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相关概念视频

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:
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Production Efficiency01:01

Production Efficiency

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Net production efficiency (NPE) is the efficiency at which organisms assimilate energy into biomass for the next trophic level. Due to low metabolic rates and less energy spent on thermoregulatory processes, the NPE of ectotherms (cold-blooded animals) is 10 times higher than endotherms (warm-blooded animals).
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Virtual Work for a System of Connected Rigid Bodies01:06

Virtual Work for a System of Connected Rigid Bodies

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Virtual work is a powerful method used to solve problems involving several connected rigid bodies. When the system is in equilibrium, virtual work is zero. This allows the calculation of the resulting forces when a system undergoes a virtual displacement. When attempting to analyze such a system, first, use a free-body diagram, where an independent coordinate represents the configuration of the links, and mark its deflected position resulting from the positive virtual displacement.
Next,...
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Energy Conservation and Bernoulli's Equation01:16

Energy Conservation and Bernoulli's Equation

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Applying the conservation of energy principle or the work-energy theorem to an incompressible, inviscid fluid in laminar, steady, irrotational flow leads to Bernoulli's equation. It states that the sum of the fluid pressure, potential, and kinetic energy per unit volume is constant along a streamline.
All the terms in the equation have the dimension of energy per unit volume. The kinetic energy per unit volume is called the kinetic energy density, and the potential energy per unit volume is...
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Virtual Work01:20

Virtual Work

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The principle of virtual work states that if a body is in static and dynamic equilibrium, then the sum of all the virtual work done by all external forces and couple moments for any given virtual displacement must be zero.
In static equilibrium, a body can experience an imaginary or virtual movement, such as displacement or rotation. The virtual work done by a force is equal to the dot product of force and virtual displacement in the direction of the force. When it comes to virtually rotating a...
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Mechanical Efficiency of Real Machines01:14

Mechanical Efficiency of Real Machines

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The mechanical efficiency of a machine is a fundamental concept that describes how effectively a machine can convert input work into output work. According to this concept, the efficiency of a machine is equal to the ratio of the output work to the input work. An ideal machine, meaning a machine that has no energy losses, has an efficiency of one. This implies that the input work and the output work are equal.
However, in reality, no machine can be truly ideal, and all of them experience some...
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相关实验视频

Updated: May 21, 2025

Knowledge Based Cloud FE Simulation of Sheet Metal Forming Processes
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节能云系统:虚拟机整合与强度优化

Xinming Han1, Jianxiao Wang2, Jiaxi Wu3

  • 1Department of Industrial Engineering and Management, College of Engineering, Peking University, Beijing 100871, China.

iScience
|March 19, 2025
PubMed
概括
此摘要是机器生成的。

这项研究优化了虚拟机 (VM) 在云计算中的放置,以更好地利用资源和提高能源效率. 一个新的强大的模型和启发式算法显著提高了性能,降低了能源消耗.

关键词:
计算机科学 计算机科学能源工程 能源工程是指能源工程.工程 工程师 工程师 工程师

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科学领域:

  • 云计算 云计算 云计算 云计算
  • 运营研究 运营研究
  • 能源效率 能源效率 能源效率

背景情况:

  • 云计算环境在优化虚拟机 (VM) 放置方面面临着挑战.
  • 不高效的VM放置导致资源未得到充分利用,能源消耗增加.
  • 虚拟机工作负载需求的不确定性使最佳资源配置变得复杂.

研究的目的:

  • 为虚拟机放置开发一个强大的优化模型.
  • 提高云数据中心的资源利用率和能源效率.
  • 解决虚拟机使用模式中的不确定性.

主要方法:

  • 混合整数线性编程 (MILP) 模型的制定.
  • 强度理论的整合,以处理工作负载的不确定性.
  • 开发用于大规模VM分配的启发式算法.

主要成果:

  • 拟议的MILP模型有效地优化了不确定性下的VM放置.
  • 在资源利用指标中观察到显著的改善.
  • 在实验数据中证明了能源效率的大幅提高.

结论:

  • 强大的优化方法为VM安置提供了有效的解决方案.
  • 启发式算法适用于实用,大规模的云环境.
  • 该研究证实了强大的优化对云资源管理的好处.