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CSME 2020/04
Volume 41 No.2
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221-228
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An Evaluation of Spatial and Spherical Motion Generation for Application in Knee Motion Analysis and Simulation
Wen-Tzong Leea
aDepartment of Biomechatronics Engineering, National Pingtung University of Science and Technology, Pingtung, 91201, Taiwan.
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Abstract:
In terms of a mechanical description, the human knee has typically been represented using the open-loop Cylindrical-Cylindrical-Cylindrical linkage. This linkage has a maximum of 6 degrees of freedom. While this linkage has the capacity to exhibit natural knee motion precisely, it requires the user to define up to 6 independent motion parameter ranges to achieve it. In comparison, achieving natural human knee motion using a single degree of freedom linkage could be a significant improvement since the user is required to define only a single motion parameter range. In this work, the applicability of the spatial Revolute-Revolute-Spherical-Spherical and Four Revolute Spherical linkages (both spatial four-bar linkages having single degrees of freedom) for human knee motion analysis and simulation are evaluated. Optimization models for the motion generation of both linkages are applied to produce linkage dimensions that achieve natural knee motion. As an example, the dimensions of Revolute-Revolute-Spherical-Spherical and Four Revolute Spherical linkages are calculated to achieve a group of tibial-femoral positions over an average walking cycle. These linkages are then modeled and their motion simulated in a CAD-based mechanical modeling environment.
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Keywords: Knee Motion, Tibial-femoral Motion, Spatial Linkage, Spherical Linkage, Motion Generation.
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©
2020
CSME , ISSN 0257-9731
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