Figure 10

Phase portraits of the device obtained for \(f\) = 50 Hz and when the magnitude of the external signal varies: (a) and (b) for \(E_{m} = 20\;{\text{V}}\); (c) and (d) for \(E_{m} = 50\;{\text{V}}\) with \(R_{0} = 1 \, \Omega\) and the damping coefficient is fixed at δ₁ = 1.925.