Supernumerary 3DOF Robotic ArmCreatek third-arm : Supernumerary robotic arm powered by magnetorheological clutches and an hydrostatic transmission. Fast enough to compensate for human motions while being safe for physical human-robot interaction. More information can be found in this paper : Catherine Véronneau, Jeff Denis, Louis-Philippe Lebel, Marc Denninger, Vincent Blanchard, Alexandre Girard, and Jean-Sébastien Plante, “Multifunctional Remotely Actuated 3-DOF Supernumerary Robotic Arm Based on Magnetorheological Clutches and Hydrostatic Transmission Lines”, 2020, Robotics and Automation Letters (RAL) and ICRA 2020, (pp. 2546-2553), DOI : 10.1109/LRA.2020.2967327 ABSTRACT : Supernumerary robotic limbs (SRL) are wearable extra limbs intended to help humans perform physical tasks beyond conventional capabilities in domestic and industrial applications. However, unique design challenges are associated with SRLs as they are mounted on the human body. SRLs must 1) be lightweight to avoid burdening the user, 2) be fast enough to compensate for human unpredictable motions, 3) be strong enough to accomplish a multitude of tasks, 4) have high force bandwidth and good backdrivability to control interaction forces between the user and the environment. This paper studies the potential of a remotely actuated 3-DOF supernumerary robotic arm equipped with a 3 fingers soft gripper, both powered by magnetorheological (MR) clutches and hydrostatic transmission lines. The tethered configuration allows the power-unit to be located on the ground, which minimizes the remote mass (4.2 kg) on the user. MR clutches minimize the actuation inertia in order to provide fast dynamics and good backdrivability. An experimental open-loop force-bandwidth of 18 Hz is obtained at each joint and the maximal speed reached by the device end-effector is 3.4 m/s, which is sufficient for compensating human motions. In addition, the two first joints provide 35 Nm and the third joint provides 29 Nm, which is strong enough to hold manual industrial tools. Finally, the SRL is put in real practical situations, as fruit and vegetables picking, painting, tools holding and badminton playing. The capability of the proposed MR-Hydrostatic SRL to perform successfully various tasks with high speed and smoothness suggests a strong potential of SRLs to become future commonly used devices.
A Seattle Neighborhood Battles the Covid CrisisCities are changing constantly. Old buildings get torn down, new ones go up. Businesses shutter, and other ones open. People move into neighborhoods and out. The Covid crisis, however, is causing a more profound change in urban environments. Office towers from Manhattan to San Francisco sit vacant. Public transit ridership has plummeted. Fine dining is now takeout.1
ITER NOW 1.11: The Big LiftWelcome to ITER NOW! The foundation of the ITER machine is the 1250 tonne stainless steel base of the enormous cryostat that will surround the tokamak providing the high vacuum, ultra cool environment needed to support the vacuum vessel and the superconducting magnets.The heaviest single component of the ITER machine, the cryostat base must be lifted over the sub-assembly tools in the Assembly Hall and lowered into the neighboring tokamak pit with absolute precision. Adhering to strict safety guidelines during the Covid-19 pandemic and maintaining a tight schedule leading up to the launch of assembly, failure for the ITER team today is not an option.
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Friday Night Owls: U.N. chief, Friday for Future activists call for bolder global climate actionNight Owls, a themed open thread, appears at Daily Kos seven days a week Jessica Corbett at Common Dreams writes— World Environment Day Provokes Warnings That 'To Care for Humanity, We Must Care ...