Actuation Requirements for Assistive Exoskeletons: Exploiting Knowledge of Task Dynamics

When selecting actuators for assistive exoskeletons, designers face contrasting requirements. Overdimensioned actuators have drawbacks that compromise their effectiveness in the target application (e.g. performance, weight, comfort). In some cases, the requirements on the powered actuator can be relaxed exploiting the contribution of an elastic element acting in mechanical parallel. This contribution considers one such case and describes an approach to fit the actuation requirements closely to the task dynamics, thereby mitigating the drawbacks of overdimensioned actuators.

[1]  Lorenzo Grazi,et al.  A Real-Time Lift Detection Strategy for a Hip Exoskeleton , 2018, Front. Neurorobot..

[2]  Richard J. Duro,et al.  Open-Ended Learning: A Conceptual Framework Based on Representational Redescription , 2018, Front. Neurorobot..

[3]  H M Toussaint,et al.  The evaluation of a practical biomechanical model estimating lumbar moments in occupational activities. , 1994, Ergonomics.

[4]  M. Tomizuka,et al.  A Compact Rotary Series Elastic Actuator for Human Assistive Systems , 2012, IEEE/ASME Transactions on Mechatronics.

[5]  Darwin G. Caldwell,et al.  Energy Efficiency Analysis and Design Optimization of an Actuation System in a Soft Modular Lower Limb Exoskeleton , 2018, IEEE Robotics and Automation Letters.

[6]  Joost Geeroms,et al.  Optimizing the power and energy consumption of powered prosthetic ankles with series and parallel elasticity , 2017 .

[7]  Bram Vanderborght,et al.  Series and Parallel Elastic Actuation: Influence of Operating Positions on Design and Control , 2017, IEEE/ASME Transactions on Mechatronics.

[8]  Dirk Lefeber,et al.  Modeling and design of geared DC motors for energy efficiency: Comparison between theory and experiments , 2015 .

[9]  Darwin G. Caldwell,et al.  Rationale, Implementation and Evaluation of Assistive Strategies for an Active Back-Support Exoskeleton , 2018, Front. Robot. AI.

[10]  Joost Geeroms,et al.  Reduction of the torque requirements of an active ankle prosthesis using a parallel spring , 2017, Robotics Auton. Syst..

[11]  Paolo Fiorini,et al.  A Parallel-Elastic Actuator for a Torque-Controlled Back-Support Exoskeleton , 2018, IEEE Robotics and Automation Letters.

[12]  Darwin G. Caldwell,et al.  A wearable device for reducing spinal loads during lifting tasks: Biomechanics and design concepts , 2015, 2015 IEEE International Conference on Robotics and Biomimetics (ROBIO).