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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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Video Experimental Relacionado

Updated: Sep 8, 2025

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

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Optimización del control de ruido en capas flexibles con variaciones de discos de membrana puente

Hani Alahmadi1, Muhammad Afzal2,3, Naif Alkuhayli1

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

PloS one
|September 5, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio investiga cómo los discos de membrana en capas cilíndricas flexibles afectan la propagación de las ondas acústicas. Los hallazgos ofrecen ideas para diseñar mejores sistemas de atenuación acústica.

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Área de la Ciencia:

  • Acústica y propagación de ondas
  • Mecánica estructural
  • Dinámica de fluidos computacional

Sus antecedentes:

  • Las conchas cilíndricas flexibles se utilizan en diversas aplicaciones, incluida la guía de ondas acústicas.
  • Comprender las características de propagación de ondas es crucial para optimizar el rendimiento del sistema.
  • Las interfaces estructurales pueden alterar significativamente la dinámica de las ondas.

Objetivo del estudio:

  • Para analizar el comportamiento acústico de las conchas cilíndricas flexibles con discos de membrana incrustados.
  • Para investigar la influencia de estos discos de membrana en la propagación de ondas acústicas.
  • Proporcionar ideas para el diseño de sistemas de atenuación acústica eficaces basados en guías de onda.

Principales métodos:

  • Modelado de la dinámica de los discos de membrana incrustados en las uniones de segmentos de la cáscara.
  • Solución del problema del valor límite utilizando una combinación de los métodos de ajuste de modo (MM) y Galerkin.
  • Utilizando las ecuaciones de Helmholtz y Donnell-Mushtari para dominios fluidos y elásticos, respectivamente.

Principales resultados:

  • El estudio presenta una solución semianalítica validada por condiciones de ortogonalidad generalizadas.
  • Las simulaciones numéricas exploran el impacto de los parámetros geométricos (radios, tamaño del disco) y la frecuencia de excitación.
  • La investigación cuantifica el efecto de los discos de membrana en las características de propagación de ondas.

Conclusiones:

  • Los discos de membrana en las interfaces estructurales influyen significativamente en la propagación de ondas acústicas en capas cilíndricas flexibles.
  • La metodología desarrollada modela con precisión estos efectos, lo que permite realizar predicciones precisas.
  • Los resultados son valiosos para optimizar el diseño de las guías de onda de atenuación acústica.