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相关概念视频

Types Of Transformers01:16

Types Of Transformers

1.6K
Transformers can provide desired voltages to a circuit by modifying the number of turns in the secondary windings.
If the ratio of the number of turns in the secondary winding to that of the primary winding is greater than one, then the transformer is said to be a step-up transformer. In a step-up transformer, the voltage at the secondary winding is greater than the voltage applied at the primary winding.
However, if this ratio is less than one, the transformer is said to be a step-down...
1.6K
End Point Prediction: Gran Plot01:07

End Point Prediction: Gran Plot

1.5K
A Gran plot is used to predict the equivalence volume or endpoint of a potentiometric or acid-base titration without reaching the endpoint. Typically, titration data is collected as a function of the titrant's volume up to a point less than the equivalence volume and then transformed into a linear format. The straight line is extended to the x-axis, indicating the necessary titrant volume to achieve the equivalence point.
For potentiometric titration, the Gran plot is created by plotting...
1.5K
Multi-input and Multi-variable systems01:22

Multi-input and Multi-variable systems

544
Cruise control systems in cars are designed as multi-input systems to maintain a driver's desired speed while compensating for external disturbances such as changes in terrain. The block diagram for a cruise control system typically includes two main inputs: the desired speed set by the driver and any external disturbances, such as the incline of the road. By adjusting the engine throttle, the system maintains the vehicle's speed as close to the desired value as possible.
In the absence of...
544
Transformers with Off-Nominal Turns Ratios01:25

Transformers with Off-Nominal Turns Ratios

739
In scenarios involving parallel transformers with disparate ratings, developing per-unit models requires accommodating off-nominal turns ratios. This situation arises when the selected base voltages are not proportional to the transformer’s voltage ratings. Consider a transformer where the rated voltages are related by the term a. If the chosen voltage bases satisfy a relationship involving term b, term c is defined as the ratio of these bases. This ratio is then substituted into the...
739
Per-Unit Sequence Models01:26

Per-Unit Sequence Models

527
An ideal Y-Y transformer, grounded through neutral impedances, displays per-unit sequence networks akin to those of a single-phase ideal transformer when subjected to balanced positive- or negative-sequence currents. These currents do not produce neutral currents, and their associated voltage drops.
Zero-sequence currents, which are identical in magnitude and phase, generate a neutral current, resulting in voltage drops across the neutral impedance and the low-voltage winding. If the...
527
Multimachine Stability01:25

Multimachine Stability

698
Multimachine stability analysis is crucial for understanding the dynamics and stability of power systems with multiple synchronous machines. The objective is to solve the swing equations for a network of M machines connected to an N-bus power system.
In analyzing the system, the nodal equations represent the relationship between bus voltages, machine voltages, and machine currents. The nodal equation is given by:
698

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相关实验视频

Updated: Jun 7, 2026

A Rapid Method for Modeling a Variable Cycle Engine
04:58

A Rapid Method for Modeling a Variable Cycle Engine

Published on: August 13, 2019

PRformer:用于多变量时间序列预测的金字塔循环变压器.

Yongbo Yu1, Weizhong Yu1, Feiping Nie1

  • 1School of Artificial Intelligence, OPtics and ElectroNics (iOPEN) and the Key Laboratory of Intelligent Interaction and Applications (Ministry of Industry and Information Technology), Northwestern Polytechnical University, Xi'an, 710072, Shaanxi, PR China.

Neural networks : the official journal of the International Neural Network Society
|June 28, 2025
PubMed
概括

变压器模型在时间序列顺序上扎. 我们的新金字塔RNN嵌入式 (PRE) 增强了变压器,可以更好地预测时间序列,改善长时间回顾窗口的性能.

关键词:
多尺度表示学习学习多尺度表示学习.一个金字塔式循环变压器.时间序列预测时间序列预测

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Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator
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Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator

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High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition
05:11

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition

Published on: June 27, 2025

相关实验视频

Last Updated: Jun 7, 2026

A Rapid Method for Modeling a Variable Cycle Engine
04:58

A Rapid Method for Modeling a Variable Cycle Engine

Published on: August 13, 2019

Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator
06:04

Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator

Published on: February 14, 2025

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition
05:11

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition

Published on: June 27, 2025

科学领域:

  • 人工智能的人工智能
  • 机器学习 机器学习
  • 时间序列分析时间序列分析

背景情况:

  • 变压器模型虽然强大,但由于它们的自我注意力机制,缺乏固有的时间顺序意识.
  • 依赖定位嵌入限制了变压器在时间序列预测中的有效性,特别是在扩展的回顾窗口.
  • 现有的方法难以捕捉复杂的时间依赖关系,这对于准确的预测至关重要.

研究的目的:

  • 开发一种改进的方法,在变压器模型中编码时间顺序,用于时间序列预测.
  • 为了增强时间序列的表示,特别是对于更长的回顾窗口.
  • 将一种新的嵌入技术与变压器架构集成,以获得卓越的预测性能.

主要方法:

  • 引入了金字塔RNN嵌入式 (PRE),结合了金字塔1D卷积层和循环神经网络 (RNN).
  • PRE构建了维护时间顺序的多尺度卷积特征,并学习了顺序顺序敏感的表示.
  • 集成PRE与标准变压器编码器,以创建用于多变量时间序列预测的PRformer模型.

主要成果:

  • 与标准的变压器方法相比,PRformer模型显示了显著的性能提升.
  • 在各种真实世界时间序列数据集上取得了最先进的结果.
  • 有效地利用了更长的回顾窗口,展示了拟议的时间表示的稳定性.

结论:

  • 拟议的金字塔RNN嵌入 (PRE) 有效地解决了标准变压器模型的时间顺序限制.
  • 集成PRE显著提高了变压器在时间序列预测任务中的性能,特别是长时间回顾数据.
  • 强大的时间表示对于最大限度地发挥变压器架构在预测建模中的潜力至关重要.