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This paper proposes a dynamic modeling method of redundant drive spatial parallel mechanism, dynamics of 4-UPS-RPU redundant driving spatial parallel mechanism considering spherical joint clearance are analyzed. The dynamic equation of spherical joint clearance with Lagrange multiplier is built. The influences of single clearance and multiple clearances on dynamic responses of redundant drive spatial parallel mechanisms are analyzed under different clearance values. The results show that the dynamic characteristics of the mechanism with single clearance are basically consistent with the ideal situation, and the dynamic characteristics of the mechanism with multi-clearance are significantly different from the ideal situation.
This paper presents a novel model of snake-like robots based on a spatial linkage mechanism. The reasonable structural parameters of the mechanism are obtained by performing a kinematic simulation. Then the kinematics of the spatial linkage mechanism is developed and the motor angles of the robot for performing lateral undulation are analyzed based on the Serpenoid curve. The torque of servomotors at each moment is also obtained. The experiments detailed in this paper confirm that the robot is of the ability to realize several motion modes, including lateral undulation, left and right turning motions, and uplifting of the head.
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