针对老年人行走过程滑跌现象的频繁发生,提出了利用改进的所需最大摩擦因数及COM(center of mass)波动值来分析滑跌过程的方法.该方法以基于Kane方程的仿生下肢行走动力学模型为基础,能够实现行走过程动力学参数值的快速检测,能对行走...针对老年人行走过程滑跌现象的频繁发生,提出了利用改进的所需最大摩擦因数及COM(center of mass)波动值来分析滑跌过程的方法.该方法以基于Kane方程的仿生下肢行走动力学模型为基础,能够实现行走过程动力学参数值的快速检测,能对行走过程的任一瞬时平衡状态进行分析,并据此判断和验证滑动和跌倒过程的临界值,建立了老年人滑跌步态的理论基础.通过肌力正常与肌无力老年人的行走步态实验数据比较,下肢肌力不足的老年人,因其神经肌肉控制力下降,步态姿势趋于不稳定,发生滑倒的概率更高.步态分析实验数据表明,该方法能够对滑跌过程进行准确描述.展开更多
A general procedure to capture the 'dynanmic Stiffness' is presented in this paper. The governing equations of motion are formulated for an arbitrary flexible body in large overall motion based on Kane's ...A general procedure to capture the 'dynanmic Stiffness' is presented in this paper. The governing equations of motion are formulated for an arbitrary flexible body in large overall motion based on Kane's equations . The linearization is performed peroperly by means of geometrically nonlinear straindisplacement relations and the nonlinear expression of angular velocity so that the 'dynamical stiffness' terms can be captured naturally in a general tcase. The concept and formulations of partial velocity and angular velocity arrays of Huston's method are extended to the flexible body and form the basis of the analysis. The validity and generality of the procedure presented in the paper are verified by numerical results of its application in both the beam and plate models.展开更多
文摘针对老年人行走过程滑跌现象的频繁发生,提出了利用改进的所需最大摩擦因数及COM(center of mass)波动值来分析滑跌过程的方法.该方法以基于Kane方程的仿生下肢行走动力学模型为基础,能够实现行走过程动力学参数值的快速检测,能对行走过程的任一瞬时平衡状态进行分析,并据此判断和验证滑动和跌倒过程的临界值,建立了老年人滑跌步态的理论基础.通过肌力正常与肌无力老年人的行走步态实验数据比较,下肢肌力不足的老年人,因其神经肌肉控制力下降,步态姿势趋于不稳定,发生滑倒的概率更高.步态分析实验数据表明,该方法能够对滑跌过程进行准确描述.
文摘A general procedure to capture the 'dynanmic Stiffness' is presented in this paper. The governing equations of motion are formulated for an arbitrary flexible body in large overall motion based on Kane's equations . The linearization is performed peroperly by means of geometrically nonlinear straindisplacement relations and the nonlinear expression of angular velocity so that the 'dynamical stiffness' terms can be captured naturally in a general tcase. The concept and formulations of partial velocity and angular velocity arrays of Huston's method are extended to the flexible body and form the basis of the analysis. The validity and generality of the procedure presented in the paper are verified by numerical results of its application in both the beam and plate models.
