Journal ArticleDOI
Stiffness Formulations of Planar Kinematics
Fumio Fujii,Yukio Usuda +1 more
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TLDR
In this paper, a simple theory using the stiffness concept is presented for linkage-motion analysis, and the nonlinear incremental mechanism equations are established and their solution procedure is proposed, which can be incorporated into existing finite element computer program systems and can be applied to general three-dimensional mechanisms.Abstract:
A simple theory using the stiffness concept is presented for linkage-motion analysis. The nonlinear incremental mechanism equations are established and their solution procedure is proposed. The kinematic system is first regarded as an instable elastic structure. The tangent stiffness equations are updated for current mechanism configurations. The obtained singular stiffness matrix is then used to predict incremental nodal displacements. The stress-associated deformation is designated as numerical error. The proposed stiffness method follows successively the mechanism motion in an incremental-iterative manner. Computed numerical examples show that the elastic deformation can easily be removed with a few iterations. The proposed stiffness approach to kinematics may be incorporated into existing finite-element computer program systems and can be applied to general three-dimensional mechanisms.read more
Citations
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Journal ArticleDOI
How to recognize the order of infinitesimal mechanisms - a numerical approach
TL;DR: In this article, a distinction is made between infinitesimal and finite mechanisms, the former being characterized by one or several directions of lower stiffness, whereas the latter show at least one finite admissible displacement for which none of the bars undergoes any elongation.
Journal ArticleDOI
Pinpointing bifurcation points and branch-switching
Fumio Fujii,Shigenobu Okazawa +1 more
TL;DR: In this article, a review of the methodology for nonlinear bifurcation analysis is presented, including all of these fundamental strategies, including locally and globally convergent nonlinear solution methods.
Shape formation of space trusses
TL;DR: In this paper, the shape formation of different forms of space trusses with non-zero Gaussian curvature by means of a post-tensioning technique is investigated theoretically and verified by experimental models.
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