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1

Control Systems Group Fachgebiet Regelungssysteme, Technische Universität Berlin, 10623 Berlin, Germany

2

Systems and Control Theory Group, Max Planck Institute for Dynamics of Complex Technical Systems, 39106 Magdeburg, Germany





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Abstract This contribution is concerned with joint angle calculation based on inertial measurement data in the context of human motion analysis. Unlike most robotic devices, the human body lacks even surfaces and right angles. Therefore, we focus on methods that avoid assuming certain orientations in which the sensors are mounted with respect to the body segments. After a review of available methods that may cope with this challenge, we present a set of new methods for: 1 joint axis and position identification; and 2 flexion-extension joint angle measurement. In particular, we propose methods that use only gyroscopes and accelerometers and, therefore, do not rely on a homogeneous magnetic field. We provide results from gait trials of a transfemoral amputee in which we compare the inertial measurement unit IMU-based methods to an optical 3D motion capture system. Unlike most authors, we place the optical markers on anatomical landmarks instead of attaching them to the IMUs. Root mean square errors of the knee flexion-extension angles are found to be less than 1° on the prosthesis and about 3° on the human leg. For the plantar-dorsiflexion of the ankle, both deviations are about 1°. View Full-Text

Keywords: inertial measurement units; gait analysis; gyroscopes and accelerometers; avoid magnetometers; exploit kinematic constraints; sensor-to-segment mounting; joint axis and position identification; joint angle measurement; validation against optical gait analysis; validation on prosthetic and human leg inertial measurement units; gait analysis; gyroscopes and accelerometers; avoid magnetometers; exploit kinematic constraints; sensor-to-segment mounting; joint axis and position identification; joint angle measurement; validation against optical gait analysis; validation on prosthetic and human leg





Author: Thomas Seel 1,* , Jörg Raisch 1,2 and Thomas Schauer 1

Source: http://mdpi.com/



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