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Automatic Laser-based Geometry Capture for Finite Element Analysis of Weld Beads
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Dynamic structured-light measurement for wheel diameter based on the cycloid constraint.

Zheng Gong, Junhua Sun, Guangjun Zhang

    Applied Optics
    |February 3, 2016
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a new method for measuring train wheel diameter using structured-light and cycloid constraints. The novel approach offers improved precision and stability compared to traditional circle fitting, enhancing train safety and comfort.

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    Area of Science:

    • Mechanical Engineering
    • Metrology
    • Railway Engineering

    Background:

    • Accurate train wheel diameter measurement is crucial for operational safety and passenger comfort.
    • Traditional circle fitting methods struggle with noisy data and limited contact points, impacting measurement reliability.

    Purpose of the Study:

    • To develop a more precise and robust method for measuring train wheel diameter.
    • To overcome the limitations of traditional circle fitting in the presence of noise and limited data points.

    Main Methods:

    • A structured-light measurement technique was employed, utilizing the cycloid constraint.
    • The train wheel was measured twice during operation to gather a wide distribution of contact points.
    • The cycloid constraint was used to integrate these contact points into a single circle for diameter calculation.

    Main Results:

    • Simulations demonstrated superior precision and stability against 3D reconstruction noise and wheel out-of-roundness compared to traditional methods.
    • Physical experiments validated the method's precision and robustness in real-world conditions.

    Conclusions:

    • The proposed structured-light measurement with cycloid constraint offers a significant advancement in train wheel diameter assessment.
    • This method enhances measurement accuracy and reliability, contributing to improved train safety and comfort standards.