Towards a Soft Fingertip with Integrated Sensing and Actuation

Soft material robots are attractive for safe interaction with humans and unstructured environments due to their compliance and low intrinsic stiffness and mass. These properties enable new capabilities such as the ability to conform to environmental geometry for tactile sensing and to undergo large shape changes for actuation. Due to the complex coupling between sensing and actuation in high-dimensional nonlinear soft systems, prior work in soft robotics has primarily focused on either sensing or actuation. This paper presents SOFTcell, a novel controllable stiffness tactile device that incorporates both optical sensing and pneumatic actuation. We report details on the device's design and implementation and analyze results from characterization experiments on sensitivity and performance, which show that SOFTcell can controllably increase its effective modulus from 4.4kPa to 46.1kPa. Additionally, we demonstrate the utility of SOFTcell for grasping in a reactive control task in which tactile data is used to detect fingertip shear as a grasped object slips, and cell pressurization is used to prevent the slip without the need to adjust fingertip position.

[1]  Ruzena Bajcsy,et al.  Active touch and robot perception , 1984 .

[2]  Jonathan Rossiter,et al.  Development of a tactile sensor based on biologically inspired edge encoding , 2009, 2009 International Conference on Advanced Robotics.

[3]  Sachin Chitta,et al.  Human-Inspired Robotic Grasp Control With Tactile Sensing , 2011, IEEE Transactions on Robotics.

[4]  Gaurav S. Sukhatme,et al.  Force estimation and slip detection/classification for grip control using a biomimetic tactile sensor , 2015, 2015 IEEE-RAS 15th International Conference on Humanoid Robots (Humanoids).

[5]  Arezki Boudaoud,et al.  The indentation of pressurized elastic shells: from polymeric capsules to yeast cells , 2012, Journal of The Royal Society Interface.

[6]  G. Whitesides,et al.  Pneumatic Networks for Soft Robotics that Actuate Rapidly , 2014 .

[7]  Lorenzo Marconi,et al.  Slip detection by tactile sensors: algorithms and experimental results , 1996, Proceedings of IEEE International Conference on Robotics and Automation.

[8]  Edward H. Adelson,et al.  Measurement of shear and slip with a GelSight tactile sensor , 2015, 2015 IEEE International Conference on Robotics and Automation (ICRA).

[9]  Roger W. Brockett,et al.  Reconstructing the Shape of a Deformable Membrane from Image Data , 2000, Int. J. Robotics Res..

[10]  R. S. Fearing,et al.  Tactile Sensing Mechanisms , 1990, Int. J. Robotics Res..

[11]  Roger W. Brockett,et al.  The performance of a deformable-membrane tactile sensor: basic results on geometrically-defined tasks , 2000, Proceedings 2000 ICRA. Millennium Conference. IEEE International Conference on Robotics and Automation. Symposia Proceedings (Cat. No.00CH37065).

[12]  Christopher R. Wagner,et al.  A compliant tactile display for teletaction , 2000, Proceedings 2000 ICRA. Millennium Conference. IEEE International Conference on Robotics and Automation. Symposia Proceedings (Cat. No.00CH37065).

[13]  Jim Euchner.  Design , 2014, Catalysis from A to Z.

[14]  Mark R. Cutkosky,et al.  Sensing skin acceleration for slip and texture perception , 1989, Proceedings, 1989 International Conference on Robotics and Automation.

[15]  J. Barbera,et al.  Contact mechanics , 1999 .

[16]  Christopher G. Atkeson,et al.  Implementing tactile behaviors using FingerVision , 2017, 2017 IEEE-RAS 17th International Conference on Humanoid Robotics (Humanoids).

[17]  Filip Ilievski,et al.  Soft robotics for chemists. , 2011, Angewandte Chemie.

[18]  Kaspar Althoefer,et al.  Variable Stiffness Link (VSL): Toward inherently safe robotic manipulators , 2017, 2017 IEEE International Conference on Robotics and Automation (ICRA).

[19]  Robert D. Howe,et al.  A tactile sensor for localizing transient events in manipulation , 1994, Proceedings of the 1994 IEEE International Conference on Robotics and Automation.

[20]  Nathan F. Lepora,et al.  Tactile manipulation with biomimetic active touch , 2016, 2016 IEEE International Conference on Robotics and Automation (ICRA).

[21]  Dario Floreano,et al.  Contactless deflection sensor for soft robots , 2011, 2011 IEEE/RSJ International Conference on Intelligent Robots and Systems.

[22]  Ja Choon Koo,et al.  Artificial annelid robot driven by soft actuators , 2007, Bioinspiration & biomimetics.

[23]  Robert J. Wood,et al.  Soft robotic glove for combined assistance and at-home rehabilitation , 2015, Robotics Auton. Syst..

[24]  Claudio Melchiorri,et al.  Slip detection and control using tactile and force sensors , 2000 .

[25]  D. Rus,et al.  Design, fabrication and control of soft robots , 2015, Nature.

[26]  Shashank Priya,et al.  A biomimetic robotic jellyfish (Robojelly) actuated by shape memory alloy composite actuators , 2011, Bioinspiration & biomimetics.

[27]  Robert J. Wood,et al.  A Resilient, Untethered Soft Robot , 2014 .

[28]  Jonathan Rossiter,et al.  WormTIP: An Invertebrate Inspired Active Tactile Imaging Pneumostat , 2015, Living Machines.

[29]  Stefan Begej,et al.  Planar and finger-shaped optical tactile sensors for robotic applications , 1988, IEEE J. Robotics Autom..

[30]  Sanlin S. Robinson,et al.  Highly stretchable electroluminescent skin for optical signaling and tactile sensing , 2016, Science.

[31]  LuNanshu,et al.  Flexible and Stretchable Electronics Paving the Way for Soft Robotics , 2014 .

[32]  Gordon Cheng,et al.  Tactile-based manipulation of deformable objects with dynamic center of mass , 2016, 2016 IEEE-RAS 16th International Conference on Humanoid Robots (Humanoids).

[33]  Nanshu Lu,et al.  Flexible and Stretchable Electronics Paving the Way for Soft Robotics , 2013 .

[34]  Fumiya Iida,et al.  Deformation in Soft-Matter Robotics: A Categorization and Quantitative Characterization , 2015, IEEE Robotics & Automation Magazine.

[35]  Ruzena Bajcsy,et al.  Active Exploration of Surfaces for Legged Locomotion of Robots , 1990 .

[36]  Paolo Dario,et al.  Soft Robot Arm Inspired by the Octopus , 2012, Adv. Robotics.