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相关概念视频

Vector Transformation in Rotating Coordinate Systems01:16

Vector Transformation in Rotating Coordinate Systems

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Consider a vector rotating about an axis with an angular velocity, such that its tip sweeps a circular path.
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Kinematic Equations for Rotation01:30

Kinematic Equations for Rotation

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In mechanics, when one observes a rigid body in rotational motion with constant angular acceleration, it is possible to establish equations for its rotational kinematics. This process resembles how linear kinematics are dealt with in simpler motion studies.
For instance, imagine a point A on a rigid body engaged in circular motion. The translational velocity of this particular point can be calculated by taking the time derivatives of the displacement equation, which essentially measures the...
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Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

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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

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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Curvilinear Motion: Polar Coordinates01:27

Curvilinear Motion: Polar Coordinates

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In polar coordinates, the motion of a particle follows a curvilinear path. The radial coordinate symbolized as 'r,' extends outward from a fixed origin to the particle, while the angular coordinate, 'θ,' measured in radians, represents the counterclockwise angle between a fixed reference line and the radial line connecting the origin to the particle.
The particle's location is described using a unit vector along the radial direction. Deriving the particle's position...
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Curvilinear Motion: Rectangular Components01:23

Curvilinear Motion: Rectangular Components

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Curvilinear motion characterizes the movement of a particle or object along a curved path, notably evident when envisioning a car navigating a winding road. If the car starts at point A, its position vector is established within a fixed frame of reference, where the ratio of the position vector to its magnitude signifies the unit vector pointing in the position vector's direction.
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相关实验视频

Updated: Jul 6, 2025

Author Spotlight: Insights into the Analysis of Human Interaction with 3D Virtual Objects
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可解释的旋转等值四边形神经网络用于3D点云处理.

Wen Shen, Zhihua Wei, Qihan Ren

    IEEE transactions on pattern analysis and machine intelligence
    |January 8, 2024
    PubMed
    概括

    本研究介绍了用于3D点云处理的旋转等价四边形神经网络 (REQNNs). 与传统网络相比,REQNN提高了特征表示,分类准确性和对旋转的稳定性.

    科学领域:

    • 计算机视觉 计算机视觉
    • 机器学习 机器学习
    • 3D数据分析 3D数据分析

    背景情况:

    • 传统的神经网络在3D点云数据中与旋转不变性作斗争.
    • 特征表示需要同时是旋转等值和换不变的,以便进行可靠的3D处理.

    研究的目的:

    • 开发一种方法,将现有的神经网络修改为旋转等值四神经网络 (REQNNs).
    • 为了确保特征表示是3D点云的旋转等值和换不变.

    主要方法:

    • 提出将标准神经网络转化为REQNN的通用规则.
    • 利用四子特征以自然实现旋转等差.
    • 已证明特征和梯度的旋转等差,以及训练的旋转不变.

    主要成果:

    • REQNNs使用四子表示表现来证明特征的自然满足的旋转等差.
    • 证明了梯度的旋转等差和训练直径的旋转不变. 输入 输入 输入 输入
    • 评估了知识表示的稳定性和强度,以抵御对手旋转攻击.

    结论:

    • 在旋转数据上的分类准确性方面,REQNN显著优于传统的神经网络.

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  • REQNN对抗对方旋转攻击时表现出增强的稳定性.
  • 拟议的修订规则为创建用于3D点云处理的旋转等值网络提供了一种一般方法.