Fig. 6: Extrema of the washboard potential.
From: Synchronization of non-weakly coupled aeroelastic oscillators
The local extrema of \(V(\psi )\) [Eq. (12)] in each 2π interval corresponds to synchronized states, where local minima are stable states, and local maxima are unstable states. If d > 0, then for small values of Δω, there are two pairs of stable and unstable synchronized states (a); for moderate values of Δω, there is a single pair of stable and unstable synchronized states (b), and there are no synchronized states for large values of Δω (c).
