Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

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

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Data-driven phenotypes across the full AKI severity spectrum in patients admitted to the ICU.

Nefrologia·2026
Same author

Probiotic supplementation and postoperative antioxidant response in patients undergoing open‑heart surgery: a randomized controlled trial.

Cardiovascular endocrinology & metabolism·2026
Same author

Understanding critical thinking practices in Iranian healthcare managers: Qualitative insights.

Health promotion perspectives·2025
Same author

Applying Critical Thinking Frameworks in Public Health: A Systematic Review of Strategic Approaches to Enhance Decision-Making and Policy Development.

Health science reports·2025
Same author

Optical XOR logic gate design in two dimensional photonic crystal using ANN and PSO.

Scientific reports·2025
Same author

Motion of fullerene nanomachines on thermally activated curved gold substrates.

Scientific reports·2025

Related Experiment Video

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
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

1.6K

Designing a fixed-time observer-based adaptive non-singular sliding mode controller for flexible spacecraft.

Erfan Rezaei1, Hossein Bolandi1, Mohammad Fathi1

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

ISA Transactions
|April 27, 2024
PubMed
Summary

This study presents a fixed-time control strategy for flexible spacecraft, ensuring accurate attitude control despite vibrations and uncertainties. The method guarantees reaching the desired attitude within a set time, enhancing stability and robustness.

Keywords:
Attitude StabilizationFixed-Time ControlFixed-Time ObserverFlexible SpacecraftNon-Singular Sliding Mode Control

More Related Videos

Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques
09:01

Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques

Published on: April 4, 2017

8.7K
An Experimental Platform to Study the Closed-loop Performance of Brain-machine Interfaces
10:51

An Experimental Platform to Study the Closed-loop Performance of Brain-machine Interfaces

Published on: March 10, 2011

13.7K

Related Experiment Videos

Last 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
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

1.6K
Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques
09:01

Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques

Published on: April 4, 2017

8.7K
An Experimental Platform to Study the Closed-loop Performance of Brain-machine Interfaces
10:51

An Experimental Platform to Study the Closed-loop Performance of Brain-machine Interfaces

Published on: March 10, 2011

13.7K

Area of Science:

  • Aerospace Engineering
  • Control Systems Theory
  • Robotics

Background:

  • Flexible spacecraft exhibit complex dynamics due to vibrations and unmeasurable modal variables.
  • Traditional control methods struggle with unknown disturbances and inherent uncertainties, impacting attitude control accuracy.
  • Fixed-time control offers guaranteed convergence within a finite, pre-specified time, crucial for time-sensitive missions.

Purpose of the Study:

  • To develop a fixed-time stabilization strategy for flexible spacecraft.
  • To address challenges posed by flexible mode vibrations, unknown disturbances, and system uncertainties.
  • To achieve accurate and robust attitude control within a defined time frame.

Main Methods:

  • Design of a fixed-time observer for estimating unmeasurable modal variables.
  • Development of a fixed-time non-singular sliding mode controller utilizing estimated variables.
  • Incorporation of an adaptive law for enhanced robustness against external disturbances and uncertainties.
  • Stability analysis using Lyapunov theory to guarantee convergence.

Main Results:

  • The designed observer guarantees fixed-time convergence of modal variable estimation errors.
  • The controller ensures the spacecraft reaches its desired attitude within a pre-specified time, reducing steady-state error.
  • The adaptive law enhances robustness against unknown disturbances and uncertainties.
  • Stability analysis confirms convergence of observer and attitude errors within a fixed threshold.

Conclusions:

  • The proposed fixed-time control approach effectively achieves accurate and robust attitude stabilization for flexible spacecraft.
  • The integration of a fixed-time observer and adaptive controller significantly improves system performance and resilience.
  • Simulation results validate the practical applicability and effectiveness of the developed control system.