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Fang Hairong
Fang Yuefa
Guo Sheng
School of Mechanical and Electronic
Control Engineering,
Beijing Jiaotong University,
Beijing 100044, China |
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STRUCTURE
SYNTHESIS OF 4-DOF PARALLEL ROBOT MECHANISMS BASED ON SCREW
THEORY*
Abstract: Structural synthesis for 4-DOF parallel manipulators using screw theory is systematically studied. Motion properties and constraint conditions of 4-DOF parallel manipulators according to the relationship between screw and reciprocal screw are analyzed. Mathematical expressions for constraint screws and twist screws of moving platform are constructed, and all possible limbs, which provide one or more force constraints, are enumerated. Finally, a parallel manipulator with 3-rotation-DOF and 1-translation-DOF is used as an example to describe the synthesis procedure for symmetrical and non-symmetrical 4-DOF parallel manipulators.
Key words:
Screw theory Robot Parallel mechanisms Structure synthesis
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