A harmonic model of hydrodynamic forces produced by a flapping fin |
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Authors: | David N. Beal Promode R. Bandyopadhyay |
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Affiliation: | (1) Autonomous Systems and Technology Department, Naval Undersea Warfare Center, Newport, RI, USA |
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Abstract: | The hydrodynamic control laws of unsteady fins inspired by swimming and flying animals are considered. A controller based on cycle-averaged forces requires a bandwidth lower than the flapping frequency, with correspondingly slow reactions to disturbances or commands in order to avoid undesirable feedback from the oscillating fins. A harmonic model of the periodic thruster forces was empirically found using a mechanical fin flapping in roll and pitch in hover, in uniform flow, and under various kinematic conditions. A multi-fin vehicle could use this model to account for the dominant non-linearities and minimize undesirable motions through coordinated control of individual fins. |
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