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相关概念视频

Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

233
Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
233
Design Example: Deciding Thickness of Lubricating Fluid in a Shaft01:23

Design Example: Deciding Thickness of Lubricating Fluid in a Shaft

155
Effective lubrication between a rotating shaft and its bearing housing is essential in rotating machinery to minimize friction, wear, and energy loss. With carefully controlled thickness and viscosity, the lubricant layer prevents metal-to-metal contact, ensuring smooth operation.
To calculate the required thickness of the lubricant layer, the tangential velocity at the shaft's surface must first be determined. This velocity is calculated by converting the rotational speed to angular...
155
Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

229
When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
229
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

325
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
325
Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

229
In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
229
Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

440
One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
440

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相关实验视频

Updated: Sep 8, 2025

Construction and Characterization of a Novel Vocal Fold Bioreactor
11:11

Construction and Characterization of a Novel Vocal Fold Bioreactor

Published on: August 1, 2014

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在灵活的外中优化噪声控制

Hani Alahmadi1, Muhammad Afzal2,3, Naif Alkuhayli1

  • 1Department of Mathematics, College of Science, Jouf University, Sakaka, Saudi Arabia.

PloS one
|September 5, 2025
PubMed
概括

这项研究研究了灵活的圆柱体外中的膜盘如何影响声波传播. 这些发现为设计更好的声衰减系统提供了洞察力.

科学领域:

  • 声学和波浪传播
  • 结构力学
  • 计算流体动力学

背景情况:

  • 灵活的圆柱形外用于各种应用,包括声波引导.
  • 了解波传播特征对于优化系统性能至关重要.
  • 结构界面可以显著改变波动.

研究的目的:

  • 分析带有嵌入膜盘的柔性圆柱体外的声学行为.
  • 研究这些膜盘对声波传播的影响.
  • 为设计有效的基于波导的声学减弱系统提供见解.

主要方法:

  • 模拟嵌入膜盘在外段的交叉点上的动态.
  • 使用模式匹配 (MM) 和Galerkin方法的组合解决边界值问题.
  • 使用赫尔姆霍尔茨方程和多内尔-穆什塔里方程,分别用于流体和弹性域.

主要成果:

  • 该研究提供了一个半分析解决方案,通过一般化的正交条件进行验证.
  • 数字模拟探索几何参数 (半径,磁盘大小) 和激发频率的影响.
  • 这项研究量化了膜盘对波传播特性的影响.

结论:

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  • 结构接口上的膜盘显著影响弹性圆柱体外中的声波传播.
  • 开发的方法准确地模拟这些效应,使得准确的预测.
  • 这些结果对于优化声衰减波导的设计具有价值.