Vibration Control Applied in a Semi-Active Suspension Using Magneto Rheological Damper and Optimal Linear Control Design

2013 ◽  
Vol 464 ◽  
pp. 229-234 ◽  
Author(s):  
Bruno Sousa Carneiro da Cunha ◽  
Fábio Roberto Chavarette
Keyword(s):  
Optimal Control ◽  
Nonlinear Systems ◽  
Control Design ◽  
Mr Damper ◽  
Active Suspension ◽  
Linear Control ◽  
Linear Feedback ◽  
Optimal Linear ◽  
Magneto Rheological ◽  
Non Linear System

In this paper we study the behavior of a semi-active suspension witch external vibrations. The mathematical model is proposed coupled to a magneto rheological (MR) damper. The goal of this work is stabilize of the external vibration that affect the comfort and durability an vehicle, to control these vibrations we propose the combination of two control strategies, the optimal linear control and the magneto rheological (MR) damper. The optimal linear control is a linear feedback control problem for nonlinear systems, under the optimal control theory viewpoint We also developed the optimal linear control design with the scope in to reducing the external vibrating of the nonlinear systems in a stable point. Here, we discuss the conditions that allow us to the linear optimal control for this kind of non-linear system.

Anti-Windup LPV Control of Magneto-Rheological Dampers

2009 ◽  
Author(s):  
Mona Meisami-Azad ◽  
Javad Mohammadpour ◽  
Karolos M. Grigoriadis
Keyword(s):  
Actuator Saturation ◽  
Design Method ◽  
External Disturbance ◽  
Control Design ◽  
Operating Parameter ◽  
Mr Damper ◽  
Saturation Parameter ◽  
The Status ◽  
And Performance ◽  
Magneto Rheological

In this paper, we develop a linear parameter varying (LPV) model for the structural systems including the Magneto-Rheological (MR) dampers where the LPV parameter is the MR damper velocity. We then propose an LPV anti-windup control design method to prevent the closed-loop system instability and performance degradation due to the MR damper actuator saturation. The proposed control design method accounts for the actuator nonlinearities by representing the status of the saturated actuator as an additional gain-scheduled varying parameter. The resulting controller is scheduled with respect to the system operating parameter and the actuator saturation parameter. Simulation results demonstrate that the anti-windup compensator scheduled based on the MR damper velocity and the saturation parameter is able to keep the voltage within the specified limits and meets the design requirement of rejecting the effect of the external disturbance signals.

On-Line Analysis of a Non-Linear Control System Using Correlation Methods

1968 ◽  
Vol 1 (6) ◽  
pp. 222-225 ◽  
Author(s):  
R. E. Selway ◽  
D. Bell
Keyword(s):  
Optimal Control ◽  
Control System ◽  
Linear Control ◽  
Correlation Methods ◽  
Non Linear ◽  
On Line ◽  
Hybrid Computer ◽  
Non Linear System ◽  
M Sequences ◽  
Working Point

In non-linear control processes the application of optimal control generally leads to a solution which is difficult to implement. The problem is approached here by the use of a correlation method of continual tracking of the working point on the static and dynamic characteristics of the control system. A hybrid computer is utilised to compute the correlation functions and continually to identify and reoptimise about the working point using quasi-linearisation techniques. The non-linear system considered is a hyrdaulic servomotor of a type used in aircraft flight control systems. The three-level m-sequences used as test signals are injected into the system during normal operation and, since they are uncorrelated with any other signal, may have an extremely small amplitude compared with the normal working input signal. Optimal control in this instance is applied by the use of a phase compensation network with a variable bandwidth. The change of bandwidth required to satisfy the performance criterion is calculated on-line and used to optimise the system. A brief summary of correlation methods is presented together with the equation's governing identification and optimisation. The hybrid computer arrangement is described and a selection of typical results is shown and discussed. A note on the stability of the overall system as a system with time delays is included. In conclusion, the problems of time-variant dynamics on non-linear systems are considered. A proposed hybrid computer scheme is presented for this purpose in which the characteristics of the m-sequences are up-dated to match the identified time constants of the system.

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