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相关概念视频

Angular Velocity and Acceleration01:11

Angular Velocity and Acceleration

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We previously discussed angular velocity for uniform circular motion, however not all motion is uniform. Envision an ice skater spinning with their arms outstretched; when they pull their arms inward, their angular velocity increases. Additionally, think about a computer's hard disk slowing to a halt as the angular velocity decreases. The faster the change in angular velocity, the greater the angular acceleration. The instantaneous angular acceleration is defined as the derivative of...
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Angular Momentum and Principle Axes of Inertia01:09

Angular Momentum and Principle Axes of Inertia

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The concept of angular momentum for a solid structure is illustrated as the cumulative result of the cross-product of the position vector of the mass element and the cross-product of the body's angular velocity with the position vector.
To put this equation into simpler terms, it can be reconfigured using rectangular coordinates. This involves choosing an alternative set of XYZ axes that are arbitrarily inclined with respect to the reference frame. The process of deriving the rectangular...
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Angular Momentum about an Arbitrary Axis01:11

Angular Momentum about an Arbitrary Axis

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Imagine a rigid body with a mass denoted as 'm', which has its center of mass at point G and is rotating around an inertial reference frame. The angular momentum at an arbitrary point P can be calculated by taking the cross product of the position vector and linear momentum vector for each individual mass element.
The velocity of a mass element comprises its translational velocity and the relative velocity instigated by the body's rotation. Substituting the velocity equation into...
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Relating Angular And Linear Quantities - II01:05

Relating Angular And Linear Quantities - II

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In the case of circular motion, the linear tangential speed of a particle at a radius from the axis of rotation is related to the angular velocity by the relation:
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Relating Angular And Linear Quantities - I01:09

Relating Angular And Linear Quantities - I

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If the rotational definitions are compared with the definitions of linear kinematic variables from motion along a straight line and motion in two and three dimensions, we can observe a mapping of the linear variables to the rotational ones.
When comparing the linear and rotational variables individually, the linear variable of position has physical units of meters, whereas the angular position variable has dimensionless units of radians, as it is the ratio of two lengths. The linear velocity...
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Angular Momentum01:21

Angular Momentum

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Angular momentum characterizes an object's rotational motion and is defined as the moment of its linear momentum about a specified point O. When a particle moves along a curved path in the x-y plane, the scalar formulation calculates the magnitude of its angular momentum, utilizing the moment arm (d), representing the perpendicular distance from point O to the line of action of the linear momentum. Despite being scalar in formulation, angular momentum is inherently a vector quantity. Its...
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相关实验视频

Updated: May 15, 2025

An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field
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一个多方法框架,用于在传感器校准和不确定性量化中建立角加速参考值.

Maximilian Gießler1,2, Bernd Waltersberger3, Thomas Götz4

  • 1Department of Mechanical and Process Engineering, Offenburg University of Applied Sciences, Offenburg, Germany. maximilian.giessler@hs-offenburg.de.

Communications engineering
|April 8, 2025
PubMed
概括
此摘要是机器生成的。

这项研究引入了测量机器人运动干扰的新框架. 它验证了惯性测量集群 (IMC) 作为校准动力传感器的可靠标准,提高了机器人的精度.

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Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements
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A Method for Quantifying Upper Limb Performance in Daily Life Using Accelerometers
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相关实验视频

Last Updated: May 15, 2025

An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field
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Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements
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科学领域:

  • 机器人和控制系统 机器人和控制系统
  • 传感器技术和测量科学 传感器技术和测量科学

背景情况:

  • 工业,医疗保健和家庭中的机器人面临着意外干扰的挑战.
  • 实时反依赖于噪音传感器数据,反向动态计算放大噪音.
  • 对于直接传感方法的量化测量不确定性仍然没有得到充分解决.

研究的目的:

  • 提出一个多方法框架,以建立一个角加速参考.
  • 为了证明这个参考作为校准动力传感器的标准的实用性.
  • 为量化新型直接测量传感器,惯性测量集群 (IMC) 的不确定性.

主要方法:

  • 开发一个多方法框架的角度加速参考.
  • 使用蒙特卡洛模拟来量化惯性测量集群 (IMC) 的不确定性.
  • 使用最小平方优化进行比较分析与其他测量方法相比.

主要成果:

  • IMC 显示低标准偏差 (平均值) 0.3rad/s2,95%CI:[0.28,0.31]rad/s2) 在角加速时达到21rad/s2.
  • 在IMC实现了可靠的数据表记录的角度加速度测量.
  • 与其他方法相比,IMC显示角度加速,速度和角度的偏差较小.

结论:

  • 拟议的框架为动力传感器校准提供了可靠的参考标准.
  • 惯性测量集群 (IMC) 提供卓越的精度和运动传感的偏差降低.
  • 这项工作解决了在直接机器人运动测量中对不确定性定量化的关键需求.