Exonetik Inc.

Published purpose

Actuators transform electrical energy into mechanical energy to move and control mobile devices. Magnetorheological (MR) actuation is a unique technology with exceptional dynamic performance thanks to the MR fluid's viscosity that increases when exposed to a magnetic field, almost to the point of becoming solid. Actuators using MR fluids present characteristics making them very interesting for use in space compared to other types of actuators: increased performance, lower mass and more safety when used for applications involving human-robot interactions. Exonetik proposes to study the feasibility of using MR actuators in inhabited space environments for future space missions. More specifically, the work will consist in assessing the most critical risks of using MR actuators in space environments: launch vibrations, in-use outgassing, and safety of use. The biggest technological unknown lies around outgassing. Conventional off-the-shelf MR fluids use hydrocarbon-based oils and are known to outgas significantly in some operating conditions. The working hypothesis is that a custom formulation designed specifically for low outgassing, and involving perfluoropolyether (PFPE), would perform well in a space environment.