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Related Concept Videos

Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

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An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque...
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Angle of Twist - Elastic Range01:13

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Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
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Torsion of Noncircular Members01:16

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Circular shafts undergoing torsional stress maintain their cross-sectional integrity due to their axisymmetric nature. This symmetry ensures an even distribution of stress, allowing the shaft to withstand torsion without distorting. In contrast, square bars, lacking this axial symmetry, experience significant distortion across their cross-sections when subjected to torsion, with the exception of along their diagonals and at lines connecting midpoints. A detailed examination of a cubic element...
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Bending and torsional moments are two fundamental concepts in structural engineering. They play an important role in understanding the behavior of materials and structures under different loading conditions.
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The shaft PQ is subjected to a twisting force when equal and opposite torques are applied on either side. A section that cuts perpendicular to the shaft's axis at any arbitrary point R is examined to understand this. When the free-body diagram of the QR segment is analyzed, it reveals the shearing forces exerted by the PR portion onto the QR segment as the shaft experiences twisting.
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Method to Measure Tone of Axial and Proximal Muscle
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Quasi-distributed twist/torsion sensor.

Vedran Budinski, Denis Donlagic

    Optics Express
    |November 19, 2016
    PubMed
    Summary
    This summary is machine-generated.

    A novel fiber-optic sensor system enables quasi-distributed in-line twist and rotation measurements. This innovative sensor achieves high resolution and low crosstalk using standard single-mode fiber and in-line polarizers.

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    Area of Science:

    • Optoelectronics
    • Fiber Optic Sensing
    • Metrology

    Background:

    • Accurate measurement of twist and rotation is crucial in various industrial applications.
    • Existing sensing technologies often face limitations in distributed sensing capabilities and resolution.

    Purpose of the Study:

    • To present a novel fiber-optic quasi-distributed in-line twist/rotation sensor.
    • To demonstrate a system capable of individual interrogation of multiple sensing segments.

    Main Methods:

    • Utilizing a polarization-maintaining lead-in fiber and series of in-line fiber polarizers with semi-reflective mirrors.
    • Interconnecting polarizers with standard single-mode fiber to create multiple twist/rotation sensitive segments.
    • Employing optical time domain reflectometry (OTDR) for individual segment interrogation based on polarization state changes.

    Main Results:

    • Demonstrated a quasi-distributed sensing system with nine sensing segments.
    • Achieved a twist/rotational resolution better than 0.3 degrees.
    • Observed low cross-talk between sensing segments.

    Conclusions:

    • The developed fiber-optic sensor offers a robust and efficient solution for quasi-distributed twist/rotation sensing.
    • The system's design leverages simple optoelectronic components for cost-effectiveness and ease of implementation.
    • The high resolution and low cross-talk performance make it suitable for demanding applications.