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3D motion tracking for skin deflection, strain and stress analysis

3D motion tracking for skin deflection, strain and stress analysis. Delp Motion lab in Clark Center. Reflective markers (70 total) on arm and skin stretch applicator. Field of view as seen by cameras (red circles show where the applicators would make contact).

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3D motion tracking for skin deflection, strain and stress analysis

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  1. 3D motion tracking for skindeflection, strain and stress analysis Delp Motion lab in Clark Center

  2. Reflective markers (70 total)on arm and skin stretch applicator

  3. Field of view as seen bycameras (red circles show wherethe applicators would make contact)

  4. Torque versus rotational displacement. Green curves are forskin stretch devicewith fixed contacts; blue is for freelyspinning contacts.As expected, fixedcase requires higher torques,corresponding tosomewhat higherperceived rotation(and somewhatless comfort at high rotations).

  5. Average displacement of markers Now BLUE curves arefor fixed contacts; GREEN is for freelyspinning contacts (sorry)… As expected, theaverage markerdisplacements aregreater for the fixedcontact case, correlating with theincrease in torque.

  6. Surface plot showing local variationsin displacement (at 10 degrees of rotation)

  7. Strain energy GREEN curves arefor fixed contacts; BLUE is for freelyspinning contacts. As expected, theoverall strainenergy correlateswith theincrease in torqueand skin displacement(work). Fixed contacts alsoshow local regionsof higher strainenergy near the contacts.

  8. Update: KAUST project(Jason Wheeler) • Getting ready to do realtime feedback for motion training application (e.g., ACL injury) with Prof. Thor Besier • Currently doing software integration: motion capture  motion processing and estimation of tendon forces, motions  feedback via skin stretch.

  9. Novint (Cutkosky, Salisbury) • NOVINT Inc. (makers of the Novint Falcon haptic feedback device, which is inspired by the Force Dimension Omega) have contacted us about possible designs for a 6 DOF version with 3 DOF wrist. • Meeting will be Dec. 15.

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