The evaluation of absolute position drift of inertial-based motion capture systems

摘要

Inertial based capture technologies allow for direct capture of motions within a manufacturing environmentand, may be used with human simulation software to perform ergonomics analyses. However, thesetechnologies are negatively affected by metal environments where “drift” has been shown to cause error incapture accuracy. Twenty participants completed four multi-task events simulating real work, in alaboratory while instrumented with inertial and optical based motion capture systems. Participants beganand ended each event by performing a static T-Pose posture in a known location. Lower-leg 3D positiondata were extracted and the position difference from the start and end T-Poses were analyzed. Resultsindicate significant lower-leg position error relative to the starting location of the T-Pose to the end, withthe inertial systems as compared to the optical based system. These errors can impact overall accuracy andrepresentation of work within a human modeling environment.