Switched control of a SCARA robot with shared actuation resources

Maas, A. van der; Steinbuch, Y.F.; Boverhof, A.; Heemels, W.P.M.H.

doi:10.1016/j.ifacol.2017.08.384

Cited by 5 publications

(1 citation statement)

References 6 publications

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“…SCARA robots are high-performance robotic manipulators with relatively simple structure. With three revolute joints (named as shoulder, elbow, and wrist, respectively), a SCARA robot can move its end-effector horizontally, while with a prismatic joint it can move the end-effector vertically [21][22][23][24][25][26]. The configuration of the SCARA robot (Fig.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear optimal control for a 4-DOF SCARA robotic manipulator

et al. 2023

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Selective compliance articulated robot arms (SCARA) robotic manipulators find wide use in industry. A nonlinear optimal control approach is proposed for the dynamic model of the 4-degrees of freedom (DOF) SCARA robotic manipulator. The dynamic model of the SCARA robot undergoes approximate linearization around a temporary operating point that is recomputed at each time-step of the control method. The linearization relies on Taylor series expansion and on the associated Jacobian matrices. For the linearized state-space model of the system, a stabilizing optimal (H-infinity) feedback controller is designed. To compute the controller’s feedback gains, an algebraic Riccati equation is repetitively solved at each iteration of the control algorithm. The stability properties of the control method are proven through Lyapunov analysis. The proposed control method is advantageous because: (i) unlike the popular computed torque method for robotic manipulators, it is characterized by optimality and is also applicable when the number of control inputs is not equal to the robot’s number of DOFs and (ii) it achieves fast and accurate tracking of reference setpoints under minimal energy consumption by the robot’s actuators. The nonlinear optimal controller for the 4-DOF SCARA robot is finally compared against a flatness-based controller implemented in successive loops.

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