Fig. 1: Coupled aeroelastic oscillators.
From: Synchronization of non-weakly coupled aeroelastic oscillators
a Each of the two identical rigid prisms (mass m, length ℓp, and rectangular cross-section h × h) is connected to a pair of identical elastic aluminum cantilevers with a mass density per unit length ρ, flexural rigidity EI, and variable length ℓ1,2. b The variable length of the cantilevers ℓ1,2, enables control of the oscillation frequency of the prisms and can be adjusted (from anchor to prism) in the range of 0.56–0.62 m. The white scale bar shows a length of 20 cm. c The upstream speed U∞ of the air in the streamwise direction of the test section produces transverse forces on the prisms \({F}_{{q}_{1,2}}\) that induce self-sustained oscillations of the prisms, q1(t) and q2(t). d The prisms interact with each other via a pair of viscoelastic springs (ccpl, kcpl) that are attached to the upper and lower cantilevers. The coupling strength is adjusted by changing the springs' distance from the cantilevers' clamped end ℓs. e The coupling springs are covered by a custom-made 3D-printed smooth pipe to prevent buckling and minimize energy dissipation due to friction and anchoring losses.
