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相关概念视频

Sequence Networks of Rotating Machines01:24

Sequence Networks of Rotating Machines

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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...
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Optimization problems often involve identifying maximum or minimum values under specific constraints. A well-known example is determining the longest horizontal pipe that can be moved around a right-angled corner, where a 3-meter-wide hallway meets a 2-meter-wide hallway. This scenario, common in architectural design and industrial transport, can be understood conceptually through geometric and trigonometric reasoning.To visualize the problem, consider the pipe as a straight line that touches...
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Consider a truss structure with frictionless joints fixed to a wall and roller support. If a force of 150 N is applied to joint A, the forces in each member of the truss can be determined using the method of joints.
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In the design of a supported timber beam subjected to a distributed load, both the beam's physical dimensions and the timber's characteristics, such as its grade and species, are critical. These factors determine the allowable stress values, which are crucial for calculating the necessary beam depth to ensure structural integrity and safety.
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Three-Dimensional Force System:Problem Solving01:30

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A three-dimensional force system refers to a scenario in which three forces act simultaneously in three different directions. This type of problem is commonly encountered in physics and engineering, where it is necessary to calculate the resultant force on the system, which can then be used to predict or analyze the behavior of the object or structure under consideration.
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Laminar flow occurs when a fluid moves smoothly in parallel layers with minimal mixing and turbulence. In fluid mechanics, ensuring laminar flow within a pipe is essential for precise control of flow characteristics, especially in engineering applications. The key factor in determining whether flow remains laminar is the Reynolds number, a dimensionless quantity that depends on the fluid's velocity, density, viscosity, and the pipe's diameter. A Reynolds number of 2100 or lower...
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相关实验视频

Updated: Mar 7, 2026

Automatic Laser-based Geometry Capture for Finite Element Analysis of Weld Beads
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Published on: July 25, 2025

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改进了基于接序优化研究的多目标粒子群集优化.

Lei Dong1,2,3, Shimin Gu4, Jianwei Dong4

  • 1Shenyang Institute of Computing Technology Chinese Academy of Sciences, Shenyang, China.

PloS one
|March 5, 2026
PubMed
概括
此摘要是机器生成的。

优化船舶的接顺序可以减少变形和应力. 一个改进的算法 (IMaOPSO) 增强了传统方法,从而提高了船舶建造的接质量和效率.

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科学领域:

  • 海军建筑和海洋工程
  • 计算工程 计算工程 计算工程
  • 材料科学与工程 材料科学与工程

背景情况:

  • 船舶部件的传统接顺序优化 (WSO) 方法往往不足,依赖于经验,导致变形和裂等问题.
  • 在WSO中,复杂,多目标和非线性挑战需要先进的系统方法.
  • 现有的优化算法可能会与造船WSO的高维度和特定约束作斗争.

研究的目的:

  • 开发船舶结构部件的系统接顺序优化 (WSO) 方法.
  • 将流程和几何约束集成到正式的优化框架中.
  • 量化结构变形和残余应力作为关键优化目标.

主要方法:

  • 开发一个改进的多目标粒子集群优化 (IMaOPSO) 算法.
  • 增强经典的粒子群集优化 (PSO) 具有适应性模糊主导和精英引导的扰动,以改善融合和多样性.
  • 使用SYSWELD软件进行模拟分析,以评估不同的接序列.

主要成果:

  • 与已建立的算法 (NSGA-II,SPEA2,SMPSO) 相比,IMaOPSO算法显示出更高的收速度和稳定性.
  • 一个船甲板结构的案例研究显示,使用优化序列,平均变形显著减少 (32.6%至62.2%).
  • 提出的方法有效地解决了具有集成约束的高维的WSO问题.

结论:

  • 开发的系统性WSO方法,由IMaOPSO提供动力,为复杂的造船挑战提供了强大的解决方案.
  • 优化的接顺序通过减少变形和残余应力,显著提高了接质量.
  • 这种方法对于提高造船效率和质量具有相当大的实际工程价值.