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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

2.5K
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
2.5K
Transformation of Plane Strain01:12

Transformation of Plane Strain

472
When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
472
Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

927
The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
927

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Production of a Strain-Measuring Device with an Improved 3D Printer
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Shoulder Angle Measurement by Optimized Strain Sensor Placement on Flexible Printed Circuit.

Daisuke Goto, Kensuke Oshima, Kunihiro Ogata

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |December 3, 2025
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    Summary

    This study introduces a new wearable sensor prototype for accurate scapular motion tracking. Combining clavicle, shoulder, and scapula sensors provides the most precise measurements for sportswear applications.

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    Area of Science:

    • Biomechanics and Wearable Technology
    • Sports Science and Engineering

    Background:

    • Accurate measurement of scapular motion is crucial for understanding upper limb biomechanics.
    • Existing methods for motion capture can be cumbersome or lack integration into sportswear.
    • Flexible printed circuits offer potential for novel wearable sensor integration.

    Purpose of the Study:

    • To develop a novel wearable sensor prototype for scapular motion analysis.
    • To optimize sensor placement on sportswear for enhanced measurement accuracy.
    • To evaluate the accuracy of scapular motion measurement using different sensor configurations.

    Main Methods:

    • A new wearable device featuring a flexible printed circuit with 30 strain sensors was developed using screen printing technology.
    • Sensors were strategically placed on sportswear covering the clavicle, shoulder, and scapula regions.
    • Four subjects performed standardized basic and combined upper limb motion tasks while wearing the prototype.

    Main Results:

    • Seven different sensor arrangement models were evaluated based on combinations of clavicle, shoulder, and scapula sensor groups.
    • Estimation accuracy was quantified using Normalized Root Mean Square Error (NRMSE) and Pearson correlation coefficient (ρ).
    • The model incorporating sensors from all three groups (clavicle, shoulder, and scapula) demonstrated superior accuracy compared to other configurations.

    Conclusions:

    • The developed wearable sensor prototype shows promise for accurate scapular motion measurement.
    • An optimized sensor arrangement, utilizing all three sensor groups, is essential for achieving high measurement accuracy.
    • This technology has potential applications in sports science, rehabilitation, and ergonomic assessments.