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This paper studies the problem of robust output feedback control for a class of upper-limb rehabilitation robot, which can assist with shoulder, elbow and wrist joint movements. The proposed controller can guarantee the robustness of the robotic system in the presence of model uncertainties, as well as the ultimate boundedness of the presented adaptive observer-based controller. An obvious advantage...
In the face of large scale parametric uncertainties, the existing single model (SM)-based sliding mode control (SMC) demands high controller gains to achieve good transient tracking performance. The main practical problem of having high-gains based design is that it amplifies the input and output disturbance as well as excites hidden unmodeled dynamics causing high-frequency switching and infinitely...
Control of underactuated manipulators is an attractive research theme in robotics. One of the reasons is that they become a complex system, so that they cannot be controlled by normal any control methods. These systems also include the properties of nonholonomic systems. One of control methods used for underactuated manipulators is known as a switching control, which selects a stable controller out...
This paper proposes a novel method for planning point-to-point robot trajectories. With the new method, the requirement of an optimal path and the need of a slim motion due to the lack of free space can be compromised. The generated slim motion is suitable for applications where human-robot cooperation takes place. The new method is based on the synchronized links motion with a constant ratio of the...
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