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• W2969389620 abstract "In this paper, we propose an alternative, simple, yet efficient estimation method to handle unknown dynamics and external disturbances for motion control of robotic systems. An unknown system dynamics estimator (USDE) is first proposed by introducing filter operations and simple algebraic calculations, where the external disturbances and unknown Coriolis/gravity dynamics can be estimated simultaneously. In the specific case where only the external disturbance is unknown, a further modified unknown disturbance estimator (MUDE) is introduced. These proposed USDE and MUDE can be easily implemented and their parameter tuning is straightforward compared with the nonlinear disturbance observer that requires calculation of the inverse of the inertia matrix. The acceleration signal of robotic joints is not used in the design of estimators. Moreover, we also show that the proposed estimators can be incorporated into the design of composite controllers to achieve satisfactory motion tracking response. The closed-loop control system stability and convergence of both the tracking error and estimation error are all guaranteed. Finally, the effectiveness of the two proposed methods is validated by using simulations and experiments based on a SCARA robot test-rig." @default.
• W2969389620 created "2019-08-29" @default.
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• W2969389620 date "2020-05-01" @default.
• W2969389620 modified "2023-10-17" @default.
• W2969389620 title "Unknown System Dynamics Estimator for Motion Control of Nonlinear Robotic Systems" @default.
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• W2969389620 doi "https://doi.org/10.1109/tie.2019.2920604" @default.
• W2969389620 hasPublicationYear "2020" @default.
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