Improvement of Accuracy in a High-Capacity, Six Degree-of-freedom Load Cell: Application to Robotic Testing of Musculoskeletal Joints |
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Authors: | Lars G. Gilbertson Todd C. Doehring Glen A. Livesay Theodore W. Rudy James D. Kang Savio L-Y. Woo |
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Affiliation: | (1) Spine Biomechanics Laboratory, Musculoskeletal Research Center, Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, PA |
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Abstract: | 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. © 1999 Biomedical Engineering Society.PAC99: 8719Rr, 8780Vt, 0620Fn, 0620Dk, 8719Ff |
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Keywords: | Universal force-moment sensor (UFS) Biomechanical testing Load-displacement response Kinetics Musculoskeletal joint systems |
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