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• W1984455387 startingPage "46" @default.
• W1984455387 abstract "Purpose Recent research has considered robotic machining as a dextrous alternative to traditional CNC machine tools for complex sculptured surfaces. One challenge in using robotic machining is that the stiffness is lower than traditional machine tools, due to the cantilever design of the links and low‐torsional stiffness of the actuators. This paper seeks to examine this limitation, using optimization algorithms to determine the best trajectories for the manipulators such that the stiffness is maximized. Design/methodology/approach The issue of low stiffness is addressed with an integrated off‐line planner and real‐time re‐planner. The available manipulator stiffness is maximized during off‐line planning through a trajectory resolution method that exploits the nullspace of the robot machining system. In response to unmodeled disturbances, a real‐time trajectory re‐planner utilizes a time‐scaling method to reduce the tool speed, thereby reducing the demand on the actuator torques, increasing the robot's dynamic stiffness capabilities. During real‐time re‐planning, priorities are assigned to conflicting performance criteria such as stiffness, collision avoidance, and joint limits. Findings The algorithms developed were able to generate trajectories with stiffer configurations, which resulted in a reduction in the actuator torques. The real‐time re‐planner successfully allowed the process plan to continue when disturbances were encountered. Research limitations/implications Simulations are presented to demonstrate the effectiveness of the approach. Practical implications Addressing the limitation of stiffness in serial‐link manipulators will enable robots to become more suitable for machining tasks. The real‐time re‐planning approach will allow robots to become more autonomous during the execution of a given task. Originality/value An integrated off‐line and real‐time planning approach has been applied to robotic machining." @default.
• W1984455387 created "2016-06-24" @default.
• W1984455387 creator A5010515295 @default.
• W1984455387 creator A5023892255 @default.
• W1984455387 creator A5035882135 @default.
• W1984455387 date "2008-01-11" @default.
• W1984455387 modified "2023-09-27" @default.
• W1984455387 title "Stiffness optimization for two‐armed robotic sculpting" @default.
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• W1984455387 doi "https://doi.org/10.1108/01439910810843289" @default.
• W1984455387 hasPublicationYear "2008" @default.
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