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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

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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.
Here, in order to determine the magnitude of velocity and acceleration for point...
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Rigid Body Equilibrium Problems - II01:21

Rigid Body Equilibrium Problems - II

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A rigid body is in static equilibrium when the net force and the net torque acting on the system are equal to zero.
Consider two children sitting on a seesaw, which has negligible mass. The first child has a mass (m1) of 26 kg and sits at point A, which is 1.6 meters (r1) from the pivot point B; the second child has a mass (m2) of 32 kg and sits at point C. How far from the pivot point B should the second child sit (r2) to balance the seesaw?
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Rigid Body Equilibrium Problems - I00:49

Rigid Body Equilibrium Problems - I

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A rigid body is said to be in static equilibrium when the net force and the net torque acting on the system is equal to zero. To solve for rigid body equilibrium problems, do the following steps.
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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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Routh-Hurwitz Criterion II01:19

Routh-Hurwitz Criterion II

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In the application of the Routh-Hurwitz criterion, two specific scenarios can arise that complicate stability analysis.
The first scenario occurs when a singular zero appears in the first column of the Routh table. This situation creates a division by zero issues. To resolve this, a small positive or negative number, denoted as epsilon (∈), is substituted for the zero. The stability analysis proceeds by assuming a sign for ∈. If ∈ is positive, any sign change in the first...
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Stability of Equilibrium Configuration: Problem Solving01:13

Stability of Equilibrium Configuration: Problem Solving

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The stability of equilibrium configurations is an important concept in physics, engineering, and other related fields. In simple terms, it refers to the tendency of an object or system to return to its equilibrium position after being disturbed. The stability of an equilibrium configuration can be analyzed by considering the potential energy function of the system and examining its behavior near the equilibrium point.
Problem-solving in the context of the stability of equilibrium configuration...
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相关实验视频

Updated: Jan 12, 2026

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
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多视图几何中的条件数,相对位置估计中的不稳定性,以及RANSAC.

Hongyi Fan, Joe Kileel, Benjamin Kimia

    IEEE transactions on pattern analysis and machine intelligence
    |November 6, 2025
    PubMed
    概括

    本研究介绍了一个框架来分析数值条件在最小的问题多视图几何学. 它解释了为什么5点和7点算法可能会失败,即使没有异常值,由于内在的不稳定性.

    科学领域:

    • 计算机视觉 计算机视觉
    • 计算几何学的计算几何学
    • 数字分析 数字分析

    背景情况:

    • 相对姿势估计对于3D重建至关重要.
    • 像5点和7点RANSAC这样的标准算法可能会出乎意料地失败.
    • 即使有足够的初始数据,这些故障也可能发生.

    研究的目的:

    • 开发一个一般的框架来分析数值条件在最小的问题.
    • 了解5点和7点最小问题的内在不稳定性.
    • 为评估问题条件提供计算测试.

    主要方法:

    • 利用计算代数和里曼几何学的工具.
    • 在多视图几何学中分析最小问题的数值条件.
    • 基于场景几何和图像数据来描述不稳定性.

    主要成果:

    • 在5点和7点最小问题中确定了内在的不稳定性.
    • 在解决之前开发了评估条件数的方法.
    • 证明RANSAC隐含地选择了条件良好的数据.

    结论:

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  • 该框架提供了对姿势估计算法的失败的见解.
  • 数字条件是最小问题解决者的成功的一个关键因素.
  • 兰萨克的实际成功部分归功于它选择了条件良好的数据.