非線形有限要素解析による短下肢装具設計過程での可撓性評価手法

概要

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In this study, we evaluated the flexibihty of an ankle-foot orthosis in the design proess by nonlinear finite element analysis. A digitized orthosis model was made from a plasterleg model using a 3-D digitizing system. A total of 12 orthosis models were made with 3 values of thickness and 4 values of trimming. With each model, we conducted a monlinear finite element analysis to collect modification characteristics, and confirmed its validity from a comparison from the results of a tensile test. We evaluated4orthosis modelschosen from the results of a real gait analysis for theirflexibility unde 3 conditions of simulated gait: during heel-contact, mid-stance, and swing-phage. In nonlinear finite element Analysis, contact definitions of the orthosis model, foot model, floor model and the moment of the ankle joint calcula ted from the gait analysis were used as boundary conditions. Moreover, we evaluated the factor of safety in order to confirm the structural safety of the orthosis. Altogether, this study proposes the possibility of a new orthosis design system.
ライフサポート学会の論文
2007-03-30