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COMPUTATIONAL METHODS FOR ENGINEERING SCIENCE
Edited by: B.H.V. Topping
Non-Linear and Hysteretic Analysis of the Behaviour of Magnetorheological Dampers
M.B. Cesar1 and R.C. Barros2
1Department of Applied Mechanics, Polytechnic Institute of Bragança (IPB-ESTiG), Portugal
M.B. Cesar, R.C. Barros, "Non-Linear and Hysteretic Analysis of the Behaviour of Magnetorheological Dampers", in B.H.V. Topping, (Editor), "Computational Methods for Engineering Science", Saxe-Coburg Publications, Stirlingshire, UK, Chapter 15, pp 363-398, 2012. doi:10.4203/csets.30.15
Keywords: magnetorheological damper, hysteretic behaviour, Bouc-Wen model.
The so-called "smart materials" have received the attention of researchers and engineers as a result of their ability to create smart devices that can be easily controlled by a small external perturbation like a magnetic field. Some of the most promising smart devices are based on fluids with controllable properties like electrorheological (ER) and magnetorheological (MR) fluids. MR dampers are semi-active devices whose damping characteristics can be modified in real time as a result of their ability to adjust the resistance to the flow of a MR fluid within the damper through the application of a magnetic field. The particular properties of the MR fluid allow variations in the damping force that can be controlled by varying an applied current. To predict the behaviour of MR dampers under certain magnetic fields or excitations, it is necessary to model the device with an appropriate approach. This becomes a relevant aspect because before the production of an MR damper, it is necessary to design and select the correct parameters that will define the behaviour of the device. This paper reviews the basic concept of MR fluids and provides an insight into the MR dampers non-linear behaviour through both experimental and numerical analyses. Several modelling techniques are available to represent the non-linear hysteretic behaviour of MR dampers. These models can characterize the performance of the MR device, but they are usually dependent on experimental data that must be available to determine the parameters involved in the model formulation. Thus, in the present study, a commercial MR damper was experimentally tested under several input excitations. Many parametric models are available in the literature with different levels of accuracy and complexity. After selecting some of the most common parametric numerical models, the related model parameters were obtained based on the measured responses and a comparison between the numerical and experimental results will be presented to validate the selected models.
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