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相关概念视频

Relative Motion Analysis - Acceleration01:10

Relative Motion Analysis - Acceleration

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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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Rolling With Slipping01:14

Rolling With Slipping

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Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface.
An object's rolling motion is characterized by its rotation around its axis, while linear motion refers to the object's translational motion along a surface. Frictional forces can...
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Wedges01:24

Wedges

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A wedge is a simple machine that serves various purposes, such as adjusting the elevation of structural or mechanical parts, providing stability for heavy objects, and splitting a body into two parts. This versatile tool can amplify an applied force, making it easier to manipulate large or heavy objects.
Consider using a wedge to lift a heavy slab. Here, the wedge functions by converting the applied force into a much larger force directed almost perpendicular to the initial force. This...
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Rolling Without Slipping01:09

Rolling Without Slipping

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People have observed the rolling motion without slipping ever since the invention of the wheel. For example, one can look at the interaction between a car's tires and the surface of the road. If the driver presses the accelerator to the floor so that the tires spin without the car moving forward, there must be kinetic friction between the wheels and the road's surface. If the driver slowly presses the accelerator, causing the car to move forward, the tires roll without slipping. It is...
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Static and Kinetic Frictional Force01:05

Static and Kinetic Frictional Force

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One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
However, if two systems are in contact and are stationary relative to one...
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Frictional Forces on Flat Belts01:28

Frictional Forces on Flat Belts

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Flat belts are commonly used in various industrial applications for transmitting power from one pulley to another. When a flat belt is wrapped around a set of pulleys, it experiences different tensions at the driving pulley ends due to the friction between the belt and pulley surface. When the pulley moves in a counterclockwise direction, the tension T2 on the opposite side of the pulley where the belt is moving away from is higher than the tension T1 on the side where the belt is moving...
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相关实验视频

Updated: Jul 16, 2025

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
11:51

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions

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表面的不稳定性是由一个滑块在颗粒床上拉过的滑块产生的.

Antoine Dop1, Valérie Vidal1, Nicolas Taberlet2

  • 1ENSL, CNRS, Laboratoire de Physique, F-69342 Lyon, France.

Physical review. E
|September 19, 2023
PubMed
概括

在颗粒状物质上移动的滑动器会产生规律的波纹. 这个模式的模式的模式.

科学领域:

  • 颗粒物理 颗粒物理
  • 软物质物理学 软物质物理学
  • 复杂的系统复杂的系统.

背景情况:

  • 颗粒状材料在外力作用下表现出复杂的行为.
  • 了解表面的不稳定性对于预测物质运输和侵蚀至关重要.
  • 颗粒状介质的准静态动力学往往与直觉相反.

研究的目的:

  • 为了研究滑板在颗粒床上移动时表面不稳定的出现.
  • 描述滑块属性与生成的波纹模式之间的关系.
  • 探索物理参数对不稳定性动态的影响.

主要方法:

  • 使用输送带系统拖动滑动器进行实验调查.
  • 二维离散元素方法 (DEM) 模拟以建模颗粒系统.
  • 滑动器参数 (质量,长度,形状,速度) 和接触力学的系统变化.

主要成果:

  • 在颗粒状表面上,自发地形成了高峰和低谷的规律模式.
  • 波浪的波长和振幅随着滑块的长度而变大.
  • 波浪在低和高的滑动物质上消失,这表明一个最佳的限制压力.
  • 滑动器的形状,特别是前面的飞的倾斜,显著影响波纹特征.

更多相关视频

Image-based Lagrangian Particle Tracking in Bed-load Experiments
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Image-based Lagrangian Particle Tracking in Bed-load Experiments

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Visualization of Failure and the Associated Grain-Scale Mechanical Behavior of Granular Soils under Shear using Synchrotron X-Ray Micro-Tomography
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Visualization of Failure and the Associated Grain-Scale Mechanical Behavior of Granular Soils under Shear using Synchrotron X-Ray Micro-Tomography

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相关实验视频

Last Updated: Jul 16, 2025

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
11:51

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions

Published on: February 22, 2018

8.7K
Image-based Lagrangian Particle Tracking in Bed-load Experiments
10:32

Image-based Lagrangian Particle Tracking in Bed-load Experiments

Published on: July 20, 2017

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Visualization of Failure and the Associated Grain-Scale Mechanical Behavior of Granular Soils under Shear using Synchrotron X-Ray Micro-Tomography
09:00

Visualization of Failure and the Associated Grain-Scale Mechanical Behavior of Granular Soils under Shear using Synchrotron X-Ray Micro-Tomography

Published on: September 29, 2019

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结论:

  • 在颗粒状介质中滑动引发的表面不稳定性是一个强大的现象.
  • 滑动器的几何和质量在确定波纹形成和规模方面发挥着关键作用.
  • 需要进一步的研究,以充分阐明滑板拉动装置接口上的摩擦和凝聚力的作用.