4.2.2 Flapping Wings -
A flapping wing does not simply move up and down; it traces a complex, figure-eight pattern. To understand , one must first decode the three fundamental angular motions:
| Challenge | Current Status | |-----------|----------------| | | Mostly decoupled or linearized; nonlinear FSI rare. | | Transition to turbulence | Critical for Re ~10⁴–10⁵; poorly modeled. | | 3D wake dynamics | LEV bursting, tip vortices interaction not fully understood. | | Scaling laws | No unified model from insects to birds to MAVs. | | Experimental measurement | Force sensors low bandwidth; DPIV limited to 2D slices. | 4.2.2 flapping wings
Unlike ailerons on a fixed wing, control in is achieved through asymmetry in the flapping cycle: A flapping wing does not simply move up