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相关概念视频

Controller Configurations01:22

Controller Configurations

94
Controller configurations are crucial in a car's cruise control system because they manage speed over time to maintain a consistent pace regardless of road conditions, thereby meeting design goals. In traditional control systems, fixed-configuration design involves predetermined controller placement. System performance modifications are known as compensation.
Control-system compensation involves various configurations, most commonly series or cascade compensation, in which the controller...
94
Linear Approximation in Time Domain01:21

Linear Approximation in Time Domain

81
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,...
81
Feedback control systems01:26

Feedback control systems

307
Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
Linear feedback systems are theoretical models that simplify analysis and design. These systems operate under the principle that their output is directly proportional to their input within certain ranges. For instance, an amplifier in a control system behaves linearly as long as the input signal remains within a specific range. However, most physical systems exhibit inherent nonlinearity...
307
One-Degree-of-Freedom System01:24

One-Degree-of-Freedom System

487
In mechanical engineering, one-degree-of-freedom systems form the basis of a wide range of electrical and mechanical components. Using these models, engineers can predict the behavior of various parts in a larger system, which gives them insight into how different forces interact with each other.
A one-degree-of-freedom system is defined by an independent variable that determines its state and behavior. One example of a one-degree-of-freedom system is a simple harmonic oscillator, such as a...
487
Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

401
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...
401
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

460
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...
460

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相关实验视频

Updated: Jun 27, 2025

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

Published on: October 28, 2022

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为灵活的航天器设计基于固定时间观察者的自适应非单元滑动模式控制器.

Erfan Rezaei1, Hossein Bolandi1, Mohammad Fathi1

  • 1Electrical Engineering Department, Iran University of Science and Technology, Tehran, Iran.

ISA transactions
|April 27, 2024
PubMed
概括

本研究介绍了灵活航天器的固定时间控制策略,确保尽管振动和不确定性,准确的态度控制. 该方法保证在一定的时间内达到所需的姿势,增强稳定性和强度.

科学领域:

  • 航空航天工程 航空航天工程
  • 控制系统理论 控制系统理论
  • 机器人技术 机器人技术 机器人技术

背景情况:

  • 灵活的航天器由于振动和无法测量的模式变量而表现出复杂的动态.
  • 传统的控制方法与未知的干扰和固有的不确定性作斗争,影响着态度控制的准确性.
  • 固定时间控制在有限的,预先规定的时间内提供了保证的融合,这对于时间敏感的任务至关重要.

研究的目的:

  • 为灵活的航天器制定一个固定时间稳定策略.
  • 解决灵活模式振动,未知的干扰和系统不确定性所带来的挑战.
  • 为了在定义的时间框架内实现准确和强大的姿态控制.

主要方法:

  • 固定时间观测器的设计,用于估计不可测量的模态变量.
  • 开发使用估计变量的固定时间非单元滑动模式控制器.
  • 纳入适应性法律,以提高对外部干扰和不确定性的稳定性.
  • 使用利亚普诺夫理论进行稳定性分析,以保证趋同.

主要成果:

  • 设计的观察者保证了模态变量估计错误的固定时间趋同.
  • 控制器确保航天器在预先指定的时间内达到所需的态度,减少稳定状态错误.
关键词:
态度稳定 态度稳定固定时间控制控制器固定时间观察员观察员灵活的航天器 灵活的航天器非单一的滑动模式控制控制

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  • 适应性法增强了对未知的干扰和不确定性的稳定性.
  • 稳定性分析证实了观察者和态度错误在固定的值内趋同.
  • 结论:

    • 拟议的固定时间控制方法有效地实现了灵活航天器的准确和强大的姿态稳定.
    • 固定时间观察员和自适应控制器的集成显著提高了系统性能和弹性.
    • 模拟结果验证了开发的控制系统的实际适用性和有效性.