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This paper presents a passivity based formation control strategy for multiple unmanned aerial vehicles (UAVs) cooperatively carrying a suspended load. The control strategy we propose consists of an internal feedback control law for each UAV and a formation control law that regulates the relative position between each UAV. We show that under this control strategy the interconnected system has a continuum of equilibria and prove stability for all equilibrium points where the cables supporting the suspended load are in tension.
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Meissen et al. (2017) studied this question.
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