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Journal misalignment often exists in grease lubricated journal bearings. Lubricating grease is a non-Newtonian liquid, and the rheological properties of grease make it difficult to analyze the lubrication performance numerically. In this paper, grease lubrication Reynolds equation is introduced based on the Herschel-Bulkley model which accurately describes the rheological properties of grease. The...
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...
The driving system of cutter head is the key part of shield machine, it is also a technological bottleneck in the design and production of tunneling shield currently in China. This paper combines reliability design and optimization design to produce a reliability optimization scheme of main driving gear transmission of shield machine. It uses Kriging model for approximation and Bayesian analysis algorithm...
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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