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The torque-free motion refers to the movement of a rigid body in space when no external torques are acting upon it. This type of motion can be observed in environments where there are no external forces or frictions, like in outer space. For example, a rotation of Mars in space is a torque-free motion. Mars is an axisymmetric object, meaning it has an axis of symmetry along which it rotates, designated as the z-axis. The rotating frame of reference is defined such that the center of mass of...
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Residual Stresses in Circular Shafts01:10

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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...
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Stresses in a Shaft01:18

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The shaft PQ is subjected to a twisting force when equal and opposite torques are applied on either side. A section that cuts perpendicular to the shaft's axis at any arbitrary point R is examined to understand this. When the free-body diagram of the QR segment is analyzed, it reveals the shearing forces exerted by the PR portion onto the QR segment as the shaft experiences twisting.
Applying equilibrium conditions to the QR segment establishes that the internal shearing forces within the...
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Circular Shaft - Stresses in Linear Range01:13

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Consider a scenario where a circular shaft is subject to torque that remains within the boundaries of Hooke's Law, avoiding any permanent deformation. So, the formula for shearing strain is revisited. This formula is multiplied by the modulus of rigidity, and then Hooke's Law for the shearing stress and strain is applied. As a result, the equation for shearing stress in a shaft can be derived.
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Deformation in a Circular Shaft01:10

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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...
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When a mechanic tries to remove a hex nut with a wrench, it is easier if the force is applied at the farthest end of the wrench handle. The lever arm is the distance from the pivot point (the hex nut in this case) to the person’s hand. If this distance is large, the torque is higher. Only the component of the force perpendicular to the lever arm contributes to the torque. Therefore, pushing the wrench perpendicular to the lever arm is more advantageous. If multiple people apply force to...
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Un nuevo sensor de par de rigidez variable con resolución ajustable

Zhongyuan Mao1, Yuanchang Zhong1, Xuehui Zhao1

  • 1School of Electrical Engineering, Chongqing University, Chongqing 400044, China.

Micromachines
|August 28, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio introduce un nuevo sensor de par de rigidez variable que utiliza fluido magnetorreológico (MRF) para el ajuste dinámico de la resolución y el rango en máquinas giratorias. El diseño innovador ofrece una alta precisión y adaptabilidad para aplicaciones exigentes de medición de par.

Palabras clave:
El MRFrango ajustableresolución ajustableMétodo de modulación por tornilloSensor de torsiónresorte de torsión

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Área de la Ciencia:

  • Ingeniería mecánica
  • Tecnología de sensores
  • Ciencias de los materiales

Sus antecedentes:

  • El aumento de las demandas de resolución y alcance de los sensores de par en máquinas giratorias.
  • Las limitaciones de los sensores de par basados en el estirómetro tradicionales en la adaptación a diferentes condiciones de medición.

Objetivo del estudio:

  • Presentar un nuevo sensor de par de rigidez variable para el ajuste dinámico de la resolución y el rango.
  • Para hacer frente a los estrictos requisitos de medición del par en máquinas giratorias.
  • Para superar las limitaciones de las tecnologías de detección de par existentes.

Principales métodos:

  • Integración de resortes de torsión y fluido magnetorreológico (MRF) para una rigidez ajustable.
  • Utilizando campos magnéticos para alterar la tensión de corte MRF y por lo tanto la rigidez del sensor.
  • Desarrollo y validación de un modelo de rigidez utilizando el análisis de elementos finitos.
  • Implementación de un método basado en la modulación por tornillo para la medición de ángulos sin contacto.

Principales resultados:

  • Demostración del ajuste dinámico y continuo de la resolución y el rango del sensor de par.
  • Validación de la exactitud del modelo de rigidez.
  • Se logró una alta precisión de medición de ángulo sin contacto y se resolvieron los problemas de excentricidad.
  • Evaluación experimental que muestra una excelente linealidad, histeresis y repetibilidad del prototipo del sensor.

Conclusiones:

  • El nuevo sensor de par de rigidez variable satisface efectivamente las demandas de resolución y rango adaptables en máquinas giratorias.
  • La combinación de MRF y muelles de torsión ofrece un avance significativo sobre los sensores de par tradicionales.
  • La tecnología de sensores propuesta es prometedora para aplicaciones de medición de par de alta precisión.