Extraction of Functional Role of Sports Shoes Based on Dynamics analysis of a Shoes-Human Coupling System

本研究建立了一种方法来量化的功能作用的鞋底压缩特性相结合的有限元桁架单元鞋底模型和全身运动方程。将鞋底建模为具有非线性弹簧和阻尼器的桁架单元，建立了鞋底变形方程。利用带有加速度计和冲击器的冲击装置对弹簧和阻尼器进行了冲击试验。通过将人体建模为15个刚性连接段的系统，推导出全身运动方程。计算了在等速跑状态下，由鞋底弹性力和粘性力引起的支撑腿关节力矩对产生全身重心加速度的动态贡献。结果表明：1）鞋底前部弹性引起的踝关节力矩对全身重心加速度有贡献; 2）鞋底粘性引起的膝关节力矩对身体支撑力有负贡献，对推进力有正贡献。

This study has established a methodology to quantify the functional role of compressive characteristics of shoe sole by combining a finite-truss-element shoe sole model and the equation of whole-body motion. The equation of the shoe sole deformation was developed by modeling shoe sole as a construction of truss elements that have nonlinear spring and damper. The properties of the spring and damper were identified from impact test by using an impact device containing an accelerometer and an arm with impactor. The equation of whole-body motion was derived by modeling the human body as a system of 15-rigid linked segments. Dynamic contributions of the support leg joint torques, which were caused by the elastic and viscous forces on the shoe sole, to the generation of whole-body CG's acceleration were calculated under constant running speed condition. The results for a fore/mid foot striker indicate that 1) the ankle joint torque caused by the elastic property of the forepart of shoes sole contributes to the acceleration of whole-body CG, and 2) the knee joint torque caused by the viscous property of shoe sole shows negative contribution to the body support but shows positive contribution to the propulsion.