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相关概念视频

Discrete Fourier Transform01:15

Discrete Fourier Transform

258
The Discrete Fourier Transform (DFT) is a fundamental tool in signal processing, extending the discrete-time Fourier transform by evaluating discrete signals at uniformly spaced frequency intervals. This transformation converts a finite sequence of time-domain samples into frequency components, each representing complex sinusoids ordered by frequency. The DFT translates these sequences into the frequency domain, effectively indicating the magnitude and phase of each frequency component present...
258
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

458
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...
458
Relative Motion Analysis using Rotating Axes - Acceleration01:22

Relative Motion Analysis using Rotating Axes - Acceleration

330
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...
330
Relative Motion Analysis - Acceleration01:10

Relative Motion Analysis - Acceleration

347
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...
347
Energy Losses in Transformers01:21

Energy Losses in Transformers

861
In an ideal transformer, it is assumed that there are no energy losses, and, hence, all the power at the primary winding is transferred to the secondary winding. However, in reality,  the transformers always have some energy losses, and, hence, the output power obtained at the secondary winding is less than the input power at the primary winding due to energy losses.
There are four main reasons for energy losses in transformers.
The first cause can be  the high resistance of the...
861
Equivalent Circuits for Practical Transformers01:28

Equivalent Circuits for Practical Transformers

413
The practical equivalent circuits of single-phase two-winding transformers exhibit significant deviations from their idealized versions due to the inherent properties of winding resistance and finite core permeability. These properties result in real and reactive power losses, affecting the transformer's performance. Understanding these deviations is crucial for designing more efficient transformers.
In a practical transformer, each winding exhibits resistance and leakage reactance. The...
413

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相关实验视频

Updated: Jun 23, 2025

Simulation of Human-induced Vibrations Based on the Characterized In-field Pedestrian Behavior
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基于相机的动态振动分析使用基于变压器的模型CoTracker和动态模式分解.

Liangliang Cheng1, Justin de Groot1, Kun Xie1

  • 1Dynamics and Vibration Group, Engineering and Technology Institute Groningen, Faculty of Science and Engineering, University of Groningen, 9712 CP Groningen, The Netherlands.

Sensors (Basel, Switzerland)
|June 19, 2024
PubMed
概括

本研究探讨使用CoTracker,一个计算机视觉模型,来测量结构振动. CoTracker显示了全场振动分析的巨大潜力,为传统加速度计提供了具有成本效益的替代方案.

关键词:
我们的 CoTracker 是一个追踪器.基于摄像机的测量方法深度学习是一种深度学习.动态模式分解分解模式分析 模式分析振动 振动 振动是一种振动.

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相关实验视频

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科学领域:

  • 结构健康监测 结构健康监测
  • 计算机视觉 计算机视觉
  • 机械工程 机械工程

背景情况:

  • 加速度计是结构振动监测的标准,但成本昂贵,并提供基于点的数据.
  • 计算机视觉和深度学习的进步使得像素级运动跟踪成为可能.
  • 基于变压器的模型CoTracker在运动跟踪方面表现出色,但其在结构振动测量中的应用尚未得到充分探索.

研究的目的:

  • 调查CoTracker模型在使用基于摄像头的系统提取全场结构振动时的有效性.
  • 为了评估CoTracker在捕获模态分析密度点运动方面的性能.
  • 将CoTracker与传统的加速度计和有限元法 (FEM) 进行比较,以测量振动.

主要方法:

  • 使用CoTracker来跟踪一个横向光束的高速摄像机视频序列中的密度点运动.
  • 使用延迟嵌入动态模式分解 (DMD) 进行模态分析,以提取模态参数.
  • 将CoTracker结果与参考加速度计和FEM模拟数据进行比较.

主要成果:

  • CoTracker成功捕获了密集点运动,表明结构振动.
  • 模态参数,如自然频率,缓冲比率和模态形状,使用DMD进行了提取.
  • CoTracker的性能与加速度计和FEM结果进行了验证,显示了高精度.

结论:

  • CoTracker展示了无接触,全场结构振动测量的巨大潜力.
  • 这种基于摄像头的方法为传统加速度计提供了一个有希望的,可能更具成本效益的替代方案.
  • CoTracker适用于一般结构振动分析和状态监测.