实测的振动信号相空间分析的基础上，得到系统所包含的结构振动的特殊非线性自主振动的特征。
2
The forced vibration of pendulum is described by four-dimensional phase space and the fourth order autonomous ordinary differential equation.