Improvement of accuracy in a high-capacity, six degree-of-freedom load cell : Application to robotic testing of musculoskeletal joints

This study investigated a previously unaccounted for source of error in a high-capacity, six degree-of-freedom load cell used in multi-degree-of-freedom robotic testing of musculoskeletal joints, an application requiring a load cell with high accuracy in addition to high load capacity. A method of c...

Full description

Saved in:
Bibliographic Details
Published in:Annals of biomedical engineering 1999-11, Vol.27 (6), p.839-843
Main Authors: GILBERTSON, L. G, DOEHRING, T. C, LIVESAY, G. A, RUDY, T. W, KANG, J. D, WOO, S. L.-Y
Format: Article
Language:English
Subjects:
Accuracy
Bias
Biological and medical sciences
Calibration
Compressive Strength
Humans
Joints - physiology
Linear Models
Medical sciences
Nonlinear Dynamics
Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects)
Reproducibility of Results
Robotics - methods
Robotics - standards
Space life sciences
Technology. Biomaterials. Equipments. Material. Instrumentation
Weight-Bearing
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This study investigated a previously unaccounted for source of error in a high-capacity, six degree-of-freedom load cell used in multi-degree-of-freedom robotic testing of musculoskeletal joints, an application requiring a load cell with high accuracy in addition to high load capacity. A method of calibration is presented for reducing the error caused by changes in universal force-moment sensor (UFS) orientation within a gravitational field. Uncorrected, this error can exceed a magnitude of 1% of the full-scale load capacity-the manufacturer-stated accuracy of the UFS. Implementation of the calibration protocol reduced this error by approximately 75% for a variety of loading conditions. This improvement in load cell accuracy (while maintaining full load capacity) should improve both the measurement and control of specimen kinetics by robotic/UFS and other biomechanical testing systems.
ISSN:0090-6964
1573-9686
DOI:10.1114/1.236