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相关概念视频

Wind Turbine Machine Models01:24

Wind Turbine Machine Models

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In the growing field of wind energy, incorporating wind turbine models into transient stability analysis is essential. Induction and synchronous machines are the primary models used, with induction machines being prevalent due to their simplicity and reliability.
Induction machines interact through the rotating magnetic field generated by the stator and the rotor. The key parameter is slip, which is the difference between synchronous speed and rotor speed relative to synchronous speed. Slip is...
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Design Example: Calculating Safe Diameter for Wind-Exposed Disc01:17

Design Example: Calculating Safe Diameter for Wind-Exposed Disc

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Assessing safety in wind-exposed installations is crucial to preventing potential failures. This example explores the calculation and design adjustments needed to mount a circular disc on a building facade, where wind forces are a primary concern. A 4-meter diameter disc was initially designed as an aesthetic feature facing winds at a velocity of 25 meters per second, with an air density of 1.25 kilograms per cubic meter. Given these conditions, the drag force on the disc was determined using...
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Turbine-Governor Control01:17

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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...
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Suppose one wants to test independence between the two variables of a contingency table. The values in the table constitute the observed frequencies of the dataset. But how does one determine the expected frequency of the dataset? One of the important assumptions is that the two variables are independent, which means the variables do not influence each other. For independent variables, the statistical probability of any event involving both variables is calculated by multiplying the individual...
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Lumber defects, which can affect both the appearance and structural integrity of wood, include a variety of growth and manufacturing flaws. Growth defects such as knots and knotholes occur where branches were once attached to the tree trunk, with knotholes forming when these knots fall out. Other natural defects include decay and insect damage, which compromise the wood's strength and durability.
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Moment-of-Momentum Equation01:09

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The moment-of-momentum equation is a critical tool for analyzing the torque produced by the rotating blades of a wind turbine. This equation is derived by applying Newton's second law to a fluid particle, which states that the rate of change of linear momentum is equal to the external force acting on the particle.
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相关实验视频

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Data Acquisition Protocol for Determining Embedded Sensitivity Functions
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在复合式风力轮机叶片中使用相对自然频率变化和贝叶斯概率进行损害识别.

Panida Kaewniam1,2, Qingyang Wei3, Haoan Gu1

  • 1College of Mechanics and Engineering Science, Hohai University, Nanjing 211100, China.

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|December 11, 2025
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概括

本研究介绍了B-RNFC方法,用于风力轮机叶片的结构健康监测. 它通过将相对自然频率变化与贝叶斯概率相结合,准确地定位损伤.

关键词:
贝叶斯概率是贝叶斯的概率.复合材料是一种复合材料.检测损坏检测损坏的检测.模式分析 模式分析相对自然频率变化的相对变化.风力轮机的叶片可以

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相关实验视频

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科学领域:

  • 工程 工程师 工程师 工程师
  • 材料科学 材料科学 材料科学
  • 机械工程 机械工程

背景情况:

  • 结构健康监测 (SHM) 对风力轮机叶片 (WTB) 的可靠性和效率至关重要.
  • 传统的基于频率的方法与复合WTB复杂性和损害局部化作斗争.
  • 自然频率是对环境变化敏感的全球指标,限制了局部损害检测.

研究的目的:

  • 为复合WTBs开发一种先进的SHM方法.
  • 克服传统基于频率的损坏检测的局限性.
  • 使用一种新的方法,准确地定位复合WTB中的损伤.

主要方法:

  • 介绍了贝叶斯的相对自然频率变化 (B-RNFC) 方法.
  • 分析了与复合梁和WTBs损坏相关的自然频率变化.
  • 开发了规范化的RNFC曲线,并将它们与贝叶斯概率集成为损害映射.
  • 评估了B-RNFC性能,用于单次和多次损伤定位.

主要成果:

  • B-RNFC 方法证明了有效的损害定位.
  • 悬臂梁的有效定位范围:20-80%从固定端.
  • 复合WTB的有效定位范围:从根开始的叶片长度的40-80%.
  • 成功地定位了双重损伤,包括对称和中跨度场景.

结论:

  • B-RNFC 方法为复合式 WTB 中的 SHM 提供了一个强大的解决方案.
  • 与传统方法相比,这种方法提高了损害定位的准确性.
  • B-RNFC方法有助于提高WTB的可靠性和降低维护成本.