A COMPARATIVE STUDY OF PARAMETRIC MODELS OF MAGNETORHEOLOGICAL FLUID SUSPENSION DAMPERS
Magnetorheological dampers more commonly called, MR dampers, are being developed for a wide variety of applications where controllable damping is desired. MR damper is an intelligent damper, which is used as automobile suspension for vibration control. MR fluids represent a class of smart materials whose rheological properties change in response to the application of a magnetic field. MR fluid dampers are new type of vibration control elements, having the advantages of rapid damping and stiffness changing in the presence of an applied magnetic field. MR dampers have received a great deal of attention in the last two decades due to their being a potential technology to conduct semi-active control. It is therefore vitally important to understand the dynamic behavior of such devices whose nonlinear hysteresis is a rather complicated phenomenon. Models can accurately represent the behaviour of MR dampers are essential in understanding the operation and working principles of the device. Such models can eliminate a great deal of uncertainties during the design process, which can subsequently enable control strategies for the damper to be developed efficiently and reliably. In this paper, MR fluid structure, damper description and parametric models have been presented.
MODELLING SIMULATION AND CONTROL OF AN ACTIVE SUSPENSION SYSTEM
Conventional passive suspension systems lag in providing the optimum level of performance. Passive suspensions are a trade-off between the conflicting demands of comfort and control. An active suspension system provides both comfort and control along with active roll and pitch control during cornering and braking. Thus it gives a ride that is level and bump free over an incredibly rough terrain. This paper is a review the active suspension system and the modelling, simulation and control of an active suspension system in MATLAB/Simulink. The performance of the system is determined by computer simulation in MATLAB/Simulink. The performance of the system can be controlled and improved by proper tuning a proportional-integral-derivative (PID) controller. The simulation study is performed to prove the effectiveness of this control approach and the performance of the system is compared with the conventional (passive) suspension system.
Modeling MR-dampers: a nonlinear blackbox approach
The focus of this paper is on the application of nonlinear blackbox identification techniques to the modeling of magnetorheological fluid dampers (MRD), a new family of devices devoted to solving a wide range of structural control problems. In the following, we first give in Section 1 a brief introduction to the current status and practice in civil engineering structural control. Then in Section 2, the guidelines for nonlinear blackbox modeling will be presented in a review manner. Following this the implementation of the identification algorithm, along with the detailed experimental results, will be given in Section 3. Finally in Section 4, we will discuss the generality of our approach by listing two interesting case studies.