THE INFLUENCE OF NOISE IN ANGULAR KINEMATICS ON THE TRANSFORMATION OF LINEAR ACCELERATION BETWEEN ACCELEROMETER COORDINATE FRAMES

Authors

Erwan Izri, Swansea UniversityFollow
Neil Bezodis, Swansea UniversityFollow
Mark Waldron, Swansea UniversityFollow
Chris Jones, Sports and Wellbeing Analytics Limited and University College LondonFollow
Liam Kilduff, Swansea UniversityFollow
Rowan Brown, Swansea UniversityFollow

Category

Wearable Technology

Document Type

Paper

Abstract

Linear accelerations measured by instrumented mouthguards (iMG) are transformed to a common reference frame. To investigate the influence of signal noise on this transformation using ground truth measurements, this study transformed linear accelerations measured by an Anthropomorphic Test Device (ATD) to the iMG frame. Noise was incrementally added to ATD angular velocity signals across 81 impacts. Agreement was quantified between ATD ground truth versus noisy angular velocity, angular acceleration and transformed linear acceleration signals. Angular velocity noise as low as 0.265 rad/s led to errors exceeding 10%, highlighting the transform’s sensitivity to angular kinematics. The findings highlight potential difficulties in accurately interpreting noisy iMG data, stressing the necessity for precise processing techniques to ensure reliable biomechanical analysis.

Recommended Citation

Izri, Erwan; Bezodis, Neil; Waldron, Mark; Jones, Chris; Kilduff, Liam; and Brown, Rowan (2024) "THE INFLUENCE OF NOISE IN ANGULAR KINEMATICS ON THE TRANSFORMATION OF LINEAR ACCELERATION BETWEEN ACCELEROMETER COORDINATE FRAMES," ISBS Proceedings Archive: Vol. 42: Iss. 1, Article 190.
Available at: https://commons.nmu.edu/isbs/vol42/iss1/190