Type Synthesis of Structural Symmetry One Degree-of-freedom of Helical Motion Parallel Mechanisms

doi:10.3901/JME.2019.03.027

Abstract

Abstract: The design scheme based on the parallel mechanism is proposed in view of the function demand of regenerative shock absorber motion transfer mechanisms. Based on the constraint screw theory, a type of synthesis approach for structure symmetrical one degree of freedom helical motion (1H) parallel mechanism is proposed. By using the screw theory, the method of decomposing the wrench into multiple forces in space is given. Based on that, the constraint wrench in the constraint screw system of the moving platform is decomposed into linearly independent constraint forces, and the number of these forces is equal to that of the limbs. Replacing the constraint wrench by these forces and constructing a new constraint screw system of the mechanism, after that the constraint screw system of the limbs is determined by using the screw theory and the spatial geometric theory, and the kinematic screw system of the limbs is obtained. Type synthesis of all the right limbs is accomplished by means of linear combination and equivalent substitution. Symmetrical arrangements limbs with the same structure along the moving platform and the fixed platform obtains a series of expected mechanisms. The degree of freedom analysis of a novel 3-UU parallel mechanism is performed and the result shows that the method of type synthesis for structural symmetry 1H parallel mechanisms proposed here is correct.

Key words: helical motion, motion transformation mechanism, parallel mechanism, type synthesis

CLC Number:

TH112

YANG Yandong, ZHEN Chunjiang, HOU Yulei, ZENG Daxing. Type Synthesis of Structural Symmetry One Degree-of-freedom of Helical Motion Parallel Mechanisms[J]. Journal of Mechanical Engineering, 2019, 55(3): 27-33.

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