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相关概念视频

Kinematic Equations: Problem Solving01:15

Kinematic Equations: Problem Solving

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When analyzing one-dimensional motion with constant acceleration, the problem-solving strategy involves identifying the known quantities and choosing the appropriate kinematic equations to solve for the unknowns. Either one or two kinematic equations are needed to solve for the unknowns, depending on the known and unknown quantities. Generally, the number of equations required is the same as the number of unknown quantities in the given example. Two-body pursuit problems always require two...
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Impedances and Admittance01:23

Impedances and Admittance

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In the realm of AC circuits, passive circuit elements like resistors, inductors, and capacitors take on a different character when characterized by phasor voltage and current. Their behavior is expressed through impedance, a vital concept in AC circuit analysis.
Impedance is a measure of resistance to sinusoidal current flow in an AC circuit. Unlike their behavior in DC circuits, where inductors appear as short circuits and capacitors as open circuits, the behavior of these components in AC...
730
Three-Dimensional Force System:Problem Solving01:30

Three-Dimensional Force System:Problem Solving

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A three-dimensional force system refers to a scenario in which three forces act simultaneously in three different directions. This type of problem is commonly encountered in physics and engineering, where it is necessary to calculate the resultant force on the system, which can then be used to predict or analyze the behavior of the object or structure under consideration.
To solve a three-dimensional force system, first resolve each force into its respective scalar components. Do this using...
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Impedance Combination01:21

Impedance Combination

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Consider a string of christmas lights, each bulb symbolizing an impedance element. In this series configuration, the flow of electric current remains uniform across every component. This behavior aligns with Kirchhoff's Voltage Law (KVL), which asserts that the total impedance in such a setup equals the sum of individual impedances—akin to resistors in series. It follows that the voltage from the power source is distributed proportionally among these components, adhering to the...
459
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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Two-Dimensional Force System: Problem Solving01:29

Two-Dimensional Force System: Problem Solving

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Solving problems related to two-dimensional force systems is an essential aspect of mechanics and engineering. By applying the principles of vector analysis and force equilibrium, one can determine the effect of multiple forces acting on an object in a two-dimensional space.
The first step to solving a two-dimensional force system problem is to draw a free-body diagram of the object under consideration. This diagram helps identify all the external forces acting on the object, including their...
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Updated: Jul 24, 2025

Oscillation and Reaction Board Techniques for Estimating Inertial Properties of a Below-knee Prosthesis
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关节阻抗能否通过显式和隐式解决器改善动态腿模拟?

Serhii Bahdasariants1, Ana Maria Forti Barela2, Valeriya Gritsenko1,3

  • 1Department of Human Performance, School of Medicine, West Virginia University, Morgantown, WV, United States of America.

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概括

优化生物机械模拟可以改善受伤后运动障碍的实时诊断. 了解粘性弹性,整合方法和采样率可以提高神经肌肉疾病恢复和假肢的准确性.

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Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion
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相关实验视频

Last Updated: Jul 24, 2025

Oscillation and Reaction Board Techniques for Estimating Inertial Properties of a Below-knee Prosthesis
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Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion
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科学领域:

  • 生物力学 生物力学
  • 计算建模计算建模
  • 神经康复疗法 神经康复疗法

背景情况:

  • 像中风这样的神经肌肉损伤会破坏复杂的身体运动,影响运动和动力学.
  • 准确的生物机械模型对于实时诊断移动问题至关重要.
  • 当前的动态计算需要优化速度和主题特异性.

研究的目的:

  • 研究内在粘性弹性,数值整合方法和采样频率对生物机械模拟准确性和稳定性的影响.
  • 为了确定实时,特定主题的动态模拟的最佳参数.

主要方法:

  • 使用了带有粘弹性元素的17度自由度 (DOF) 双脚模型.
  • 动态模拟结合了摇摆阶段实验动力学.
  • 数值错误的评估基于不同的粘性弹性,采样率和集成器类型.

主要成果:

  • 最佳参数选择实现了精确的关节动力学 (误差<1%) 和动力学 (误差<5%),具有更大的模拟时间步骤.
  • 联合粘弹性减少了显式方法的整合误差,但对于隐式方法提供了最小的好处.
  • 获得了关于粘性弹性,采样率和整合器选择之间的相互作用的见解.

结论:

  • 优化的生物机械模拟可以准确地重建人类运动动态.
  • 这些发现可以增强移动障碍的诊断工具.
  • 改进的模拟支持神经肌肉疾病的功能恢复和先进的假肢控制.