Phase Portraits of the Autonomous Duffing Single-Degree-of-Freedom Oscillator with Coulomb Dry Friction

Table 1

Equilibrium points of the linear system.

		Saddle	Inf. num. of; equilibrium; points	Unstable node; Unstable inflected node; Unstable focus
		Saddle	Inf. num. of; equilibrium; points	Centre
		Saddle	Inf. num. of; equilibrium; points	Stable node; Sable inflected node; Stable focus