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相关概念视频

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.
Time differentiation is...
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Measuring Acceleration Due to Gravity01:12

Measuring Acceleration Due to Gravity

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Consider a coffee mug hanging on a hook in a pantry. If the mug gets knocked, it oscillates back and forth like a pendulum until the oscillations die out.
A simple pendulum can be described as a point mass and a string. Meanwhile, a physical pendulum is any object whose oscillations are similar to a simple pendulum, but cannot be modeled as a point mass on a string because its mass is distributed over a larger area. The behavior of a physical pendulum can be modeled using the principles of...
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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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Relative Motion Analysis using Rotating Axes01:25

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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.
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...
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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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皮普托:精确的惯性基管道,用于使用三轴加速度计进行基于值的落检测.

Stavros N Moutsis1, Konstantinos A Tsintotas1, Antonios Gasteratos1

  • 1Department of Production and Management Engineering, Democritus University of Thrace, 12 Vas. Sophias, GR-671 32 Xanthi, Greece.

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|September 28, 2023
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概括
此摘要是机器生成的。

本研究介绍了PIPTO,这是一条使用加速度计数据和基于值的技术的低复杂性落检测管道. 开源系统准确地识别掉落及其时间范围,有助于老年人的安全.

关键词:
基于加速的识别.人类跌倒检测 检测 人类跌倒检测穿戴式设备是一种可穿戴的设备.

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科学领域:

  • 生物医学工程 生物医学工程
  • 老年学是一门学科.
  • 计算机科学 计算机科学

背景情况:

  • 跌倒是交通事故之后的第二大死亡原因,不成比例地影响老年人.
  • 现有的落检测方法利用各种传感器和技术,包括机器学习和基于启发式的方法.
  • 将启发式技术与机器学习模型相结合,可以降低掉落检测系统中的计算成本.

研究的目的:

  • 用基于值的技术呈现一种低复杂度的管道,用于降落检测.
  • 开发一个能够适应各种加速度传感器和数据频率的系统.
  • 为了能够在一个时间序列内检测多个落,并指定它们的时间范围.

主要方法:

  • 基于值的技术应用于来自三轴加速度计的数据.
  • 该系统处理可变输入长度,并根据总量向量的大小检测掉落.
  • 开发的框架,PIPTO,在Python和C语言中实现.

主要成果:

  • 在多个数据集上实现了落检测的高性能.
  • 在MMsys上,灵敏度达到90.40%,在KFall上达到91.56%.
  • 在MMsys上记录了93.96%的特异性,在KFall上记录了85.90%.

结论:

  • 拟议的PIPTO管道提供了一个计算高效和准确的解决方案,用于降落检测.
  • 该系统的适应性和开源性质有助于研究界采用该系统.
  • 皮普托通过提供可靠的摔倒检测能力,为提高老年人的安全性做出了贡献.