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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 Without Slipping01:09

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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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Rolling Resistance: Problem Solving01:17

Rolling Resistance: Problem Solving

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Rolling resistance, also known as rolling friction, is the force that resists the motion of a rolling object, such as a wheel, tire, or ball, when it moves over a surface. It is caused by the deformation of the object and the surface in contact with each other, as well as other factors like internal friction, hysteresis, and energy losses within the materials. Rolling resistance opposes the object's motion, requiring additional energy to overcome it and maintain movement. In practical...
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Equation of Motion: General Plane motion - Problem Solving01:16

Equation of Motion: General Plane motion - Problem Solving

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Consider a lawn roller with a mass of 100 kg, a radius of 0.2 meters, and a radius of gyration of 0.15 meters. A force of 200 N is applied to this roller, angled at 60 degrees from the horizontal plane. What will be the angular acceleration of the lawn roller?
The friction between the roller and the ground is characterized by two coefficients. The static friction coefficient is 0.15, while the kinetic friction coefficient is 0.1. These values are crucial in understanding the interaction between...
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Rolling Resistance01:21

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When a solid cylinder rolls steadily on a rigid surface, the normal force applied by the surface on the cylinder is perpendicular to the tangent at the contact point. However, since no materials are entirely rigid, the surface's reaction to the cylinder involves a range of normal pressures.
For instance, imagine a hard cylinder rolling on a comparatively soft surface. The cylinder's weight compresses the surface beneath it. As the cylinder moves, the material in front of it slows down due to...
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Relative Motion Analysis - Velocity01:24

Relative Motion Analysis - Velocity

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A stroke engine has a slider-crank mechanism that 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.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
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Video Experimental Relacionado

Updated: Jan 13, 2026

Modeling and Experimental Analysis of the Single-Shaft Coaxial Motor-Pump Assembly in Electrohydrostatic Actuators
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Un nuevo principio de actuación lineal basado en rodadura para movimiento bidireccional suave

Dunfa Long1, Fujun Wang1, Chengzhi Hu2

  • 1Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, School of Mechanical Engineering, Tianjin University, Tianjin 300072, China.

Cyborg and bionic systems (Washington, D.C.)
|January 12, 2026
PubMed
Resumen

Un nuevo principio de actuación de rodadura (RDP) mejora la consistencia del movimiento del actuador de deslizamiento utilizando un solo PZT. Este RDP logra una alta linealidad y bajas diferencias de velocidad, permitiendo aplicaciones como instrumentos microquirúrgicos compatibles con RM.

Palabras clave:
actuador de deslizamientoprincipio de actuación de rodaduramovimiento bidireccionalinstrumentos microquirúrgicoscompatible con RM

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Área de la Ciencia:

  • Ingeniería Mecánica
  • Robótica
  • Ingeniería Biomédica

Sus antecedentes:

  • Los actuadores de deslizamiento son cruciales para el control preciso del movimiento.
  • Los diseños existentes a menudo enfrentan desafíos con la consistencia del movimiento y la linealidad.
  • Se necesitan actuadores de alta precisión para aplicaciones avanzadas como la microcirugía.

Objetivo del estudio:

  • Introducir un novedoso principio de actuación de rodadura (RDP) para actuadores de deslizamiento.
  • Mejorar la consistencia del movimiento y la linealidad en los actuadores.
  • Desarrollar un instrumento microquirúrgico compatible con RM que utilice el RDP.

Principales métodos:

  • Desarrolló un novedoso principio de actuación de rodadura (RDP) inspirado en mecanismos de piñón y cremallera.
  • Implementó un actuador lineal de deslizamiento con un mecanismo flexible de trapecio isósceles (ITFM).
  • Se realizó una verificación experimental en frecuencias altas y bajas, incluido el diseño de optimización del ITFM.

Principales resultados:

  • El actuador RDP demostró una excelente consistencia de movimiento (diferencia de velocidad del 1,96 % a 10 Hz) y linealidad (0,99969).
  • A 560 Hz, se mantuvo una alta linealidad (0,99999) con una relación de diferencia de velocidad del 7,54 %.
  • Se desarrolló y demostró con éxito un prototipo de instrumento microquirúrgico compatible con RM.

Conclusiones:

  • El novedoso RDP mejora significativamente la consistencia del movimiento y la linealidad en los actuadores de deslizamiento.
  • El RDP es adecuado para aplicaciones de alta precisión, incluidos instrumentos quirúrgicos de RM intraoperatorios.
  • La tecnología de actuadores desarrollada es prometedora para herramientas microquirúrgicas avanzadas.