SDM 2010 Student Papers Competition Aeroelastic Optimization of a Two-Dimensional Flapping Mechanism

A two-dimensional aeroelastic simulation capability is developed for the study of flapping flight. The impact of flexibility on performance of flapping wing micro air vehicles in low- speed forward flight is studied. Flapping motion in pitching and translation is imparted on a two-dimensional rigid plate via elastic supports. The body and wake are modeled using discrete vortices and the structure by a multi-degree-of-freedom spring-mass-damper system. A parametric study and optimization are performed to obtain the maximum propulsive efficiency for the system. Maximum aerodynamic force generation is found to occur near resonance in pitch and plunge where flapping amplitudes are largest and beneficial pitch-plunge phasing is achieved. Response phasing is particularly important in production of thrust versus drag. Comparison of results including and neglecting aeroelastic coupling show that aeroelastic effects must be considered to accurately model the system response.

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