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Related Concept Videos

Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

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In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
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Design of Transmission Shafts - Stress Analysis01:15

Design of Transmission Shafts - Stress Analysis

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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...
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Stresses under Combined Loadings01:23

Stresses under Combined Loadings

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When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
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Relation Between the Distributed Load and Shear01:23

Relation Between the Distributed Load and Shear

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Understanding the relationship between the distributed load and shear force in structural analysis is crucial for analyzing beams subjected to various loading conditions. Consider the case of a beam experiencing a distributed load, two concentrated loads, and a couple moment.
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Transmission Shafts: Problem Solving01:09

Transmission Shafts: Problem Solving

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Designing a solid shaft that transmits power from a motor to a machine tool involves a series of calculations to ensure the shaft can withstand the stresses applied by bending moments and torques. First, calculate the torque exerted on the gear, considering the power transmitted by the shaft and its rotational speed. Following this, compute the tangential forces acting on the gears, which directly relate to the torque and the gear radius.
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Normal and Shear Force01:14

Normal and Shear Force

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When a beam is subjected to different loads, such as weight, pressure, or other external forces, internal forces are generated within the beam. These forces can have a significant impact on the overall stability and strength of the structure. Engineers use various methods to analyze and determine the magnitude and direction of these internal forces. One common technique used to determine internal forces in beams is the method of sections. This method involves considering an imaginary point or...
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Simulation of Human-induced Vibrations Based on the Characterized In-field Pedestrian Behavior
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Development of Shear Force/Vertical Load Estimation Method Using Vibration Measurement for Shoe Compatibility

Kosei Higuchi, Kota Ogikubo, Jun Inoue

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |March 5, 2025
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    Summary

    Diabetic patients need better shoe fitting. This study developed a system using vibration analysis and machine learning to objectively assess footwear suitability, improving accuracy for shear force and vertical load detection.

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    Area of Science:

    • Biomedical Engineering
    • Materials Science
    • Orthopedics

    Background:

    • Rising global diabetes prevalence necessitates effective diabetic footwear management.
    • Current methods for determining appropriate footwear are often subjective and rely on trial-and-error.
    • Objective evaluation systems are crucial for preventing diabetic foot complications.

    Purpose of the Study:

    • To develop a novel system for objectively evaluating shoe suitability for diabetic patients.
    • To measure vibrations between sock and shoe insole during walking to assess fit.
    • To utilize machine learning for classifying footwear fit based on vibration data.

    Main Methods:

    • Reproduced shear force within a shoe environment.
    • Measured vibrations using a piezoelectric wire sensor.
    • Extracted frequency and time-domain features from vibration signals.
    • Employed a support vector machine (SVM) with 10-fold cross-validation for classification.
    • Analyzed vibration data in relation to shear force and vertical load.

    Main Results:

    • Achieved a maximum classification accuracy of 81.7% for shear force.
    • Attained a maximum classification accuracy of 91.0% for vertical load.
    • Demonstrated improved classification accuracy compared to previous studies.

    Conclusions:

    • The developed vibration-based system offers an objective method for evaluating shoe suitability.
    • Machine learning effectively classifies footwear fit based on measured vibrations.
    • This technology has the potential to enhance diabetic footwear selection and reduce complications.