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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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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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An object undergoing circular motion, like a race car, is accelerating because it is changing the direction of its velocity. This centrally directed acceleration is called centripetal acceleration. This acceleration acts along the radius of the curved path (thus is also referred to as radial acceleration).
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Plastic Deformation in Circular Shafts01:20

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A rigid body's rotation around a fixed axis makes every point within it trace a circular path around a specific line or point. The term given to this type of spinning is defined by the angular position, symbolized by the angle θ. This angle is gauged from a static reference line to the revolving object. From this angular position, any variation is referred to as angular displacement, denoted by dθ. The extent of this displacement can be calculated in degrees, radians, or...
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Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System
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A Microfluidic Rotational Motor Driven by Circular Vibrations.

Suzana Uran1, Božidar Bratina1, Riko Šafarič1

  • 1Laboratory for Cognitive Systems in Mechatronics, Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroška c. 46, SI-2000 Maribor, Slovenia.

Micromachines
|November 28, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a micro-motor powered by low-frequency vibrations. Piezoelectric actuators create a stable water stream to rotate a micro-rotor, achieving controlled speeds.

Keywords:
circular vibrationsmicro-sized rotational motormicro-sized vortices in a water dropletmicrofluidicspiezoelectric actuators

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Area of Science:

  • Micro-robotics
  • Fluid dynamics
  • Piezoelectric actuators

Background:

  • Powering micro-machines requires efficient energy transfer methods.
  • Vibrational energy is a potential source for micro-scale mechanical movement.
  • Existing methods face challenges in precise energy delivery and control.

Purpose of the Study:

  • To develop a micro-motor driven by low-frequency circular vibrations.
  • To investigate the theoretical principles of generating stable liquid streams for rotational motion.
  • To demonstrate a practical application of vibrational energy for micro-machine actuation.

Main Methods:

  • Utilized two piezoelectric actuators to generate low-frequency (200-700 Hz) circular vibrations.
  • Employed a water droplet (1 mm diameter) as the medium for energy transfer.
  • Designed and tested a micro-rotor (350 µm diameter) interacting with a vibrated pillar (80 µm diameter).
  • Incorporated 3D printed mechanical amplifiers to enhance vibration amplitude up to 20 µm.

Main Results:

  • Achieved a time-stable circular stream of the water medium around the pillar.
  • Successfully rotated the micro-rotor using the generated fluidic energy.
  • Demonstrated controlled bidirectional rotation of the micro-rotor from -20 rad/s to +26 rad/s.
  • Overcame disturbances from the vibrating plate to maintain stable operation.

Conclusions:

  • Low-frequency circular vibrations can effectively power micro-scale rotational devices.
  • Stable fluid streams are crucial for efficient energy transfer in micro-actuation systems.
  • This vibrational micro-motor offers a novel approach for powering micro-machines with controlled motion.