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題 名 | SACH義足分析=Finite Element Analysis for SACH Foot |
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作 者 | 鄔蜀威; 楊世偉; 范文正; | 書刊名 | 中華醫學工程學刊 |
卷 期 | 18:3 1998.09[民87.09] |
頁 次 | 頁153-160 |
分類號 | 410.1644 |
關鍵詞 | 步態分析; 有限元分析; 義足; Gait analysis; Finite element analysis; Prosthesis; |
語 文 | 中文(Chinese) |
中文摘要 | 近年來,由於下肢截肢人口急遽增加,關於義肢的設計改良,遂成為醫學界與工 程界積極努力的方向。傳統上,對於義足的設計,除了以材料試驗及實驗方法分析義足的機 械結構與應力分佈狀況外,亦藉由步態分析評估義足的功能表現。本研究則嘗試以電腦輔助 設計來分析 SACH 義足的功能,並提供有效的改良方法。 本研究首先建立 SACH 義足的三維有限元分析模型。並以兩種方式檢驗模型的可靠程度,分 別為在模型的上端部施加靜態負載,及模型以加速度和地面接觸。將足底最大應力與實驗值 比較,甚為一致,其相對差異值在 15 %以下。 其次,模擬截肢者步行時足底之應力分佈狀況。負載依據為測力板所得步行時足底的反作用 力,初始狀態依據三維運動量測分析系統所得義足與地面的接觸角度。結果顯示,模型能夠 準確預估步態站立期中義足底部的應力數值與變化趨勢。 同時為了改善步態站立期中截肢側的不穩定,在模型底部兩側加上側邊。在相同的負載條件 下截肢側足底的最大有效應力平均降低約 5.5 %,在內外側的左右搖晃程度減小。 應用此 模型進行有限元分析,可輔助傳統上以實驗為主的義足設計方式以電腦模擬可謀求材質改良 及最佳的外型設計。 |
英文摘要 | With the increase number of amputee, the design and improvement of the prosthetic foot become very important. The design of the prosthetic foot was focused on analysis of the mechanical structure and stress distribution by either material tests or experimental analyses, such as gait analysis. A 3-D finite element model for a SACH foot was constructed to evaluate the effects of material and geometry. Two analytical approaches were adopted. The first was performed by applying an end-load static force on the top face of the model, and the other was set possessed velocity and contact to the ground. The results of both methods were comparable to the experimental data. The relative differences were less than 15%. Then, we investigated the stress conditions of the bottom of the foot. The load depended on the reaction force measured by a force-plate during walking. And the angles, between the foot and the ground, from the 3-D movement measurement and analysis system were set to be the initial conditions. Results showed that the model could predict the stress values and trends of the foot rightly. In order to imporve the unstable conditions of the prosthetic limb during stance phase, two strips were added on both sides of the bottom of the foot. Under the same loading conditions, the maximum von Mises stress location of the bottom of the foot in the medial-lateral direction was decreased by 6.05%. It was concluded that the unstable conditions of the prosthetic limb had been improved. This finite element analysis model could help the design of the prosthetic foot. By the way, the improvements of material properties and shape design could be made easily. |
本系統中英文摘要資訊取自各篇刊載內容。