A new dynamic hysteresis model for magnetorheological dampers

Abstract

Semi-actively controlled magnetorheological (MR) fluid dampers offer rapid variation in damping properties in a reliable fail-safe manner using very low power requirements. Their characteristics make them ideal for semi-active control in structures and vehicle applications in order to efficiently suppress vibration. To take advantage of their exceptional characteristics, a high fidelity model is required for control design and analysis. Perfect understanding of the dynamic characteristics of such dampers is necessary when implementing MR struts in applications. Different models have been proposed to simulate the hysteresis phenomenon of MR dampers. The Bouc-Wen model has been extensively used to simulate the hysteresis behavior of MR dampers. However, considerable differences still exist between the simulation and experimental results. Moreover, the characteristic parameters in the traditional Bouc-Wen model are not functions of the frequency, amplitude and current excitations; therefore, the estimated parameters can characterize the behavior of the tested MR damper under specific excitation conditions and must be re-evaluated if a different combination of excitation parameters is desired. This can be extremely cumbersome and computationally expensive. In this work, a new hysteresis model based on the Bouc-Wen model has been developed to better characterize the hysteresis phenomenon of the MR damper. The proposed model incorporates the frequency, amplitude and current excitation as variables and thus enables us to predict efficiently and accurately the hysteresis force for changing excitation conditions. The proposed modified Bouc-Wen model has been validated against the experimental results through graphical and quantitative analysis in time, displacement and velocity domains and an excellent correlation has been found.

Modeling and characterization of a magneto-rheological fluid based damper and analysis of vibration isolation with the damper operating in passive mode

“…1. Such a type of damper is commercially available (for example, from Lord Corporation RD-1000 series), and used for mitigating seismic vibration of structures [21][22][23][24].…”

Variable compliance device for a respiratory physiotherapy training simulator

“…Unfortunately, there is no analytical method to determine α, β, γ, n and A. In the literature they are mostly estimated by trial and error techniques using experimental data obtained with a prototype [14]. The parameters β, γ, n and A determine the shape of the hysteresis.…”

An investigation on the field strength and loading rate dependences of the hysteretic dynamics of magnetorheological dampers

“…In other words, the force-velocity hysteresis loops for the same MR damper are different when the loading frequencies are different and also when the excitation electric currents are different. Furthermore, the dependences of the hysteretic dynamics on the field strength and the loading frequency are both in a nonlinear way (Li et al 2000;Dominguez et al 2004Dominguez et al , 2006. The analysis of the hysteretic dynamics itself normally is a complicated task because there are bifurcations involved in the dynamics; the field strength and the loading rate dependences make the modeling and analysis of the nonlinear responses of the MR dampers more challenging.…”

“…To investigate the field and loading rate dependences of the hysteretic dynamics, a modified Bouc-Wen model was proposed by explicitly incorporating the current excitation, loading frequency, and loading amplitude as model parameters (Dominguez et al 2006). Although the modified model did capture the loading frequency and the field strength dependences to some extent, the cost for the outcome is that twenty model parameters were introduced in the model.…”