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Related Concept Videos

Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

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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.
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Cruise control systems in cars are designed as multi-input systems to maintain a driver's desired speed while compensating for external disturbances such as changes in terrain. The block diagram for a cruise control system typically includes two main inputs: the desired speed set by the driver and any external disturbances, such as the incline of the road. By adjusting the engine throttle, the system maintains the vehicle's speed as close to the desired value as possible.
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PID Controller01:19

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Proportional-Integral-Derivative (PID) controllers are widely used in various control systems to enhance stability and performance. In a thermostat, it adjusts heating or cooling based on the temperature difference between the actual and desired levels. They are often used in automotive speed systems, effectively managing sudden speed changes while maintaining a constant speed under varying conditions. On the other hand, PI controllers, commonly employed in voltage regulation, enhance stability...
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Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass...
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Overcurrent relays, crucial for circuit protection, are connected to the secondary current of a current transformer. There are two primary types of overcurrent relays: instantaneous and time-delay.
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Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV ratings. Four types of communication channels are used for pilot relaying:
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Related Experiment Video

Updated: Jan 10, 2026

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Prescribed-time containment control with self-triggering mechanism for multi-UAVs.

An Zhang1, Tianle Hou2, Wenhao Bi1

  • 1School of Aeronautics, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi, China; National Key Laboratory of Aircraft Configuration Design, Xi'an, 710072, Shaanxi, China.

ISA Transactions
|November 20, 2025
PubMed
Summary

This study introduces a novel self-triggering containment control for multiple unmanned aerial vehicles (UAVs) to converge within leader-defined boundaries in a specified time. The method significantly reduces communication and controller updates, enhancing efficiency.

Keywords:
Asynchronous communicationContainment controlPrescribed-time stability theorySelf-triggering mechanismUnmanned aerial vehicle

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Area of Science:

  • Robotics
  • Control Systems Engineering
  • Distributed Systems

Background:

  • Cooperative control of multiple unmanned aerial vehicles (UAVs) enhances task execution and operational safety.
  • Existing methods often require continuous communication and controller updates, limiting efficiency.
  • Achieving containment control within a specified time presents a significant challenge.

Purpose of the Study:

  • To develop a prescribed-time self-triggering containment control strategy for multiple UAVs.
  • To enable followers to converge within a convex hull defined by leaders within an arbitrary specified time.
  • To reduce communication and controller update frequencies while ensuring system stability.

Main Methods:

  • A distributed prescribed-time observer estimates leader states and the convex hull.
  • Auxiliary states are introduced to design a prescribed-time containment controller.
  • A self-triggering mechanism is developed to enable asynchronous communication and reduce update rates.

Main Results:

  • The proposed method guarantees convergence to the convex hull within the prescribed time without Zeno behavior.
  • Communication frequency was reduced by 94.86% and controller updates by 92.65% in simulations.
  • Hardware experiments validated the practical applicability of the control algorithm.

Conclusions:

  • The developed self-triggering containment control effectively achieves prescribed-time convergence for multiple UAVs.
  • The asynchronous communication and reduced update frequencies offer significant practical advantages.
  • The method provides a robust and efficient solution for cooperative UAV missions.