Stabilization control of a hovering model insect: lateral motion |
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Authors: | Yan-Lai Zhang and Mao Sun |
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Institution: | Yan-Lai Zhang · Mao Sun Ministry-of-Education Key Laboratory of Fluid Mechanics,Beihang University,100191 Beijing,China |
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Abstract: | Our previous study shows that the lateral disturbance motion of a model drone fly does not have inherent stability (passive
stability), because of the existence of an unstable divergence mode. But drone flies are observed to fly stably. Constantly
active control must be applied to stabilize the flight. In this study, we investigate the lateral stabilization control of
the model drone fly. The method of computational fluid dynamics is used to compute the lateral control derivatives and the
techniques of eigenvalue and eigenvector analysis and modal decomposition are used for solving the equations of motion. Controllability
analysis shows that although inherently unstable, the lateral disturbance motion is controllable. By feeding back the state
variables (i.e. lateral translation velocity, yaw rate, roll rate and roll angle, which can be measured by the sensory system
of the insect) to produce anti-symmetrical changes in stroke amplitude and/or in angle of attack between the left and right
wings, the motion can be stabilized, explaining why the drone flies can fly stably even if the flight is passively unstable. |
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Keywords: | Hovering drone fly · Lateral motion · Flight stability · Stabilization control · Modal analysis |
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