Integration of Robotic Tracking/Measuring-machining Applying the Closed and Smooth Properties of Lie Groups: I System Calibration and Path Generation

doi:10.3901/JME.2025.20.001

Abstract

Abstract: The aircraft skin is the primary component forming the aerodynamic shape of an aircraft, characterized by large size, thin wall (thickness 2～6 mm) and complex structure. Currently, manufacturers generally adopt a manual comparison-marking-trimming method to remove the edge allowance of the skin parts, leading to large cumulative human errors and difficulties in controlling assembly quality. Vision/force-guided industrial robot milling with high-flexibility and large operation range provides a novel approach to solving these problems. However, difficulties in simultaneous calibration of dual-robot systems, smooth path generation for machining and accurate control of the robot’s trajectory have become the bottlenecks restricting the application of robot milling for the aircraft skin. The above challenges can be summarized as the simultaneous decoupling of spatial transformation and the quantitative control of pose errors. To address these issues, this paper conducts in-depth research on dual-robot system calibration, smoothing machining path generation and closed-loop feedback control of the robot’s end-effector. The Part I proposes simultaneous calibration method of dual-robot system for robotic tracking/measuring-machining, establishes kinematics model of robot-tracking system and studies method to generate a smooth machining path for aircraft skin. The Part II studies closed-loop feedback control model for robot’s end-effector under external tracking system, develops closed-loop feedback control system for robot. The simultaneous calibration accuracy test of dual-robot, the trajectory accuracy test of end pose with closed-loop control, and the robotics milling accuracy test of typical skin samples are carried out to validate the effectiveness of the proposed methods.

Key words: integration of tracking/measuring and machining, lie group and lie algebra, closed and smooth property, pose simultaneous calibration, milling path generation

CLC Number:

TH161

LI Wenlong, JIANG Cheng, XU Wei, DING Han. Integration of Robotic Tracking/Measuring-machining Applying the Closed and Smooth Properties of Lie Groups: I System Calibration and Path Generation[J]. Journal of Mechanical Engineering, 2025, 61(20): 1-15.

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