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相关概念视频

The Swing Equation01:21

The Swing Equation

1.3K
The Swing Equation is a fundamental tool in power system dynamics, especially for analyzing the behavior of generating units like three-phase synchronous generators. This equation emerges from applying Newton's second law to the rotor of a generator, encompassing factors such as inertia, angular acceleration, and the interplay between mechanical and electrical torques.
In a steady-state operation, the mechanical torque (Τm) supplied to the generator is balanced by the electrical torque (Τe)...
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Typical Model Studies01:30

Typical Model Studies

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Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
603
Generation of Three-Phase Voltage01:21

Generation of Three-Phase Voltage

726
A three-phase AC generator has a rotor with a rotating magnet placed within the stator mounted with the stationary three-phase winding to generate three-phase voltages via mutual induction. These windings are evenly distributed around the inner circumference of the stator and are arranged 120 electrical degrees apart. Three-phase stator windings consist of three separate coils or groups of coils, known as phases, each connected in Y (star) configuration or Delta configuration.
As the rotor...
726
Turbine-Governor Control01:17

Turbine-Governor Control

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Turbine-governor control is crucial for maintaining power system stability by balancing turbine mechanical power output with electrical load demand. This mechanism ensures that generator frequency and rotor speed are within acceptable limits during load variations. Turbine-generator units store kinetic energy due to their rotating masses; this energy is released to meet the load requirement when the load increases. The electrical torque of turbines rises to meet the demand, whereas the...
899
Turbulent Flow01:24

Turbulent Flow

632
Turbulent flow is characterized by unpredictable fluctuations in velocity and pressure, which result in a chaotic fluid movement distinct from the orderly patterns of laminar flow. While laminar flow is governed by smooth, parallel layers with minimal mixing, turbulent flow exhibits highly irregular, three-dimensional patterns. This behavior arises due to instabilities in the fluid's velocity profile, and amplifies as the flow velocity increases. Minor disturbances, known as turbulent...
632
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

755
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
755

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相关实验视频

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Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
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对于一般海洋流的阶段屏幕生成方法.

Guangqing Liu, Xiang Yi, Mingjian Cheng

    Journal of the Optical Society of America. A, Optics, image science, and vision
    |December 18, 2025
    PubMed
    概括

    在海洋流中精确模拟光传播需要精确的相屏幕 (PSs). 结合频域和空间域方法的混合方法优化PS生成,提高光波传播研究的准确性.

    科学领域:

    • 海洋光学 海洋光学
    • 流模拟的流模型.
    • 计算物理学的计算物理.

    背景情况:

    • 海洋流会通过折射率波动引起光波扭曲.
    • 分步方法用于模拟流媒体中的光传播是常见的.
    • 精确的阶段屏幕 (PS) 生成对于分割步骤方法的有效性至关重要.

    研究的目的:

    • 开发一种精确的方法,用于产生阶段屏幕 (PSs),用于海洋流模拟.
    • 为了提高在海水中光波传播的数值模拟的准确性.

    主要方法:

    • 利用一般海洋动荡折射指数空间电力规律光谱 (RISPS) 来创建PSs.
    • 采用混合实现,结合PWD (Paulson,Wu和Davis) 的频域方法.
    • 集成的基于Zernike多项式的空间域分解用于PS生成.

    主要成果:

    • 证明了结合频率和空间域方法的混合方法可以为PS生成提供最佳的准确性.
    • 展示了混合方法在模拟光波传播通过海洋动荡的有效性.

    结论:

    • 基于多项式的混合PWD和Zernike方法在海洋流模拟中产生相屏幕时提供了卓越的准确性.

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  • 这种优化的PS生成对于促进对海洋环境中光传播的理解至关重要.