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相关概念视频

Feedback control systems01:26

Feedback control systems

273
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...
273
Linear time-invariant Systems01:23

Linear time-invariant Systems

208
A system is linear if it displays the characteristics of homogeneity and additivity, together termed the superposition property. This principle is fundamental in all linear systems. Linear time-invariant (LTI) systems include systems with linear elements and constant parameters.
The input-output behavior of an LTI system can be fully defined by its response to an impulsive excitation at its input. Once this impulse response is known, the system's reaction to any other input can be...
208
BIBO stability of continuous and discrete -time systems01:24

BIBO stability of continuous and discrete -time systems

327
System stability is a fundamental concept in signal processing, often assessed using convolution. For a system to be considered bounded-input bounded-output (BIBO) stable, any bounded input signal must produce a bounded output signal. A bounded input signal is one where the modulus does not exceed a certain constant at any point in time.
To determine the BIBO stability, the convolution integral is utilized when a bounded continuous-time input is applied to a Linear Time-Invariant (LTI) system....
327
Second Order systems II01:18

Second Order systems II

84
In an underdamped second-order system, where the damping ratio ζ is between 0 and 1, a unit-step input results in a transfer function that, when transformed using the inverse Laplace method, reveals the output response. The output exhibits a damped sinusoidal oscillation, and the difference between the input and output is termed the error signal. This error signal also demonstrates damped oscillatory behavior. Eventually, as the system reaches a steady state, the error diminishes to zero.
84
Linear Approximation in Time Domain01:21

Linear Approximation in Time Domain

59
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,...
59
Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

79
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...
79

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相关实验视频

Updated: May 27, 2025

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

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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在外国直接投资 (FDI) 攻击下的非线性系统,扩大了基于国家观察员的后退控制.

Ning Xu1, Huiling Xu1, Zhiping Lin2

  • 1School of Mathematics and Statistics, Nanjing University of Science and Technology, Nanjing, 210094, China.

ISA transactions
|February 19, 2025
PubMed
概括

本研究引入了针对面临虚假数据注入 (FDI) 攻击的非线性系统的新控制方法. 拟议的基于观察者的后退控制估计了状态和攻击,确保了系统稳定性和准确的跟踪.

关键词:
后退的控制控制 后退的控制扩大国家观察员.虚假数据注入攻击的攻击.非线性系统是非线性系统.

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相关实验视频

Last Updated: May 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 Analysis for Fall Detection System Simplification
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科学领域:

  • 控制系统工程 控制系统工程
  • 非线性系统分析 非线性系统分析
  • 控制网络安全的控制

背景情况:

  • 严格反的非线性系统容易受到未测量的状态动态的影响.
  • 假数据注入 (FDI) 攻击对系统安全和性能构成重大威胁.
  • 现有的控制策略可能无法充分解决同时进行状态估计和攻击缓解的问题.

研究的目的:

  • 为在外国直接投资攻击下对非线性系统开发强大的控制方案.
  • 同时估计未测量的状态,并检测/补偿外国直接投资的攻击.
  • 确保闭环系统的稳定性和性能,尽管存在安全威胁.

主要方法:

  • 新型扩展状态观察器 (ESO) 的设计,用于在线状态和攻击估计.
  • 开发一个与ESO集成的后退控制策略.
  • 实现一个带有攻击补偿机制的输出反跟踪控制器.

主要成果:

  • 拟议的方案保证了闭环系统的半全球均最终边界性.
  • 观察错误被证明是可调整到任意小的值.
  • 追踪错误汇聚到源地的一个小邻里,证明了有效的控制.

结论:

  • 基于国家观察员的新型扩展后退控制有效地解决非线性系统中的外国直接投资攻击.
  • 拟议的方法确保了系统稳定性和准确的状态跟踪,即使在未测量的状态.
  • 模拟示例证实了开发的控制策略的实际有效性和稳定性.