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相关概念视频

Fault Types01:18

Fault Types

447
When analyzing a single line-to-ground fault from phase A to ground at a three-phase bus, it is important to consider the fault impedance. This impedance is zero for a bolted fault, equal to the arc impedance for an arcing fault, and represents the total fault impedance for a transmission-line insulator flashover. To derive sequence and phase currents, fault conditions are translated from the phase domain to the sequence domain.
For line-to-line faults occurring between phases B and C, the...
447
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

1.0K
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
1.0K
Bearing Stress01:22

Bearing Stress

2.3K
Bearing stress refers to the contact pressure between two separate bodies. To visualize this, imagine a bolt thrust through a plate. The bolt applies a force to the plate, which exerts an equal but opposite force back onto the bolt. This force isn't just a singular entity but a compilation of numerous smaller forces distributed across the contact surface between the bolt and the plate.
Due to the intricacy of these microforces, an average value, known as bearing stress, is often used by...
2.3K
Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

802
Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...
802
Shear and Bending Moment Diagram: Problem Solving01:24

Shear and Bending Moment Diagram: Problem Solving

3.3K
When analyzing a beam supporting concentrated loads and a distributed load, drawing the shear and bending moment diagrams is essential. These diagrams help understand the internal forces and moments acting on the beam, which is crucial for designing safe and efficient structures. Follow these steps to create the shear and bending moment diagrams:
Draw a Free-Body Diagram: Start by drawing a free-body diagram of the entire beam, including the concentrated loads, distributed load, and reaction...
3.3K
Structural Classification of Joints01:20

Structural Classification of Joints

7.8K
Joints, also known as articulations, are classified based on their structural characteristics, i.e., based on whether the articulating surfaces of the adjacent bones are directly connected by fibrous connective tissue or cartilage, or whether the articulating surfaces contact each other within a fluid-filled joint cavity. These differences serve to divide the joints of the body into three structural classifications.
A fibrous joint is where the adjacent bones are united by fibrous connective...
7.8K

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相关实验视频

Updated: Feb 28, 2026

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator
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复合故障特征指数引导变化模式分解与动态加权中央集群用于轴承故障检测.

Bangcheng Zhang1, Boyu Shen1, Zhi Gao1

  • 1School of Mechatronic Engineering, Changchun University of Technology, Changchun 130103, China.

Sensors (Basel, Switzerland)
|February 27, 2026
PubMed
概括

本研究引入了一种使用复合故障特征指数 (CFFI) 和光谱能量保留率 (SERR) 的新型轴承故障检测方法. 这种方法提高了旋转机械的故障组件检测,以改善设备监控.

关键词:
轴承故障发生在轴承上集群算法集群算法集群算法集群算法集群算法集群算法缺陷的特征是错误的特征.模式分解 模式分解

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相关实验视频

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Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
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科学领域:

  • 机械工程 机械工程
  • 信号处理 信号处理
  • 状态监控 状态监控

背景情况:

  • 旋转机械容易发生轴承故障,导致周期性冲击和共振.
  • 现有的检测方法难以处理复杂的故障信号和噪声.

研究的目的:

  • 开发用于旋转机械轴承故障的先进检测方法.
  • 为了提高断层冲击强度和周期结构的量化.
  • 为了提高故障特征保留信号消噪后的准确性.

主要方法:

  • 构建了一个复合断裂特征指数 (CFFI),集成正常化曲解和模糊.
  • 定义了一种光谱能量保留率 (SERR) 用于评估无声化和特征保留.
  • 利用三角形拓聚合优化器 (TTAO) 进行自适应变量模式分解 (VMD) 参数选择.
  • 采用动态加权中心集群 (DWCC) 来选内在模式函数 (IMF) 与故障信封信息.

主要成果:

  • 拟议的方法在IMS轴承数据集上实现了较高的SERR (0.21356),与实际信号 (0.22465) 相比,相对误差为4.9%,表明重建精度更高.
  • 以CFFI为指导的优化有效地增强了冲动和周期性故障组件.
  • 在整个消毒过程中,保持了稳定的特征频段保留.

结论:

  • 开发的方法通过增强关键故障特征,准确检测轴承故障.
  • 这种方法证明了对现实设备监控的强大的工程适用性.
  • 这种技术为识别旋转机械中的轴承故障提供了可靠的解决方案.