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Estimation of trunk mechanical properties using system identification: effects of experimental setup and modelling assumptions.

Authors
Bazrgari-B; Nussbaum-MA; Madigan-ML
Source
Comput Methods Biomech Biomed Eng 2012 Sep; 15(9):1001-1009
NIOSHTIC No.
20041935
Abstract
The use of system identification to quantify trunk mechanical properties is growing in biomechanics research. The effects of several experimental and modelling factors involved in the system identification of trunk mechanical properties were investigated. Trunk kinematics and kinetics were measured in six individuals when exposed to sudden trunk perturbations. Effects of motion sensor positioning and properties of elements between the perturbing device and the trunk were investigated by adopting different models for system identification. Results showed that by measuring trunk kinematics at a location other than the trunk surface, the deformation of soft tissues is erroneously included into trunk kinematics and results in the trunk being predicted as a more damped structure. Results also showed that including elements between the trunk and the perturbing device in the system identification model did not substantially alter model predictions. Other important parameters that were found to substantially affect predictions were the cut-off frequency used when low-pass filtering raw data and the data window length used to estimate trunk properties.
Keywords
Humans; Men; Women; Body-mechanics; Musculoskeletal-system; Musculoskeletal-system-disorders; Mechanics; Biomechanics; Models; Physiology; Physiological-factors; Pathology; Biological-effects; Author Keywords: trunk mechanical properties; neuromuscular control; system identification
Contact
Maury A. Nussbaum, Department of Industrial and Systems Engineering, Virginia Tech, 250 Durham Hall (0118), Blacksburg, VA 24061, USA
CODEN
CMBEFS
Publication Date
20120901
Document Type
Journal Article
Email Address
nussbaum@vt.edu
Funding Type
Grant
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-008504; B20130124
Issue of Publication
9
ISSN
1476-8259
Source Name
Computer Methods in Biomechanics and Biomedical Engineering
State
VA
Performing Organization
Virginia Polytechnic Institute and State University
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