Self-sustained oscillations of a double aerodynamic pendulum

A mechanical system is considered that represents an elastically mounted double aerodynamic pendulum. Conditions of instability of the trivial equilibrium of the pendulum (where both links are oriented along the flow) are obtained. When these conditions are met, the pendulum can perform oscillations, energy of which can be converted, e.g., into electric power. Dependence of characteristics of oscillatory regimes upon the external load is studied. The load is described by introducing damping into the first joint of the pendulum.