A Well-Posed, Embedded Constraint Representation of Joint Moments From Kinesiological Measurements

[+] Author and Article Information
Behzad Dariush

Honda R&D Americas, Inc., Fundamental Research Laboratories, 800 California St., Suite 300, Mountain View, CA 94041email: bdariush@yahoo.com

Hooshang Hemami

Department of Electrical Engineering, The Ohio State University, 2015 Neil Ave., Columbus, OH 43210-1272email: hemami@ee.eng.ohio-state-edu

Mohamad Parnianpour

Department of Industrial, Welding and Systems Engineering, The Ohio State University, 1971 Neil Ave., Columbus, OH 43210-1271email: parnianpour.1@osu.edu

J Biomech Eng 122(4), 437-445 (Jan 11, 2000) (9 pages) doi:10.1115/1.1286677 History: Received March 24, 1998; Revised January 11, 2000
Copyright © 2000 by ASME
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(a) An open-chain, n-segment sagittal linkage system with point contact between the joints; (b) a three-segment sagittal system modeling the leg, thigh, and trunk; (c) forces F1 and G1 representing the measured ground reaction forces; joint moments U1,U2, and U3 correspond to the ankle, knee, and hip, respectively
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Signal-to-noise ratio associated with the marker displacement at the ankle, knee, and hip
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Root-mean-square (rms) error associated with joint moment computations using the Inward Newton-Euler (IN-E) formulation and the embedded constraint representation (ECR methods I and II) at different noise levels; results for a bowing motion
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Root-mean-square (rms) error associated with joint moments using the Outward Newton-Euler (ON-E) formulation versus the embedded constraint representation (ECR method II) at different noise levels; ankle torque U1 computed using ECR (method II), and provides boundary condition for the ON-E




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