Joint angle estimation with accelerometers for dynamic postural analysis.
This paper presents a new accelerometer based method for estimating the posture of a subject standing on a dynamic perturbation platform. The induced perturbation is used to study the control mechanisms as well as the balance requirements that regulate the upright standing. These perturbations are translated into different intensity levels of speed and acceleration along longitudinal and lateral directions of motion. In our method, the human posture is modeled by a tridimensional, three-segment inverted pendulum which simultaneously takes into account both the anterior-posterior and medio-lateral strategies of hip and ankle. Four tri-axial accelerometers are used her, one accelerometer is placed on the platform, and the other three are attached to a human subject. Based on the results, the joint angle estimated compare closely to measurements from magnetic encoders placed on an articulated arm joint. The results were also comparable to those found when using a high-end optical motion capture system coupled with advanced biomechanical simulation software. This paper presents the comparisons of our accelerometer-based method with encoder and optical marker based method of the estimated joint angles under different dynamics perturbations.
Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7222, ISIR, F-75005 Paris, France. Electronic address: jianting.ma@assistmov.com.
Jianting
J
Ma
Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7222, ISIR, F-75005 Paris, France. Electronic address: haissam.kharboutly@assistmov.com.
Haissam
H
Kharboutly
INSA Centre Val de Loire, Campus de Bourges, Univ. Orléans, PRISME, EA 4229, 88, Boulevard Lahitolle, 18020 Bourges, France. Electronic address: abderraouf.benali@insa-cvl.fr.
Abderraouf
A
Benali
Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7222, ISIR, F-75005 Paris, France. Electronic address: amar@isir.upmc.fr.
Faïz
F
Benamar
Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7222, ISIR, F-75005 Paris, France. Electronic address: mourad.bouzit@assistmov.com.
Mourad
M
Bouzit
D061725:Accelerometry; D000465:Algorithms; D000843:Ankle Joint / Q000502:physiology*; D001696:Biomechanical Phenomena; D006621:Hip Joint / Q000502:physiology*; D006801:Humans; D007719:Knee Joint / Q000502:physiology*; D008953:Models, Anatomic; D004856:Postural Balance; D011187:Posture; D012044:Regression Analysis
Inverted pendulum; Joint estimation; Omnidirectional mobile platform.; Postural disturbance; Tri-axial accelerometer