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Related Concept Videos

Open and closed-loop control systems01:17

Open and closed-loop control systems

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Control systems are foundational elements in automation and engineering. They are broadly categorized into open-loop and closed-loop systems. These classifications hinge on the presence or absence of feedback mechanisms, significantly influencing the system's performance, complexity, and application.
An open-loop control system operates without feedback from the output. It consists of two primary elements: the controller and the controlled process. The controller receives an input signal...
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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.
Consider the example of control of motor torque. Initially, a positive...
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Time and frequency -Domain Interpretation of PI Control01:27

Time and frequency -Domain Interpretation of PI Control

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

Time and frequency -Domain Interpretation of Phase-lead Control

477
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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Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

422
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...
422
Feedback Loops01:01

Feedback Loops

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In most cases, excessive hormone production is prevented by negative feedback—a loop that starts with a stimulus inducing the release of a particular substance, like a hormone, to maintain a certain level before triggering a signal that results in a decrease in further release of the hormone.
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Related Experiment Video

Updated: Feb 6, 2026

Real-Time Proxy-Control of Re-Parameterized Peripheral Signals using a Close-Loop Interface
11:54

Real-Time Proxy-Control of Re-Parameterized Peripheral Signals using a Close-Loop Interface

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G Tolerance During Open- vs. Closed-Loop G-Time Control.

Mikael Grönkvist, Britta Levin, Ola Eiken

    Aerospace Medicine and Human Performance
    |August 22, 2018
    PubMed
    Summary

    Gz tolerance is similar in both closed-loop and open-loop systems for fighter pilots. Closed-loop control is not precise enough for accurate Gz tolerance determination.

    Area of Science:

    • Aerospace Medicine
    • Human Factors Engineering
    • Physiology

    Background:

    • +Gz tolerance is traditionally measured using open-loop G control, where subjects cannot influence G-load.
    • Modern centrifuges allow closed-loop G control, enabling subjects to influence G-load.
    • There is a prevailing belief among fighter pilots that +Gz tolerance is higher under closed-loop control.

    Purpose of the Study:

    • To investigate if +Gz tolerance is higher in closed-loop compared to open-loop G control.
    • To assess the feasibility of using closed-loop G control for precise +Gz tolerance determination.

    Main Methods:

    • Relaxed +Gz tolerance was measured in eight men during rapid Gz-onset rate (ROR) under open-loop with visual feedback (OL-VFB), open-loop with no visual feedback (OL-NFB), and closed-loop (CL) conditions.

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  • Straining +Gz tolerance was measured in ten men during ROR under open-loop (OL) and closed-loop (CL) conditions.

    • Main Results:

    • Relaxed +Gz tolerance showed no significant difference between CL (3.66 Gz), OL-VFB (3.70 Gz), and OL-NFB (3.64 Gz).
    • Straining +Gz tolerance was similar in CL (8.5 Gz) and OL (8.6 Gz) conditions.
    • Gz load variability was substantial in the CL condition, averaging lower than in OL conditions for a given G-time profile.

    Conclusions:

    • No systematic difference in relaxed or straining +Gz tolerance was found between closed-loop and open-loop G-controlled systems.
    • The precision and reproducibility of closed-loop control are insufficient for accurate determination of relaxed G tolerance.