This paper proposes an intelligent compound disturbance rejection control framework integrating a novel Unknown System Dynamics Estimator (USDE) with Extreme Learning Machine (ELM). The USDE reconstructs the lumped term encompassing system parametric uncertainties and external disturbances online, requiring only real-time measurements of joint positions, velocities, and input torques, thereby eliminating dependency on a precise dynamic model. The framework further incorporates an ELM neural network to construct a disturbance rejection controller with direct joint torque actuation. Under randomly initialized ELM input weights, this architecture achieves effective prediction and compensation of acceleration errors through dynamic optimization of the output weights. Based on Lyapunov stability theory, the global stability of both the closed-loop tracking error and the USDE estimation error is rigorously proven. Simulations and experiments on a Franka Emika Panda robot demonstrate that the proposed method maintains high-precision trajectory tracking performance under simulated space disturbance scenarios, including unknown dynamic model mismatch, gravity variations, and sudden external disturbances. This work provides a theoretical framework and a universal implementation scheme, independent of precise dynamic models, for solving the challenge of fine manipulation control in harsh, unknown environments for open-space robotic systems.
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