Various performance indices are used for the design of serial manipulators. One method of optimization relies on the condition number of the Jacobian matrix. The minimization of the condition number leads, under certain conditions, to isotropic configurations, for which the roundoff-error amplification is lowest. In this paper, the isotropy conditions, introduced elsewhere, are the motivation b...

In this paper, we study the isotropic design of two types of spatial parallel manipulators: a three-degrees-of-freedom manipulator and the Stewart–Gough platform. The isotropic conditions for Jacobian matrices, which relate the input joint velocity and output Cartesian velocity, are determined separately using a pure symbolic method. Thereafter, upon determining the isotropic conditions for bot...

Abstract: This paper presents a performance metric for the manipulability of constrained serial manipulators. The manipulability measure and manipulability ellipsoid are found from the manipulability Jacobian, which is easily found for serial manipulators as the standard Jacobian matrix, or for parallel manipulators as the Jacobian that gives the mapping from the active joint velocities to the ...

This article synthezises the most important results on the kinematics of cuspidal manipulators i.e. nonredundant manipulators that can change posture without meeting a singularity. The characteristic surfaces, the uniqueness domains and the regions of feasible paths in the workspace are defined. Then, several sufficient geometric conditions for a manipulator to be noncuspidal are enumerated and...

c 1996 IEEE Minneapolis, MN, 1996 Motion Planning for Multiple Mobile Manipulators Jaydev Desai, Chau-Chang Wang, Milo s Zefran and Vijay Kumar General Robotics and Active Sensory Perception (GRASP) Laboratory, University of Pennsylvania 3401 Walnut Street, Room 301C, Philadelphia, PA 19104-6228 Abstract We address the motion planning for \ xtureless" material-handling with multiple manipulator...

This paper traces the development of teleoperators and associated control technology leading to the development of remote manipulators for medical application . The implications of various design approaches are elaborated in a general review of the UCLA Biotechnology Laboratory's preliminary evaluation of medical manipulators. The manipulators were made available through the auspices of the Vet...

Self-reconfiguration of robotic manipulators under joint failure can be achieved via fault-tolerance strategies. Faulttolerant manipulators are required to continue their endeffector motion with a minimum velocity jump, when failures occur to their joints. Optimal fault tolerance of the manipulators requires a framework that can map the velocity jump of the end-effector to the compensating join...

There are several ubiquitous kinematic structures that used in industrial robots, with the most prominent being a six-axis angular structure. However, researchers experimenting task-based mechanism synthesis could provide higher efficiency custom optimized manipulators. Many studies have focused on finding efficient optimization algorithm for robot These manipulators, however, usually from simp...

This work investigates new kinematic features of parallel manipulators. It is well known that parallel manipulators admit generally several direct kinematic solutions for a given set of input joint values. The aim of this paper is to characterize the uniqueness domains in the workspace of parallel manipulators, as well as their image in the joint space. The study focuses on the most usual case ...

This paper considers finite-time position control of robot manipulators. The robot manipulators are modeled by discontinuous differential equations. In this paper, we prove that the Nakamura’s local homogeneous controller based on a control Lyapunov function is valid to the position control of the robot manipulators, and show the effectiveness of the controller by experiments. Moreover, we comp...