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相关概念视频

Space Trusses: Problem Solving01:29

Space Trusses: Problem Solving

586
A space truss is a three-dimensional counterpart of a planar truss. These structures consist of members connected at their ends, often utilizing ball-and-socket joints to create a stable and versatile framework. Due to its adaptability and capacity to withstand complex loads, the space truss is widely used in various construction projects.
Consider a tripod consisting of a tetrahedral space truss with a ball-and-socket joint at C. Suppose the height and lengths of the horizontal and vertical...
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Three-Dimensional Force System:Problem Solving01:30

Three-Dimensional Force System:Problem Solving

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A three-dimensional force system refers to a scenario in which three forces act simultaneously in three different directions. This type of problem is commonly encountered in physics and engineering, where it is necessary to calculate the resultant force on the system, which can then be used to predict or analyze the behavior of the object or structure under consideration.
To solve a three-dimensional force system, first resolve each force into its respective scalar components. Do this using...
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Moment of a Couple: Problem Solving01:30

Moment of a Couple: Problem Solving

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The moment of couple is an essential concept in physics and engineering, used to calculate the rotational force, or torque, that is created when a couple —two equal and opposite forces—acts on an object.
The moment of a couple is found by multiplying the magnitude of one of the forces by the perpendicular distance between the line of action of the two forces. This creates a twisting force, which can be used to rotate an object. The moment of a couple is used to solve problems...
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Statically Indeterminate Problem Solving01:16

Statically Indeterminate Problem Solving

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Statically indeterminate problems are those where statics alone can not determine the internal forces or reactions. Consider a structure comprising two cylindrical rods made of steel and brass. These rods are joined at point B and restrained by rigid supports at points A and C. Now, the reactions at points A and C and the deflection at point B are to be determined. This rod structure is classified as statically indeterminate as the structure has more supports than are necessary for maintaining...
378
Simplification of a Force and Couple System: II01:23

Simplification of a Force and Couple System: II

282
In a three-dimensional system, multiple forces can act on an object. These forces can be combined into a single equivalent force, known as the resultant force. Similarly, the moments generated by these forces can be combined into a single equivalent moment, the resultant couple moment. In certain situations, these two entities may not be mutually perpendicular, meaning they do not have a 90-degree angle between them. This unique condition requires a deeper understanding of the interplay between...
282
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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相关实验视频

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In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
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一个封闭的形式,对解决方案,以局部的非刚性结构-从运动.

Shaifali Parashar, Yuxuan Long, Mathieu Salzmann

    IEEE transactions on pattern analysis and machine intelligence
    |April 5, 2024
    PubMed
    概括

    本研究介绍了一种更快,更准确的非刚性结构-从-运动 (NRSfM) 方法,通过在封闭形式解决表面正常方程,提高3D重建的可靠性.

    科学领域:

    • 计算机视觉 计算机视觉
    • 三维重建的3D重建
    • 几何建模 几何建模

    背景情况:

    • 非刚性结构-从-运动 (NRSfM) 通常使用图像对之间的局部,差异性约束.
    • 现有的方法往往涉及计算上昂贵的多项式解析器,并且由于退化,可以产生不可靠的结果.

    研究的目的:

    • 解决异度/符合NRSfM的计算成本和可靠性问题.
    • 开发一种新的方法,以高效准确地推导和解决表面常态方程.

    主要方法:

    • 衍生出一种新的表面常量方程系统,可以以封闭形式解决.
    • 开发了两个潜在解决方案的本地分歧机制.
    • 引入了可靠性评估,以排除不可靠的正常估计.

    主要成果:

    • 新方法为表面正常提供了两个封闭形式的解决方案,在本地很容易分辨.
    • 该方法可以可靠地评估和丢弃不准确的局部正常估计.
    • 实验结果表明,与最先进的NRSfM方法相比,准确性和速度显著提高.

    结论:

    • 拟议的方法为同度/合规NRSfM提供了更高效和可靠的计算解决方案.

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  • 它克服了现有的高度多项式方程系统和局部退化的局限性.
  • 这一进步使得从图像序列中进行更强大,更准确的3D表面重建成为可能.