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相关概念视频

Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

496
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
496
Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

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Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....
414
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
Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

429
Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
Consider the example of control of motor torque. Initially, a positive...
429
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

433
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
433
Linear Approximation in Time Domain01:21

Linear Approximation in Time Domain

388
Nonlinear systems often require sophisticated approaches for accurate modeling and analysis, with state-space representation being particularly effective. This method is especially useful for systems where variables and parameters vary with time or operating conditions, such as in a simple pendulum or a translational mechanical system with nonlinear springs.
For a simple pendulum with a mass evenly distributed along its length and the center of mass located at half the pendulum's length,...
388

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相关实验视频

Updated: Mar 15, 2026

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator
06:45

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波形辅助自适应EKF相位移估计方法用于运动诱导的错误补偿.

Xin Lai1, Qiushuo Yu1, Zhenyi Chen2

  • 1School of Mechanical and Electrical Engineering, Southwest Petroleum University, Chengdu 610500, China.

Sensors (Basel, Switzerland)
|March 14, 2026
PubMed
概括

这项研究引入了一种波纹辅助的自适应扩展卡尔曼波器 (WAEKF),以解决相位变换特征测量 (PSP) 中的运动错误. 新方法准确地估计了相位变化,大大减少了动态场景中的3D重建错误.

关键词:
扩展的卡尔曼过器动议引起的补偿阶段估计阶段估计.国家空间模型.波形变换波形变换波形变换.

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科学领域:

  • 光学和光子学 在光学和光子学.
  • 计算机视觉 计算机视觉
  • 计量学 计量学 计量学

背景情况:

  • 阶段转移造型测量 (PSP) 对动态环境中运动诱导的阶段变化敏感.
  • 这些变化会导致显著的错误,如波纹,扭曲和3D重建的精度降低.
  • 现有的PSP方法通常假定固定相位移,这对于动态场景来说是有问题的.

研究的目的:

  • 开发一种可靠的方法来估计动态场景中的像素相位移.
  • 为了减轻移动诱导的相位误差在相位变换的 profilometry.
  • 为了提高从边缘图案的3D重建的准确性和可靠性.

主要方法:

  • 建议使用波波式辅助自适应扩展卡尔曼波器 (WAEKF) 来估计不同的像素相位移.
  • 基于波纹的策略被用来从EKF的边缘模式中提取初始的空间载波频率.
  • 使用前向后向波器建立了一个状态空间模型,其中包含二次相组件和载波频率.

主要成果:

  • 拟议的WAEKF方法成功获得了准确的初始载波频率和相位转移图.
  • 实验结果表明,3D重建错误的显著减少.
  • 该方法有效地弥补动态场景中运动诱导的相位错误.

结论:

  • 波纹辅助的自适应扩展卡尔曼波器为PSP中的运动工件提供了有效的解决方案.
  • 该方法提高了动态环境中3D重建的准确性.
  • 这种方法具有适应性,可以扩展到N级PSP系统.