Online Archive of University of Virginia Scholarship
Motion Tracking of Highly Dynamic Multi-Link Systems in Unconstrained Space118 views
Author
Cox, Jeronimo, Mechanical and Aerospace Engineering - School of Engineering and Applied Science, University of Virginia0000-0001-8595-4652
Advisors
Furukawa, Tomonari, EN-Mech & Aero Engr Dept, University of Virginia
Kent, Richard, EN-Mech & Aero Engr Dept, University of Virginia
Russell, Shawn, MD-ORTP Ortho Research, University of Virginia
Abstract
This thesis presents a motion tracking methodology for highly-dynamic, multi-link systems unconstrained by space due to visual obstruction or magnetic distortion. The proposed technique of dynamic measurement fusion changes the role of the accelerometer from correcting inclination with the gravity vector only in quasi-static motion, to measuring centrifugal forces of links. This allows measuring angular rate of links not only with gyroscopes embedded to \gls{imu}s, but also accelerometers, making more use of the inertial sensors. Headings of links are corrected with magnetometers. As local distortion is inconsistent at every position in some space, a method is proposed to measure local hard iron distortion, allowing heading correction to be more effective in nonuniform magnetic fields. In validating the techniques using an experimentally induced two degree of freedom motion, error in estimated state has improved by half an order of magnitude. While the methods have worked to track highly dynamic humanoid motion, the proposed technique has difficulty estimating quasi-static 3D motions.
Cox, Jeronimo. Motion Tracking of Highly Dynamic Multi-Link Systems in Unconstrained Space. University of Virginia, Mechanical and Aerospace Engineering - School of Engineering and Applied Science, MS (Master of Science), 2023-06-05, https://doi.org/10.18130/68fe-nc69.
