Energy-Based Control and LMI-Based Control for a Quadrotor Transporting a Payload
Résumé
This paper presents the control of a quadrotor with a cable-suspended payload.
The proposed control structure is a hierarchical scheme consisting of an energy-based control
(EBC) to stabilize the vehicle translational dynamics and to attenuate the payload oscillation,
together with a nonlinear state feedback controller based on an linear matrix inequality (LMI)
to control the quadrotor rotational dynamics. The payload swing control is based on an energy
approach and the passivity properties of the system’s translational dynamics. The main advantage of
the proposed EBC strategy is that it does not require excessive computations and complex partial
differential equations (PDEs) for implementing the control algorithm. We present a new methodology
for using an LMI to synthesize the controller gains for Lipschitz nonlinear systems with larger
Lipschitz constants than other classical techniques based on LMIs. This theoretical approach is
applied to the quadrotor rotational dynamics. Stability proofs based on the Lyapunov theory for
the controller design are presented. The designed control scheme allows for the stabilization of
the system in all its states for the three-dimensional case. Numerical simulations demonstrating
the effectiveness of the controller are provided.