scholarly journals Design of an adaptive state feedback controller for a magnetic levitation system

2020 ◽  
Vol 10 (5) ◽  
pp. 4782
Author(s):  
Omar Waleed Abdulwahhab
Keyword(s):  
Equilibrium Point ◽  
State Feedback ◽  
Magnetic Levitation ◽  
The State ◽  
Feedback Controller ◽  
Pole Placement ◽  
Operating Point ◽  
State Feedback Controller ◽  
Levitation System ◽  
Magnetic Levitation System

This paper presents designing an adaptive state feedback controller (ASFC) for a magnetic levitation system (MLS), which is an unstable system and has high nonlinearity and represents a challenging control problem. First, a nonadaptive state feedback controller (SFC) is designed by linearization about a selected equilibrium point and designing a SFC by pole-placement method to achieve maximum overshoot of 1.5% and settling time of 1s (5% criterion). When the operating point changes, the designed controller can no longer achieve the design specifications, since it is designed based on a linearization about a different operating point. This gives rise to utilizing the adaptive control scheme to parameterize the state feedback controller in terms of the operating point. The results of the simulation show that the operating point has significant effect on the performance of nonadaptive SFC, and this performance may degrade as the operating point deviates from the equilibrium point, while the ASFC achieves the required design specification for any operating point and outperforms the state feedback controller from this point of view.

scholarly journals LQR state feedback controller with precompensator for magnetic levitation system

2021 ◽  
Vol 2111 (1) ◽  
pp. 012004
Author(s):  
A Winursito ◽  
G N P Pratama
Keyword(s):  
Steady State ◽  
High Speed ◽  
State Feedback ◽  
Magnetic Levitation ◽  
Feedback Controller ◽  
Steel Ball ◽  
State Feedback Controller ◽  
Wide Range ◽  
Levitation System ◽  
Magnetic Levitation System

Abstract Magnetic levitation system (MLS) is a nonlinear system that attracts the attention of many researchers, especially control engineers. It has wide range of application such as robotics, high-speed transportation, and many more. Unfortunately, it is not a simple task to control it. Here, we utilize state feedback controller with Linear-Quadratic Regulator (LQR) to regulate the position of a steel-ball in MLS. In addition, we also introduce the precompensator to nullify the steady-state errors. The linearized model, controller, and precompensator are simulated using Matlab. The results and simulation verify that the state feedback controller and precompensator succeed to stabilize the position of steel-ball at the equilibrium for 0.1766 seconds and no steady-state errors.

State-PID Feedback for Magnetic Levitation System

2012 ◽  
Vol 622-623 ◽  
pp. 1467-1473 ◽  
Author(s):  
Witchupong Wiboonjaroen ◽  
Sarawut Sujitjorn
Keyword(s):  
Linear Model ◽  
Feedback Linearization ◽  
State Feedback ◽  
Magnetic Levitation ◽  
The State ◽  
Stabilization Control ◽  
Control Scheme ◽  
Levitation System ◽  
Magnetic Levitation System ◽  
Integral Element

In this paper we consider stabilization control of a magnetic levitation system by state-PID feedback. First, a linear model that represents the nonlinear dynamics of the magnetic levitation system is derived by the feedback linearization technique. Then, the state-PID feedback control developed from the linear model is proposed. Results are compared between the conventional state feedback technique and the proposed method. The proposed control scheme introducing an integral element to work with the gain can effectively eliminate the state errors. Simulation results show the effectiveness of the proposed method for disturbance dampening and stabilizing the system.

scholarly journals Sensitivity-enhancing feedback control–based damage detection in delaminated smart composite plates

2019 ◽  
Vol 15 (7) ◽  
pp. 155014771986222
Author(s):  
Yan Guo ◽  
Yanan Jiang ◽  
Zhenghua Qian ◽  
Bin Huang
Keyword(s):  
Feedback Control ◽  
Damage Detection ◽  
Composite Structures ◽  
Present Method ◽  
State Feedback ◽  
Feedback Controller ◽  
Pole Placement ◽  
Smart Composite ◽  
Frequency Shifts ◽  
State Feedback Controller

In this article, we present a sensitivity-enhancing feedback control–based damage detection method for piezoelectric actuator and sensor bonded composite laminates with delamination failures. The present method mainly consists of two parts: delamination modeling and feedback controller design. We first introduce the adopted improved layerwise theory–based mathematical model for delamination modeling with finite element implementation. The obtained second-order governing equations are transformed into the state space model for design of state feedback controller. Proper pole placement is required to enhance the sensitivity of frequency shifts to stiffness change caused by delamination. We investigated different delamination interfaces and longitudinal locations for studying the feasibility and efficiency of the present method. The present results clearly demonstrate that with the applied state feedback controller, the frequency shifts of the closed-loop system are significantly enhanced. The proposed sensitivity-enhancing feedback control can be used as an efficient tool for detecting delamination failures in smart composite structures.

scholarly journals Adaptive State Feedback Control of Electromagnetic Levitation System for Uncertain Ball Mass

2011 ◽  
Vol 2-3 ◽  
pp. 1105-1110
Author(s):  
Gyu Man Park ◽  
Won Jae Hwang ◽  
Ho Lim Choi
Keyword(s):  
Output Feedback ◽  
Parameter Uncertainty ◽  
Feedback Linearization ◽  
State Feedback ◽  
Electromagnetic Levitation ◽  
Feedback Controller ◽  
State Feedback Control ◽  
State Feedback Controller ◽  
Levitation System ◽  
Ball Mass

For the last several decades, many results have been presented for controlling nonlinear systems that have parameter uncertainty. In this paper, we propose an adaptive state feedback controller based on input-output feedback linearization for electromagnetic levitation system(EMS) with unknown ball mass. We analytically show the regulation of the controlled electromagnetic levitation system by the proposed adaptive state feedback controller. We show the experiment results of electromagnetic levitation system and where there is uncertain ball mass.

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