Type Synthesis of 4-DOF Non-Overconstrained Parallel Mechanisms with Symmetrical Structures
Wei Ye, Qinchuan Li, Xinxue Chai
Abstract
This paper presents the type synthesis of 4-DOF non-overconstrained parallel mechanisms (PMs) with symmetrical structures. A special topological structure that includes two intermediate platforms and one moving platform is employed. Constraint conditions for 3R1T, 2R2T, and 1R3T (R: rotation; T: translation) symmetrical PMs are analyzed. Several classes of hybrid limbs that exert a constraint force or a constraint couple are synthesized using screw theory. These limbs are then used to construct 4-DOF PMs, resulting in many novel non-overconstrained 3R1T, 2R2T, and 1R3T PMs with symmetrical structures. The non-overconstrained feature is verified based on the Grübler/Kutzbach criterion.
Topics & Concepts
Constraint (computer-aided design)Translation (biology)Topology (electrical circuits)Screw theoryConstruct (python library)Type (biology)Rotation (mathematics)Feature (linguistics)Computer scienceMathematicsAlgorithmGeometryArtificial intelligenceCombinatoricsRobotPhilosophyBiochemistryMessenger RNAChemistryProgramming languageLinguisticsBiologyEcologyGeneRobotic Mechanisms and DynamicsPiezoelectric Actuators and ControlAdvanced Surface Polishing Techniques