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Implant loosening and bearing surface wear remain the most common failure problems of total ankle arthroplasty (TAA). One of the main factors leading to these problems is the nonphysiologic design of articular surfaces. The goals of this study were to reveal the effects of the anatomical medial‐lateral borders height differences, coronal and sagittal radii on the joint kinematics, contact mechanics,...
Load capacity of a spatial rotation 4-SPS-S parallel manipulator has been studied in this paper. The 4-SPS-S parallel manipulator has spatial three pure rotation degrees of freedom, including four SPS active legs and one passive constraining leg, which can be used as heavy-loading vehicle kinematic simulation devices, precise positioning mechanism of tunnel erecter assembly robots in tunnel shield...
This paper proposes an innovative design for a parallel manipulator that can be applied to a machine tool. The proposed 3-SPS-1-S parallel manipulator has three pure rotation degrees of freedom, including three SPS Active Legs and one passive constraining leg. The passive leg is introduced into this new parallel manipulator in order to increase the stiffness of the system and eliminate any unexpected...
This paper proposes a new parallel manipulator with three purely rotational degrees of freedom, which consists of four SPS active legs and one passive constraining leg. The passive leg is introduced into this new parallel manipulator in to increase load capacity, stiffness and reliability of the structure, and to eliminate any redundant motion. Kinematic analysis of the manipulator is presented, including...
In this paper, a new 6-DOF serial and parallel manipulator with a 3-rotation parallel mechanism and a 3-DOF serial manipulator (two-prismatic plus one-revolute) is synthesized and investigated according to the theories of the structure synthesis of robot mechanisms. It is able to perform spatial transformational movement, rotation, hoisting, tilting, planar rotation and tilted rotation. The mechanism...
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