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Constraints and Statical Determinacy01:26

Constraints and Statical Determinacy

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In structural engineering, the equilibrium of a system is not only determined by its equations of equilibrium but also with the help of constraints. Constraints refer to restrictions on the motion of a system. The proper combinations of constraints can minimize the total number of constraints needed to maintain a system in mechanical equilibrium. When this happens, the system is said to be statically determinate. For such systems, the unknown reaction supports can be estimated using equilibrium...
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Indeterminate Structure01:18

Indeterminate Structure

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Indeterminate structures refer to structures where internal forces and reactions cannot be determined using only the equations of static equilibrium.  Indeterminate structures have more unknown forces and reaction forces than equations of static equilibrium that can be used to determine them. Indeterminate structures are often used in engineering to create complex, efficient, and aesthetically pleasing structures. There are various types of indeterminate structures used in engineering and...
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Stability of structures01:14

Stability of structures

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In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
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Equations of Equilibrium in Three Dimensions01:30

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When analyzing structures or systems at rest, it is necessary to ensure they are in equilibrium. This is where the vector and scalar equations of equilibrium come into play. These equations are crucial in ensuring a structure is stable and will not collapse or fall apart. The vector and scalar equations of equilibrium provide a framework for analyzing the forces acting on a body.
According to the vector equations of equilibrium, the vector sum of all the external forces acting on a body must...
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Rigid Body Equilibrium Problems - II01:21

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A rigid body is in static equilibrium when the net force and the net torque acting on the system are equal to zero.
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A rigid body is said to be in static equilibrium when the net force and the net torque acting on the system is equal to zero. To solve for rigid body equilibrium problems, do the following steps.
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Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
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肢体之间的因果相互作用和动态稳定性,而在行走时,腿部受到强加的约束.

Genevieve K R Williams1, Domenico Vicinanza2, Michael Attias3

  • 1Department of Public Health and Sports Sciences, University of Exeter, Exeter, United Kingdom.

Frontiers in human neuroscience
|September 20, 2024
PubMed
概括

这项研究表明,腿部运动冗余性支持因果相互作用,增强行走稳定性. 步行限制增加了复杂性,并减少了双腿之间的协调,影响了运动控制的动态.

关键词:
临床步态分析临床步态分析外骨架 (exoskeleton) 是一个外骨架.非线性动力学的非线性动态病态步态的病态步态.对称性对称性对称性对称性对称性对称性

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科学领域:

  • 生物力学 生物力学
  • 发动机控制器的控制器
  • 非线性动力学是一种非线性动力学.

背景情况:

  • 了解步态动态对于运动控制研究至关重要.
  • 研究腿部运动的复杂性,稳定性和因果关系为运动控制提供了洞察力.
  • 被动外骨架可以模拟诸如胃半径收缩等疾病,以研究步行.

研究的目的:

  • 为了检查行走时的运动控制系统动态.
  • 在双边和单边约束下分析腿部运动复杂性,稳定性和因果相互作用.
  • 为了研究模拟胃半收缩对步行的影响.

主要方法:

  • 收集了10名健康参与者在自我选择的快速行走过程中的动力学数据.
  • 定义了一个复杂性-不稳定性指数 (CII) 使用相关性维度和最大的利亚普诺夫指数.
  • 雇员交叉映射用于探索腿部运动之间的因果相互作用.

主要成果:

  • 正常步行表现出高跨腿驱动和低CII (高稳定性,低复杂性).
  • 双边约束减少了双腿间的驱动力,增加了CII.
  • 单边的约束导致受约束的腿驱动不受约束的腿,受约束腿的CII更高.

结论:

  • 肢体运动冗余性促进因果相互作用,减少复杂性并增强行走稳定性.
  • 冗余性可以实现适应性和最佳的系统交互.
  • 非线性和因果变量,与生物力学因素一起,捕捉功能运动模式.