Title :
Errors Analysis of 3-UPU Parallel Manipulator Using Screw Theory
Author :
Bi, Jianping ; Wen, Rui
Author_Institution :
Dept. of Mech. & Eng., Henan Inst. of Eng., Zhengzhou, China
Abstract :
From perspective of structure synthesis, certain special geometric constraints, such as joint axes intersecting at one point or parallel to each other, are necessary in realizing the end-effector motion. These requirements are difficult to achieve in the actual system due to assembly errors and manufacturing tolerances. If the conditions aren´t satisfied, the motion characteristics of the 3-UPU parallel manipulator may no longer exist. Therefore, identification and prevention of these constraint errors in initial design and manufacturing stage are of great significance. A method based on screw theory is proposed to perform mobility analysis of a 3-UPU manipulator with three translational degrees. In order to evaluate the effects of the errors on the platform accuracy, the inverse and forward kinematics problems of the actual platform model are solved. The simulation results provide insight to the expected accuracy and indicate the major factors contributing to inaccuracies.
Keywords :
end effectors; error analysis; manipulator kinematics; mobile robots; robotic assembly; 3-UPU parallel manipulator; assembly errors; end-effector motion; errors analysis; forward kinematics problem; geometric constraints; inverse kinematics problem; joint axes; manufacturing tolerances; mobility analysis; screw theory; structure synthesis; Error analysis; Fasteners; Kinematics; Manipulators; Manufacturing; Mechanical variables measurement; Medical robotics; Motion measurement; Parallel robots; Robotic assembly;
Conference_Titel :
Measuring Technology and Mechatronics Automation (ICMTMA), 2010 International Conference on
Conference_Location :
Changsha City
Print_ISBN :
978-1-4244-5001-5
Electronic_ISBN :
978-1-4244-5739-7
DOI :
10.1109/ICMTMA.2010.438
