Duffing Oscillator
ẍ + δẋ + αx + βx³ = γcos(ωt) — nonlinear resonance, jump phenomena, chaos. α=−1, β=1, δ=0.3.
γ (forcing amp)
0.30
ω (frequency)
1.20
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Phase portrait (x, ẋ) — Poincaré section (orange dots)
x(t) time series