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Variable stiffness actuation (VSA) devices are being used to jointly address the issues of safety and performance in physical human-robot interaction. With reference to the VSA-II prototype, we present a feedback linearization approach that allows the simultaneous decoupling and accurate tracking of motion and stiffness reference profiles. The operative condition that avoids control singularities...
In this article a novel concept for specification of spatial paths for mechanism and kinematic design applications is presented. Mechanism designers use e.g. sketches for specification of motion curves. If these are created based on oral description, misunderstanding or inadequate formulation are sources of error. Further, it is difficult to generate them for spatial problems. The presented approach...
In this study, we proposed the collision observer for real-time detection of collisions between service robot and unknown obstacle. In case of a mobile equipped extra manipulator such as a service robot the safety of the system in service field is very important because a collision between the manipulator and a person may damages against the one. Therefore it is required to detect the collision against...
In the framework of physical human-robot interaction (pHRI), methodologies and experimental tests are presented for the problem of detecting and reacting to collisions between a robot manipulator and a human being. Using a lightweight robot that was especially designed for interactive and cooperative tasks, we show how reactive control strategies can significantly contribute to ensuring safety to...
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