Related Concept Videos
Feedback control systems
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...
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...
Linear Approximation in Time Domain
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, the...
For a simple pendulum with a mass evenly distributed along its length and the center of mass located at half the pendulum's length, the...
Control System Problem
In an open-loop system, such as a basic thermostat, the poles of the transfer function influence the system's response but do not determine its stability. However, when feedback is introduced to form a closed-loop system, such as an advanced thermostat that adjusts heating based on room temperature, stability is governed by the new poles of the closed-loop transfer function.
When forming a closed-loop system, issues can arise if the poles cross into the unstable region, leading to potential...
When forming a closed-loop system, issues can arise if the poles cross into the unstable region, leading to potential...
Pole and System Stability
The transfer function is a fundamental concept representing the ratio of two polynomials. The numerator and denominator encapsulate the system's dynamics. The zeros and poles of this transfer function are critical in determining the system's behavior and stability.
Simple poles are unique roots of the denominator polynomial. Each simple pole corresponds to a distinct solution to the system's characteristic equation, typically resulting in exponential decay terms in the system's response.
Simple poles are unique roots of the denominator polynomial. Each simple pole corresponds to a distinct solution to the system's characteristic equation, typically resulting in exponential decay terms in the system's response.
Time-Domain Interpretation of PD Control
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...
Consider the example of control of motor torque. Initially, a positive...
PD Controller: Design
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,...
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
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Stabilization of nonlinear systems using sampled-data output-feedback fuzzy controller based on
1Department of Electronic Engineering, Division of Engineering, King’s College London, WC2R 2LS London, U.K. hakkeung.lam@kcl.ac.uk
Summary
This study introduces a novel sampled-data output-feedback (SDOF) fuzzy control approach for nonlinear systems. The sum-of-squares method ensures stability for polynomial fuzzy models, enhancing control system reliability.
Area of Science:
- Control Systems Engineering
- Fuzzy Logic Systems
- Nonlinear System Analysis
Background:
- Investigates the stability challenges in sampled-data output-feedback (SDOF) polynomial-fuzzy-model-based control systems.
- Highlights the increased complexity due to relying solely on system output for feedback and the impact of zero-order hold in sampled-data systems.
Purpose of the Study:
- To propose and analyze SDOF fuzzy controllers for nonlinear plants represented by polynomial fuzzy models.
- To develop stability conditions for systems with SDOF fuzzy controllers, considering variations in fuzzy rule configurations.
Main Methods:
- Employs polynomial fuzzy models to represent nonlinear systems.
- Utilizes Lyapunov stability theory combined with the sum-of-squares (SOS) approach for stability analysis.
- Considers two distinct cases for SDOF fuzzy controllers based on fuzzy rule sharing.
Main Results:
- Derives SOS-based stability conditions to ensure the stability of the closed-loop system.
- Successfully synthesizes SDOF fuzzy controllers that guarantee system stability.
- Simulation examples validate the effectiveness of the proposed control strategy.
Conclusions:
- The proposed SDOF fuzzy control approach, utilizing the SOS method, effectively addresses stability concerns in nonlinear sampled-data systems.
- The developed stability conditions provide a robust framework for designing reliable fuzzy controllers when only output feedback is available.

