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相关概念视频

Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

370
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.
Here, in order to determine the magnitude of velocity and acceleration for point...
370
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

433
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...
433

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相关实验视频

Updated: May 10, 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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阿尔卑斯山滑雪运动运动分析:传感器放置和定向不变传感

Behrooz Azadi1,2, Michael Haslgrübler1, Alois Ferscha2

  • 1Pro2Future GmbH, Altenberger Strasse 69, 4040 Linz, Austria.

Sensors (Basel, Switzerland)
|April 26, 2025
PubMed
概括

本研究介绍了惯性测量单元 (IMU) 的预处理算法,以准确跟踪高山滑雪者的转动动作. 该方法对传感器放置和方向变化进行校正,使滑雪行为的可靠分析成为可能.

科学领域:

  • 运动科学 运动科学 运动科学
  • 生物力学 生物力学
  • 传感器技术 传感器技术

背景情况:

  • 准确估计滑雪者的身体姿势和倾向对于分析转行为至关重要.
  • 惯性测量单元 (IMU) 在具有挑战性的条件下提供动力学数据,但对位置和方向变化敏感.
  • 传感器数据的变化可能会阻碍对滑雪表现的可靠评估.

研究的目的:

  • 研究传感器放置和定位对高山滑雪中的IMU信号的影响.
  • 开发和验证用于标准化IMU数据的预处理算法.
  • 为了能够对滑雪者的转动运动进行可靠的检测和分析,无论传感器的设置如何.

主要方法:

  • 使用基于四子的补充波器 (CF) 的传感器融合方法.
  • 原始IMU信号被旋转到参考方向,大致接近质量中心 (CoM) 附近的位置.
  • 全球波波谱被用来提取和分析转动的运动.

主要成果:

  • 预处理算法有效地重建了侧向运动,并代表了滑雪转.
  • 在包括智能手机在内的14个传感器中,独立于传感器放置和定位检测到滑雪转.
  • 与六名滑雪者进行的实地实验显示,与参考传感器相比,转检测一致,根平均平方误差 (RMSE) 为0.77和平均绝对误差 (MAE) 为0.50.
关键词:
阿尔卑斯山滑雪运动监测监测惯性测量单位是一种惯性测量单位.运动分析分析运动分析.融合传感器 融合传感器 融合传感器传感器的位置和方向.

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Last Updated: May 10, 2025

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结论:

  • 拟议的算法显著提高了基于IMU的高山滑雪运动动力学分析的可靠性.
  • 这种方法克服了与传感器放置和方向变化相关的挑战.
  • 这些发现支持使用IMU来客观和一致地评估滑雪者的转行为和能力.