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Related Concept Videos

Bending01:10

Bending

273
Pure bending is a fundamental concept in structural mechanics, essential for understanding how materials deform under symmetrical loads without direct forces. Pure bending occurs when prismatic members, such as beams, are subjected to equal and opposite moments that induce bending. The phenomenon is crucial as it allows for predicting stress distributions without the influence of axial or shear forces.
In pure bending, the bending stress in a beam is calculated based on the bending moment and...
273
Unsymmetric Bending - Angle of Neutral Axis01:15

Unsymmetric Bending - Angle of Neutral Axis

308
Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal...
308
Unsymmetric Bending01:18

Unsymmetric Bending

331
Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The...
331

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Related Experiment Video

Updated: Jul 4, 2025

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
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In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty

Published on: May 5, 2023

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Bending Angle Sensor Based on Double-Layer Capacitance Suitable for Human Joint.

Daisuke Goto1, Yusuke Sakaue2, Tatsuya Kobayashi1

  • 1Graduate School of Sports and Health ScienceRitsumeikan University Kyoto 603-8577 Japan.

IEEE Open Journal of Engineering in Medicine and Biology
|January 26, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a novel double-layer capacitive bending angle sensor for monitoring joint angles during cycling. The sensor demonstrates high accuracy and practicality for evaluating knee joint angles in real-world exercise scenarios.

Keywords:
Cyclinghysteresisknee jointrehabilitationwearable sensor

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Area of Science:

  • Biomedical Engineering
  • Wearable Technology
  • Sports Science

Background:

  • Accurate monitoring of joint angles is crucial for analyzing biomechanics during cycling exercises.
  • Existing methods for joint angle measurement can be cumbersome or lack real-time feedback.
  • Developing reliable and wearable sensors is essential for objective performance evaluation.

Purpose of the Study:

  • To develop and validate a novel bending angle sensor utilizing double-layer capacitance.
  • To assess the sensor's performance in measuring joint angles during cycling exercises.
  • To provide a practical tool for quantitative evaluation of knee joint angles.

Main Methods:

  • A bending angle sensor based on double-layer capacitive principles was developed.
  • The sensor underwent rigorous testing, including stretching, bending, and cycling tests.
  • Performance was validated against optical motion capture for accuracy assessment.

Main Results:

  • The sensor exhibited minimal capacitance difference changes during stretching.
  • In bending tests, the sensor achieved 8.0% hysteresis and 3.1° Root Mean Square Error (RMSE).
  • Cycling tests with human subjects showed RMSEs ranging from 4.7° to 7.0° when worn with leggings.

Conclusions:

  • The developed double-layer capacitive bending angle sensor is a practical tool for monitoring joint angles.
  • The sensor offers quantitative and observational evaluation capabilities for knee joint angles during cycling.
  • This technology has potential applications in sports science, rehabilitation, and performance analysis.