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Related Concept Videos

Controller Configurations01:22

Controller Configurations

209
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...
209
Feedback control systems01:26

Feedback control systems

537
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...
537
Time and frequency -Domain Interpretation of PI Control01:27

Time and frequency -Domain Interpretation of PI Control

252
Proportional-Integral (PI) controllers are essential in many control systems to improve stability and performance. They are commonly used in everyday devices like thermostats to enhance system damping and reduce steady-state error. When the zero in the controller's transfer function is optimally placed, the system benefits significantly in terms of stability and accuracy.
Acting as a low-pass filter, the PI controller slows the system's response and extends settling times. This requires...
252
PD Controller: Design01:26

PD Controller: Design

431
In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
431
Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

217
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...
217
Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

185
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...
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Related Experiment Video

Updated: Nov 6, 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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Finite-time controller design with adaptive fixed-time anti-saturation compensator for hypersonic vehicle.

Yibo Ding1, Xiaokui Yue1, Chuang Liu1

  • 1School of Astronautics, Northwestern Polytechnical University, Xi'an 710072, China.

ISA Transactions
|May 9, 2021
PubMed
Summary

This study introduces an adaptive anti-saturation robust finite-time control algorithm (AARFTC) for flexible air-breathing hypersonic vehicles (FAHV). The novel algorithm enhances actuator performance and improves control accuracy under saturation conditions.

Keywords:
Adaptive fixed-time anti-saturation compensatorFast response speedFinite-time stabilityHigh convergent precisionHypersonic vehicleShorten saturation time

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Area of Science:

  • Aerospace Engineering
  • Control Systems Theory
  • Nonlinear Control

Background:

  • Flexible air-breathing hypersonic vehicles (FAHV) face challenges with actuator saturation, impacting control performance.
  • Existing anti-saturation methods may not sufficiently address rapid convergence and accuracy.
  • Robust control is crucial for FAHV operating under uncertain and disturbed conditions.

Purpose of the Study:

  • To design an adaptive anti-saturation robust finite-time control algorithm (AARFTC) for FAHV.
  • To improve the system's ability to exit saturated states quickly and accurately.
  • To enhance the overall tracking accuracy and robustness of the control system.

Main Methods:

  • Development of an adaptive fixed-time anti-saturation compensator (AFAC) with a novel adaptive law.
  • Integration of dynamic inversion control with AFAC for the velocity subsystem.
  • Application of differentiator-based backstepping control with AFAC for the height subsystem, utilizing recursive fixed settling time differentiators.

Main Results:

  • The AFAC demonstrates faster and more accurate convergence from saturated regions compared to traditional methods.
  • The adaptive law in AFAC effectively reduces saturation duration and speeds up tracking error convergence.
  • The AARFTC algorithm shows superior performance in simulations involving disturbances, uncertainties, and actuator saturations.

Conclusions:

  • The proposed AFAC and AARFTC algorithms significantly improve the anti-saturation capabilities and control performance of FAHV.
  • The methods provide robust and accurate control, even under challenging operating conditions.
  • The study highlights the effectiveness of adaptive and fixed-time control strategies for hypersonic vehicle applications.