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相关概念视频

The Carnot Cycle01:30

The Carnot Cycle

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Converting work to heat is an irreversible process, and the purpose of a heat engine is to reverse the effect partially. Heat engines aim to increase the efficiency of the reversal, that is, maximize the work retrieved from heat. If the efficiency of a heat engine were 100%, it would imply reversing the process completely without introducing any other effect. Thus, it would violate the second law of thermodynamics.
What could be the theoretical limit to the efficiency of a heat engine? The...
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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Multimachine Stability01:25

Multimachine Stability

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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:
197
Efficiency of The Carnot Cycle01:16

Efficiency of The Carnot Cycle

2.7K
The hypothetical Carnot cycle consists of an ideal gas subjected to two isothermal and two adiabatic processes. Since the internal energy of an ideal gas depends only on its temperature, which is the same before and after the completion of the Carnot cycle, there is no change in its internal energy. Hence, using the first law of thermodynamics, the total heat exchanged by the ideal gas equals the total work done. Thus, we can quantify the efficiency of the Carnot cycle via the heat exchanged...
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Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

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The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
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The Carnot Cycle and the Second Law of Thermodynamics01:20

The Carnot Cycle and the Second Law of Thermodynamics

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The Carnot engine works between two heat reservoirs of fixed temperatures. The Carnot cycle begs the following question: Is it possible to devise a heat engine that is more efficient than a Carnot engine between two fixed temperatures? The answer lies in designing a Carnot refrigerator.
Since the individual steps in a Carnot cycle can be reversed, the entire cycle is, thus, reversible. If a Carnot cycle is reversed, it becomes a Carnot refrigerator. It extracts heat Qc from a cold reservoir at...
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相关实验视频

Updated: Jul 24, 2025

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

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一个不可逆转的磁动力循环的四个目标优化.

Qingkun Wu1,2,3, Lingen Chen1,2,3, Yanlin Ge1,2,3

  • 1Institute of Thermal Science and Power Engineering, Wuhan Institute of Technology, Wuhan 430205, China.

Entropy (Basel, Switzerland)
|July 8, 2023
PubMed
概括

这项研究利用有限时间热力学和遗传算法优化了不可逆转的磁动力学循环. 多目标优化比单个目标的功率输出和效率优化方法产生更好的结果.

关键词:
这是NSGA-II算法.偏差指数的偏差指数有限时间热力学有限时间热力学没有不可逆转的MHD周期.多目标优化多目标优化性能比较 性能比较 性能比较

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A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump
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A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump

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相关实验视频

Last Updated: Jul 24, 2025

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科学领域:

  • 热力学是一种热力学.
  • 磁动力学是一种磁动力学.
  • 计算工程 计算工程 计算工程

背景情况:

  • 现有的不可逆磁动力学 (MHD) 循环模型为热力学分析提供了基础.
  • 有限时间热力学为优化在有限时间约束中的过程提供了一个框架.
  • 多目标优化对于在复杂系统中平衡竞争性性能指标至关重要.

研究的目的:

  • 执行一个不可逆转的磁动力循环的多目标优化.
  • 评估不同目标功能组合和决策方法的性能.
  • 将多目标优化结果与单目标优化结果进行比较.

主要方法:

  • 利用有限时间热力学理论和非主导排序遗传算法II (NSGA-II).
  • 引入了热交换器的热导电分布和工作流体的异热温度比作为优化变量.
  • 定义了输出功率,效率,生态功能和功率密度作为优化目标函数.

主要成果:

  • 使用LINMAP和TOPSIS决策方法进行多目标优化,与Shannon Entropy (0.1940,0.1950) 相比,产生较低的偏差指数 (0.1764在恒定的气体速度下,0.1767在恒定的马赫数下).
  • 这些多目标结果优于任何单一目标优化功率输出,效率,生态功能或功率密度的结果.
  • 多目标优化的偏差指数明显低于各个性能指标的单目标优化.

结论:

  • 与单一目标策略相比,多目标优化提供了一种更有效的方法来提高磁动力循环性能.
  • 有限时间热力学和NSGA-II的结合有效地平衡了多个性能标准.
  • 在复杂的热力学系统中,LINMAP和TOPSIS决策方法适用于选择最佳参数.