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A fault tolerant cooperative control (FTCC) strategy for a team of an unmanned aerial vehicle (UAV) and unmanned ground vehicles (UGVs) in the presence of actuator faults are investigated in this paper. A combination of a linear model predictive control (MPC) and input-output feedback linearization is implemented on each UGV, while a combination of a sliding mode control and linear quadratic regulator...
In this paper, a leader-follower formation control of multiple unmanned aerial vehicles (UAVs) design methodology is proposed to keep the desired formation, while simultaneously deal with the potential collision and actuator faults. The proposed formation control is divided into outer-loop and inner-loop controllers. First, a leader-follower control structure is constructed as the outer-loop controller...
In this paper, we propose an Integrated Fault Tolerant Controller (IFTC) for quadrotor UAVs based on Sliding Mode Passive and Active FTCs, along with Trirotor conversion maneuver. A Sliding Mode Observer is used to detect and estimate actuator faults affecting rotors, and a fault severity based decision station activates the suitable controller. The new controller not only ensures fault tolerance,...
In this paper, the Nonlinear Model-Free Observer (NMFO) is proposed to estimate the states of the quadrotor vehicle. NMFO is an integrated structure of the Model-Free technique and the nonlinear Thau observer. The Thau observer will accommodate for the nonlinearities in the quadrotor model and MFO will compensate for the un-modeled dynamics, modeling errors, and the system uncertainties. Flight test...
This paper focuses on modeling and robust hover control system design for a novel multi-tandem ducted fan vehicle. A comprehensive nonlinear model for this unmanned aircraft, considering main aerodynamic coupling and actuator dynamics, is first presented. For the sake of low order controllers, the two-layer controller structure with only three-order controllers, is adopted to construct a flight control...
Current solutions to deal with control objectives in over-actuated systems consist in distributing control efforts among redundant actuators. However, there is no or little consideration on the employed criteria to achieve such distribution. This paper proposes reliable control allocation methods where the objective is to manage control inputs in order to maintain system performance and at the same...
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