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相关概念视频

Finding the Center of Gravity01:03

Finding the Center of Gravity

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The center of gravity of a body is an imaginary point where the body's total weight is assumed to be concentrated, and the body is perfectly balanced. The center of the mass of a body is a point at which the whole of the mass of the body appears to be concentrated. If the acceleration due to gravity, g, has the same value at all points on a body, its center of gravity is identical to its center of mass. The center of gravity of homogeneous bodies such as a sphere, cube, or rectangular plate...
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Relative Motion Analysis using Rotating Axes-Problem Solving01:29

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Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
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Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

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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.
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Relative Motion Analysis using Rotating Axes - Acceleration01:22

Relative Motion Analysis using Rotating Axes - Acceleration

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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.
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Relative Motion Analysis - Acceleration01:10

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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...
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Center of Mass: Introduction01:03

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Any object that obeys Newton's second law of motion is made up of a large number of infinitesimally small particles. Objects in motion can be as simple as atoms or as complex as gymnasts performing in the Olympics. The motion of such objects is described about a point called the center of mass of the object. The center of mass of an object is a point that acts as if the whole mass is concentrated at that point. The center of mass of an object with a large number of infinitesimally small...
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使用基于压力中心的算法进行跨步检测,用于实时应用程序.

Matjaž Zadravec1, Zlatko Matjačić2

  • 1University Rehabilitation Institute Republic of Slovenia, Linhartova 51, SI-1000, Ljubljana, Slovenia. matjaz.zadravec@ir-rs.si.

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概括

这项研究引入了一种新的算法,用于使用来自仪器跑步机的压力中心 (CoP) 信号来实时检测步态事件. 该算法准确地识别了步行事件和跨步,改善了康复中的实际应用.

关键词:
资产负债表的评估 资产负债表的评估生物反的回报压力中心的压力中心跨越阶段的跨越阶段步态事件检测 步态事件检测有仪器的跑步机.基于干扰的平衡训练是基于干扰的平衡训练.实时算法 实时算法在跑步机上行走,在跑步机上行走.

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科学领域:

  • 生物力学 生物力学
  • 康复工程 康复工程
  • 人类机动运动分析分析

背景情况:

  • 步行事件检测对于行走康复和生物反至关重要.
  • 当前的在线算法通常需要附加传感器,从而限制了实用性.
  • 使用压力中心 (CoP) 信号的仪器化跑步机提供了一个无传感器的替代方案,但与乱的行走作斗争.

研究的目的:

  • 开发和验证基于CoP的实时算法,用于检测步行事件和跨步.
  • 为了解决现有方法在扰乱步行时检测十字步的局限性.
  • 为了评估算法在不同的人群和行走条件中的表现.

主要方法:

  • 开发了一种结合值和逻辑技术的新型算法.
  • 该算法在健康个体,中风幸存者和经过横截肢的人的COP数据上进行了测试.
  • 通过比较实时检测到的事件与线下识别的事件来评估性能,测量绝对平均误差 (AME) 和成功率.

主要成果:

  • 该算法在检测乱行走期间的本地步态事件和交叉步态事件方面取得了高准确性.
  • 在跨步检测中观察到94%的成功率,平均AME的脚跟打击是64 ms,脚脱落是111 ms.
  • 在不同的人群中,表现一致,尽管步行速度影响了健康参与者的成功率.

结论:

  • 开发的基于CoP的算法推进了仪器跑步机上的实时步态事件检测.
  • 它有效地识别了步态事件和跨步,为人类运动提供了有价值的见解.
  • 该算法在不同人群和步态模式中的强度支持其在临床步态分析和康复中的潜力.