This paper describes a new parallel kinematic architecture for machining applications, namely, the orthoglide. This machine features three fixed parallel linear joints which are mounted orthogonally and a mobile platform which moves in the Cartesian x-y-z space with fixed orientation. The main interest of the orthoglide is that it takes benefit from the advantages of the popular PPP serial mach...

Although many daily tasks tend to destabilize arm posture, it is still possible to have stable interactions with the environment by regulating the multijoint mechanics of the arm in a task-appropriate manner. For postural tasks, this regulation involves the appropriate control of endpoint stiffness, which represents the stiffness of the arm at the hand. Although experimental studies have been u...

In this article, the workspace of planar wire-actuated parallel manipulators is studied. The investigation is based on two methods: an analytical method which formulates the workspace envelope by means of Cramer’s rule pertaining to the Jacobian matrix and the null space method from static analysis of manipulator. The workspace envelope method is extended to analyzing redundant planar manipulat...

In this work, a new constrained numerical optimization approach is proposed for solving offline the Inverse Kinematics Problem (IKP) of articulated robots, which consists on optimizing joint displacement while end effector positioned and oriented in desired pose. The novelty formulation problem, where objective function calculates minimum displacement, with position orientation errors handled a...

Abstract Cable-driven parallel robots (CDPRs) offer high payload capacities, large translational workspace, and dynamics performances. Their rotational workspace is generally far more limited, however, which can be resolved using cable loops, as was shown in previous research. In the case of fully constrained CDPRs, loops induce unwanted torques on moving-platform (MP), causing it to tilt move ...

This paper deals with an up-to-date topic among robotic industrial applications that require a high degree of speed, rigidity, and orientation. Currently, when technology software reach level performance, in various start from certain concepts, the implementation efficient structures has proven to be challenging. New such as parallel kinematic machine (PKM) category its efficiency through struc...

Two methods for determining dexterity of manipulator arms are presented. A numerical method is illustrated for determining all possible orientations of the end-effector of an open kinematic chain based upon a row-rank deficiency of the sub-Jacobian of the kinematic constraint equations. This numerical method has been adapted from a theory for determining the accessible output set for planar and...