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相关概念视频

Machines01:19

Machines

579
Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. One example of a machine is the cutting plier, which is used to cut wires by applying forces to its handles. When equal and opposite forces are exerted on the handles of the cutting plier, they cause the cutting edges to come together and apply equal and opposite reaction forces on the wire, which are greater than the applied forces.
A free-body diagram of the...
579
Machines: Problem Solving II01:30

Machines: Problem Solving II

668
Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. Consider a lifting tong carrying a 100 kg load. It comprises movable sections DAF and CBG linked together with member AB.
668
Machines: Problem Solving I01:22

Machines: Problem Solving I

714
A toggle clamp is a mechanical device commonly used for holding and clamping objects in various applications, such as woodworking, metalworking, and assembly operations. Consider a toggle clamp subjected to a force of 200 N at the handle. The vertical clamping force can be calculated, provided the dimensions of the toggle clamp are known.
The toggle clamp system is a machine structure consisting of movable, pin-connected multi-force members that form a stabilized system to transmit forces. The...
714
Mechanical Efficiency of Real Machines01:14

Mechanical Efficiency of Real Machines

1.3K
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...
1.3K
Sequence Networks of Rotating Machines01:24

Sequence Networks of Rotating Machines

489
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...
489
Simplified Synchronous Machine Model01:30

Simplified Synchronous Machine Model

780
The Synchronous Machine Model is a fundamental tool in analyzing and ensuring the transient stability of power systems. This model simplifies the representation of a synchronous machine under balanced three-phase positive-sequence conditions, assuming constant excitation and ignoring losses and saturation. The model is pivotal for understanding the behavior of synchronous generators connected to a power grid, particularly during transient events.
In this model, each generator is connected to a...
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基于机器视觉和机器学习的结构损坏检测和安全评估方法.

Shengmin Wang1, Moxiao Li2,3, Di Le4

  • 1School of Management, Wuhan Textile University, Wuhan, China.

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此摘要是机器生成的。

本研究引入了一种新的基于视觉的框架,用于检测结构损坏. 它使用深度学习和机器学习准确评估基础设施安全,在损害分类和细分方面实现高性能.

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科学领域:

  • 土木工程 土木工程是指土木工程.
  • 计算机视觉 计算机视觉
  • 人工智能的人工智能

背景情况:

  • 基础设施的安全性和耐用性至关重要.
  • 精确的结构损坏检测对于维护至关重要.
  • 现有的方法可能缺乏解释性或准确性.

研究的目的:

  • 为结构安全评估开发一个新的基于多个尺度的视觉框架.
  • 整合深度学习和机器学习,以准确检测和分类损害.
  • 为自动化结构健康评估提供可解释和通用化的解决方案.

主要方法:

  • 集成ResNet-50和SegFormer模型用于损坏分类和细分.
  • 量化提取七个关键损伤参数 (例如,裂长度,裂面积).
  • 开发一个随机森林 (RF) 模型,将视觉特征映射到安全级别.

主要成果:

  • 基于射频的安全评估模型实现了87.0%的准确性,0.76的F1得分和0.83的AUC.
  • 与传统的机器学习方法相比,表现出更高的性能.
  • 强调了拟议框架的强大概括和分类能力.

结论:

  • 开发的框架为自动化结构损坏检测提供了一个全面的解决方案.
  • 该方法提供了准确和可解释的结构安全评估.
  • 这项工作有助于推进自动化基础设施健康监测.