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相关概念视频

Relative Motion Analysis - Acceleration01:10

Relative Motion Analysis - Acceleration

362
A slider-crank mechanism converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...
362
Absolute Motion Analysis- General Plane Motion01:24

Absolute Motion Analysis- General Plane Motion

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Visualize a drone, with its propellers spinning rapidly, hovering mid-air. The fascinating movements and operations of this drone can be comprehended by applying the principle of general plane motion.
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the...
225
Relative Motion Analysis - Velocity01:24

Relative Motion Analysis - Velocity

370
A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
370
Relative Motion Analysis using Rotating Axes - Acceleration01:22

Relative Motion Analysis using Rotating Axes - Acceleration

341
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame. The absolute velocity of point B is determined by adding the absolute velocity of point A, the relative velocity of point B in the rotating frame, and the effects caused by the angular velocity within the rotating frame.
Time differentiation is...
341
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

471
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
471

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OpenCap:来自智能手机视频的人类运动动态.

Scott D Uhlrich1, Antoine Falisse1, Łukasz Kidziński1

  • 1Departments of Bioengineering, Stanford University, Stanford, California, United States of America.

PLoS computational biology
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PubMed
概括
此摘要是机器生成的。

OpenCap是一个开源平台,使用智能手机视频来分析人类运动动态. 它准确地预测伤害风险和疾病进展标志物,使生物力学分析易于获得和负担得起.

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科学领域:

  • 生物力学 生物力学
  • 人类运动分析 人类运动分析
  • 可穿戴技术可穿戴技术

背景情况:

  • 量化人类运动动态对于预测受伤风险和疾病进展至关重要.
  • 目前的方法在大规模研究和临床实践中受到限制,原因是高成本,时间和专业知识要求.

研究的目的:

  • 介绍和验证OpenCap,这是一个开源平台,用于计算人类运动动力学和动态.
  • 为了证明OpenCap能够使访问先进的生物机械分析变得民主化.

主要方法:

  • 使用智能手机视频与姿势估计算法来识别身体的地标.
  • 使用深度学习和生物力学模型进行3D动力学估计.
  • 应用基于物理的模拟来确定肌肉激活和肌肉骨动力学.
  • 具有基于云的Web应用程序,用于自动数据处理和可视化.

主要成果:

  • OpenCap准确地预测关键的动态指标,包括肌肉激活,关节负荷和关节时刻.
  • 在100名受试者的研究中,与传统的实验室方法相比,证明了25倍的速度增加和<1%的成本降低.
  • 验证了平台查疾病风险和评估干预有效性的能力.

结论:

  • OpenCap显著降低了人类运动动态分析的进入障碍.
  • 该平台有助于将生物力学指标集成到大规模研究,临床试验和实践中.
  • OpenCap使肌肉骨健康和运动模式的评估更快,更具成本效益.