Purpose -The aim of this paper is to present new robotic structures that can be suitable for inspection, maintenance and dismantling tasks in nuclear facilities. Design/methodology/approach -In the first part, two types of parallel robots capable to climb through structures are presented. The kinematics of the proposed platforms is reviewed, with emphasis on the analysis of the singularities. Next section shows the control architecture and the hardware setup of the developed system. Finally, the prototypes developed are showed and some conclusions are obtained. Findings -The slave robot is a parallel structure with the ability to climb over structures and with a very high load capacity. The master device is a parallel device with special characteristics that makes easier the teleoperation of the parallel slave robot. Originality/value -The paper presents a teleoperation system based on parallel platform with 6 degrees of freedom to overcome the classical difficulties of teleoperation in nuclear facilities.
SUMMARYThis paper presents a simple methodology for the quantitative and qualitative analysis of the performance of spherical parallel platforms. The quaternion formulation is used to represent the possible rotations, showing the workspace as a three-dimensional (3-D) solid object. The singularities of the platform intersect graphically with its workspace, allowing a graphical study of the mechanism kinematics. The performance criterion considered here has been the local dexterity of the manipulator. This methodology has been used to study and analyze three known orientation parallel platforms: 3-RRR, 3-UPU-wrist, and 2-UPS-1-RU. The objective of this study is to analyze the ability of these platforms to be utilized as mechanisms for the neck and shoulders of humanoid robots. Finally, the forces on actuators in some typical motions for neck and shoulder are plotted.
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