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Related Concept Videos

Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
Design of Transmission Shafts01:16

Design of Transmission Shafts

The design of a transmission shaft is governed by two primary specifications: the power it transmits and its rotational speed. These parameters guide the selection of the shaft's material and cross-sectional dimensions, ensuring that the material's maximum shearing stress remains within the elastic limit while transmitting the desired power at the given speed. The system's power is intrinsically linked to the applied torque. The torque applied to the shaft can be calculated by reconfiguring the...
Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
Cylinders in Three-Dimensional Space01:28

Cylinders in Three-Dimensional Space

A cylindrical surface is generated when a two-dimensional profile curve is translated along a straight line in three-dimensional space. The translated copies of the curve form a surface composed of parallel rulings, each oriented in the same fixed direction. This construction allows many three-dimensional forms to be described using relatively simple planar equations.In Cartesian coordinates, a cylindrical surface is often recognized by an equation that omits one of the three variables. For...
Sequence Networks of Rotating Machines01:24

Sequence Networks of Rotating Machines

A Y-connected synchronous generator, grounded through a neutral impedance, is designed to produce balanced internal phase voltages with only positive-sequence components. The generator's sequence networks include a source voltage that is exclusively in the positive-sequence network. The sequence components of line-to-ground voltages at the generator terminals illustrate this configuration.
Zero-sequence current induces a voltage drop across the generator's neutral impedance and other...
Transmission Shafts: Problem Solving01:09

Transmission Shafts: Problem Solving

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.
Next, use bending moment diagrams for the shaft to...

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Methods for Measuring the Orientation and Rotation Rate of 3D-printed Particles in Turbulence
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High-dimensional information encoding with low-divergence rotating gear vortex beams.

Long Zhu, Yangzong Ao, Jinghong Wang

    Optics Express
    |June 11, 2026
    PubMed
    Summary
    This summary is machine-generated.

    We introduce the rotating gear vortex beam (RGVB), a novel structured light field for free-space optical (FSO) communication. RGVBs offer significantly higher encoding capacity and improved turbulence resilience compared to traditional Laguerre-Gaussian beams.

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    Area of Science:

    • Optical Communications
    • Structured Light Fields
    • Free-Space Optics (FSO)

    Background:

    • Vortex beams with orbital angular momentum (OAM) are crucial in FSO communication due to their helical phase structures.
    • Expanding light field degrees of freedom is key for enhancing communication capacity.

    Purpose of the Study:

    • To propose and investigate a novel structured light field, the rotating gear vortex beam (RGVB).
    • To evaluate the RGVB's potential for high-dimensional information encoding and its performance in atmospheric turbulence.

    Main Methods:

    • Constructing the RGVB through mode superposition of two-dimensional Laguerre-Gaussian (LG) beams.
    • Analyzing the RGVB's propagation characteristics and intensity distribution.
    • Performing numerical simulations to compare encoding capacity with LG beams.
    • Validating performance by transmitting grayscale images through simulated atmospheric turbulence.

    Main Results:

    • The RGVB exhibits a unique rotating gear intensity distribution and low divergence.
    • RGVBs possess four tunable parameters, enabling high-dimensional encoding with 204 available modes (3.19x more than LG beams).
    • RGVBs demonstrate superior turbulence resilience, achieving up to 25.14% higher recognition accuracy than LG beams in strong turbulence.

    Conclusions:

    • RGVBs offer significantly enhanced encoding capacity due to their tunable parameters.
    • The RGVB shows remarkable resilience to atmospheric turbulence, outperforming conventional LG beams.
    • RGVBs hold great potential for future high-capacity and robust free-space optical communication systems.