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This paper presents a comparative study of the fully actuated 3-RRR mechanism and the redundantly actuated 4-RRR mechanism. The joint clearances are taken into consideration in both kinematic and dynamic analysis of the two mechanisms. In the kinematic analysis, the joint clearance is treated as a mass-less virtual link, and the error transfer equations of these mechanisms are obtained by the first...
This paper presents the design, analysis and test of a novel planar 3-DOF (degree of freedom) precision positioning platform. Three two-level lever amplifiers are utilized to get a large amplification ratio. A more accurate flexible bending model of the lever amplifier is created to calculate the displacement loss relative to the PRBM (pseudo-rigid-body model). The displacement loss factor, the drift...
W-Climbot is an inchworm-like biped wall-climbing robot we developed with a modular approach. Consisting of five joint modules and two suction modules, the robot is actually a mobile 5-DoF arm with dual end-effectors at the two ends. With this kinematic structure and biped climbing mode, W-Climbot has superior wall-climbing function (e.g., great ability to omni-directional locomotion, to negotiate...
High-rise tasks in agriculture, forestry and building industry requires robots possessing climbing function. Motivated by these potential applications and inspired by the climbing motion of animals such as inchworms, we have developed a novel biped climbing robot - Climbot. Built with a modular approach, the robot consists of five 1-DoF joint modules connected in series and two special grippers mounted...
Inspired by the motion patterns of inchworms, a miniature biped climbing robot is developed with modularization method for some tedious and dangerous high-rise tasks. This inchworm-like mini-robot consists of several modules including I-typed joint modules, T-typed joint modules, and gripper modules, which are all driven by small RC servo motors. In this paper, the development of the robot prototype...
In this paper, we propose a numerical approach to generate the workspace of a multifingered robotic hand manipulating an object in the 3-D case. Based on feasibility analysis of grasps, the proposed approach uses a numerical optimization technique to first compute discretely the boundary of the possible motion of the grasped object, and then the limits of rotation about various axes at a specified...
The knowledge of the workspace of a robotic multifingered hand is crucial in order to plan grasp and dexterous manipulation, as in the cases of other robotic systems. In this paper, we propose a numerical approach to compute and visualize the workspace of a multifingered robotic hand manipulating an object in the planar case. Based on feasibility analysis of grasps, the proposed approach uses a numerical...
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