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Robust nonlinear PI for attitude stabilization of a four-rotor mini-aircraft: From theory to experiment

Bouchoucha M., Tadjine M., Tayebi A., Mullhaupt P., Bouabdallah S.

Archives of Control Sciences

2008

Vol. 18, no. 1

99-120

Based on the Euler angles parametrization, a new method for the attitude control of a vertical take-off and landing (VTOL) quadrotor aircraft is proposed. It relies on the combination of the backstepping technique and a nonlinear robust PI controller. The integral action gain is nonlinear and based on a switching function that allows a robust behavior for the overall control law. One of the strengths of the proposed approach is its robustness with respect to plant parameters uncertainties. The proposed approach has been tested in simulation and in real time and shows good performance.

Modeling and motion planning for a class of weight handling equipment

Kiss B., Levine J., Mullhaupt P.

Systems Science

2000

Vol. 26, nr 4

79-92

A unified framework for the modeling of a class of weight handling equipment (WHE) is presented. The dynamic equations are obtained using Lagrange multipiers associated to geometric constraints between generalized coordinates. This approach provides a simple way to show differential flatness for all WHEs of the class. The flatness property can then be exploited for motion planning.