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Comprehensive study on control stability analysis before controller design is an indispensable important step for any flight system. In this paper, frequency modal responses and relative input-output controllability are analyzed quantitatively to provide valid instruction for structure improvement. In this project, tilting electric ducted fan (EDF) system is devised for an unmanned tandem ducted fan...
Different from previous works that require prior trim conditions on the helicopter, this paper proposes a hierarchical PD controller that is robust in controlling untrimmed and therefore critically unstable helicopters. This controller can yield asymptotic stability of the helicopter in horizontal motion control, which can be proven by the linear stability analysis. And this controller can flawlessly...
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