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Related Concept Videos

Feedback control systems01:26

Feedback control systems

793
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...
793
Transient and Steady-state Response01:24

Transient and Steady-state Response

655
In control systems, test signals are essential for evaluating performance under various conditions. The ramp function is effective for systems undergoing gradual changes, while the step function is suitable for assessing systems facing sudden disturbances. For systems subjected to shock inputs, the impulse function is the most appropriate test signal.
These test signals are integral in designing control systems to exhibit two key performance aspects: transient response and steady-state...
655
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

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Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
443
Time and frequency -Domain Interpretation of PI Control01:27

Time and frequency -Domain Interpretation of PI Control

474
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...
474
Reclosers and Fuses01:26

Reclosers and Fuses

616
Automatic circuit reclosers enhance the protection of distribution circuits by interrupting and auto-reclosing an AC circuit according to a preset sequence. They effectively manage temporary faults on overhead distribution lines, often caused by tree limbs or wildlife, by briefly disrupting service to improve overall reliability. However, contact with reclosers or energized broken conductors on the ground can pose serious hazards.
A comprehensive protection scheme for radial distribution...
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Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

438
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...
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Related Experiment Video

Updated: Mar 27, 2026

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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Event-Triggered Fault Detection Filter Design for a Continuous-Time Networked Control System.

Yu-Long Wang, Peng Shi, Cheng-Chew Lim

    IEEE Transactions on Cybernetics
    |January 8, 2016
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces an event-triggered fault detection filter (FDF) and controller for networked control systems (NCS) with sensor faults. The new mechanism improves network efficiency and fault detection performance.

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    Area of Science:

    • Control Engineering
    • Networked Control Systems (NCS)
    • Fault Detection and Diagnosis

    Background:

    • Continuous-time networked control systems (NCS) are susceptible to sensor faults.
    • Existing fault detection methods often do not account for network-induced delays and packet dropouts effectively.
    • Efficient network bandwidth utilization is crucial in NCS applications.

    Purpose of the Study:

    • To develop a coordinated design for event-triggered fault detection filters (FDF) and controllers in NCS with biased sensor faults.
    • To propose a novel event-triggering mechanism considering network bandwidth and fault probability.
    • To analyze the H∞ performance and ensure robustness against disturbances.

    Main Methods:

    • Establishment of a new closed-loop model for NCS incorporating network-induced delays and packet dropouts.
    • Development of a simultaneous network bandwidth utilization ratio and fault occurrence probability-based event-triggering mechanism.
    • Application of a combined mutually exclusive distribution and Wirtinger-based integral inequality approach for integral inequality handling.

    Main Results:

    • A less conservative approach to integral inequalities for products of vectors is presented.
    • The designed FDF and controller ensure sensitivity to faults while maintaining NCS robustness to external disturbances.
    • The proposed event-triggering mechanism and coordinated design are validated through simulation.

    Conclusions:

    • The proposed event-triggered FDF and controller coordinated design effectively addresses biased sensor faults in NCS.
    • The novel event-triggering mechanism enhances network resource utilization and fault detection capabilities.
    • The developed methodology offers improved performance compared to existing approaches.