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Related Concept Videos

Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

571
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...
571
Design of Transmission Shafts - Stress Analysis01:15

Design of Transmission Shafts - Stress Analysis

564
Designing a transmission shaft requires a thorough understanding of the stresses induced by bending moments and torques, especially in systems where power is transferred through gears. These forces create force-couple systems at the centers of the shaft's cross-sections, leading to both transverse and torsional loading. Although shearing stresses from transverse loads are typically smaller than those from torques and are often overlooked, the significant normal stresses from these loads...
564
Design of Transmission Shafts01:16

Design of Transmission Shafts

561
The design of a transmission shaft is governed by two primary specifications: the power it transmits and its rotational speed. These parameters guide the selection of the shaft's material and cross-sectional dimensions, ensuring that the material's maximum shearing stress remains within the elastic limit while transmitting the desired power at the given speed. The system's power is intrinsically linked to the applied torque. The torque applied to the shaft can be calculated by reconfiguring the...
561
Circular Shaft - Stresses in Linear Range01:13

Circular Shaft - Stresses in Linear Range

466
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.
466
Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

329
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...
329
Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

341
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...
341

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A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump
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Simulation and Optimization of SNAP-Taper Coupling System in Displacement Sensing.

Jian Chen1, Yongchao Dong1, Han Wang1

  • 1State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment, Guangdong Provincial Key Laboratory of Micro-Nano Manufacturing Technology and Equipment, Mechanical and Electrical Engineering, Guangdong University of Technology, Guangzhou 510006, China.

Sensors (Basel, Switzerland)
|April 30, 2021
PubMed
Summary

This study introduces a novel Surface Nanoscale Axial Photonics (SNAP) displacement sensor. It offers a wider range and higher resolution than traditional whispering gallery mode (WGM) microcavity sensors.

Keywords:
SNAPdisplacement sensingresonance spectrumtransmittance

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Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Sensor Technology

Background:

  • Whispering gallery mode (WGM) microcavities are used for displacement sensing.
  • Traditional WGM displacement sensing has limitations.
  • A new approach is needed for improved performance.

Purpose of the Study:

  • To propose a novel displacement sensing scheme using Surface Nanoscale Axial Photonics (SNAP).
  • To achieve a wide-range and high-resolution displacement sensor.
  • To analyze the transmittance of multiple axial modes for enhanced sensing.

Main Methods:

  • Analyzing resonance spectrum surface plots to determine optimal coupling parameters.
  • Utilizing Surface Nanoscale Axial Photonics (SNAP) resonator.
  • Adjusting sensitivity threshold and number of modes for theoretical realization.

Main Results:

  • A novel displacement sensing scheme based on SNAP is proposed.
  • Theoretical realization of high-sensitivity and wide-range displacement sensing.
  • Identification of ideal coupling parameters and effective resonance volume (ERV).

Conclusions:

  • The SNAP resonator offers a promising alternative for displacement sensing.
  • This scheme overcomes limitations of traditional WGM sensors.
  • Further research on SNAP resonators can advance various sensing applications.