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Deflection of a Beam01:19

Deflection of a Beam

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Accurately determining beam deflection and slope under various loading conditions in structural engineering is crucial for ensuring safety and structural integrity. Singularity functions offer a streamlined approach to analyzing beams, especially when multiple loading functions complicate the bending moment equation.
Singularity functions, described in an earlier lesson, are powerful mathematical tools that represent discontinuities within a function commonly encountered in structural loading...
365

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    Area of Science:

    • Optics and Photonics
    • Communication Engineering
    • Materials Science

    Background:

    • Visible Light Communication (VLC) offers high bandwidth and security potential.
    • Current VLC systems face challenges in receiver tracking and maintaining secure connections.
    • Beam steering is crucial for directing light to mobile receivers in VLC networks.

    Purpose of the Study:

    • To design, manufacture, and implement a 3D-printed lens scanner for beam steering in VLC.
    • To enhance VLC security by enabling receiver tracking via face recognition.
    • To evaluate the performance and secrecy capacity of the developed beam steering system.

    Main Methods:

    • Utilized fused deposition modeling (FDM) with polylactic acid (PLA) for low-cost 3D printing of the scanner.
    • Employed electromagnetic actuation for lens frame movement in two orthogonal directions.
    • Integrated the 3D-printed actuator onto a miniaturized VLC test bed for characterization and demonstration.
    • Implemented face-recognition feedback for real-time target tracking and beam steering.

    Main Results:

    • Successfully manufactured and implemented a compact (5cm x 5cm) 3D-printed lens scanner.
    • Characterized the voltage-dependent beam displacement in the lateral plane.
    • Demonstrated effective beam steering towards a moving target using face-recognition feedback.
    • Calculated secrecy capacity, showing favorable comparison with jamming and spatial modulation techniques.

    Conclusions:

    • The 3D-printed lens scanner provides a low-cost, effective solution for beam steering in VLC applications.
    • Face-recognition-guided beam steering significantly enhances VLC security by focusing light on legitimate receivers.
    • The system allows receiver mobility while maintaining secure, focused communication, with potential for larger room applications.