scholarly journals New Robust Control Design of Brake-by-Wire Actuators

2020 ◽  
Author(s):  
Ehsan Arasteh ◽  
Francis Assadian
Keyword(s):  
Robust Control ◽  
Design Method ◽  
Control Design ◽  
Wheel Slip ◽  
Active Systems ◽  
Slip Control ◽  
Stopping Distance ◽  
Wheel Model ◽  
Robust Control Design ◽  
Pressure Modulation

This chapter discusses control design of three different brake-by-wire actuators. The brakes studied include an Electro-Hydraulic brake with pressure modulation for wheel slip control, and two different Electro-Mechanical Brake configurations that directly use electric motors to control the movement of the caliper for wheel slip control. After modeling the actuators with the use of bond graphs, a cascaded control architecture is used to control these active systems. Individual controllers are designed using Youla robust control design method. Then, a feed-forward disturbance rejection is designed and added to the loops and its effectiveness is analyzed. Finally, a one-wheel model is used to compare these brake-by-wire systems in terms of stopping distance and actuator efforts.

Robust Control Design of a Single Degree-of-Freedom Magnetic Levitation System by Quantitative Feedback Theory

2012 ◽  
Author(s):  
Feng Tian ◽  
Mark Nagurka
Keyword(s):  
Robust Control ◽  
Magnetic Levitation ◽  
Design Method ◽  
Control Design ◽  
Open Loop ◽  
Quantitative Feedback Theory ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Maglev System ◽  
Robust Control Design

A magnetic levitation (maglev) system is inherently nonlinear and open-loop unstable because of the nature of magnetic force. Most controllers for maglev systems are designed based on a nominal linearized model. System variations and uncertainties are not accommodated. The controllers are generally designed to satisfy gain and phase margin specifications, which may not guarantee a bound on the sensitivity. To address these issues, this paper proposes a robust control design method based on Quantitative Feedback Theory (QFT) applied to a single degree-of-freedom (DOF) maglev system. The controller is designed to successfully meet the stability requirement, robustness specifications, and bounds on the sensitivity. Experiments verify that the controller maintains stable levitation even with 100% load variation. Experiments prove that it guarantees the transient response design requirements even with 100% load change and 39% model uncertainties. The QFT control design method discussed in this paper can be applied to other open-loop unstable systems as well as systems with large uncertainties and variations to improve system robustness.

A New Robust Control Design for Linear Systems With Norm Bounded Time Varying Real Parameter Uncertainty

2010 ◽  
Author(s):  
Nagini Devarakonda ◽  
Rama K. Yedavalli
Keyword(s):  
Robust Control ◽  
Linear Systems ◽  
Parameter Uncertainty ◽  
Design Method ◽  
Control Design ◽  
Design Methods ◽  
Real Parameter ◽  
Time Varying ◽  
Robust Control Design ◽  
Real Parameter Uncertainty

In this paper, a new methodology for robust control design of linear systems with time varying real parameter uncertainty is presented. The distinctive feature of this method is that it specifically offers robustness guarantees to real parameter uncertainty thereby providing a much needed alternative design method compared to existing design methods such as H∞ and μ-synthesis methods which tend to be conservative when specialized to real parameter uncertainty. The proposed robust control design method is inspired by sign (qualitative) stability idea from ecology, leading to a specific structure in the desired closed loop system matrix involving pseudosymmetry. The design procedure is simple and straightforward without requiring intensive computation. The proposed design algorithm is illustrated with aerospace applications. This algorithm is quite promising with considerable scope for extensions and improvements, finally adding to the bank of available control design methods for linear state space systems.

Improvement of Hydractive Suspension Hard Mode Confort Thanks to a Low Frequency Active CRONE System: Part 2—Control Part and Simulation Results

2009 ◽  
Author(s):  
Xavier Moreau ◽  
Audrey Rizzo ◽  
Alain Oustaloup ◽  
Vincent Hernette
Keyword(s):  
Robust Control ◽  
Design Method ◽  
Low Frequency ◽  
Control Design ◽  
Control Law ◽  
Crone Control ◽  
System Part ◽  
Robust Control Design ◽  
And Performance ◽  
Optimal Approach

This paper presents a control law for a low frequency active suspension system necessary for the implementation of the strategy defined in the first paper. The structure of the proposed control law is based on cooperation between feedforward and feedback. Feedforward design is based on the vehicle physics. The feedback law is synthesized from CRONE control-design method, french acronym of “Commande Robuste d’Ordre Non Entier” (non integer order robust control). Modeling, robust control-design in frequency-domain, optimal approach, stability analysis and performance are presented in this paper.

Robust control design method for uncertain system using a set of measurements

2013 ◽  
Author(s):  
S. Khadraoui ◽  
H. Nounou ◽  
M. Nounou ◽  
A. Datta ◽  
S. P. Bhattacharyya
Keyword(s):  
Robust Control ◽  
Design Method ◽  
Control Design ◽  
Uncertain System ◽  
Robust Control Design
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