Biviscous damping behavior in electrorheological shock absorbers

Abstract

Electrorheological (ER) and magnetorheological flow mode dampers can exhibit biviscous damping behavior. Such behavior is characterized by a high damping pre-yield region for low velocities, with a transition to a relatively lower post-yield damping, once the damper force exceeds the static yield force of the damper. The biviscous damping behavior is typically the result of leakage, that is, a second path of Newtonian flow in addition to the Bingham plastic flow through the ER or MR valve. We experimentally demonstrate such bilinear damping behavior in a monotube ER shock absorber. Leakage is typically introduced to smooth the force response of the damper as the damper undergoes transitions through the low velocity. The ER fluid is typically assumed to behave as a Bingham plastic fluid. Thus, two perspectives are examined for modeling damping performance of the ER monotube shock absorber. First, the quasisteady Bingham plastic analysis is coupled with a mechanical analysis of the leakage effects. Second, a biviscous constitutive perspective is described that allows the leakage effects to be described as an apparent pre-yield viscosity of the ER fluid. Both perspectives prove to be useful in describing damping performance of the ER monotube shock absorber.

Modeling and testing of a field-controllable magnetorheological fluid damper

“…In this model, the damping behavior is due to leakage, defined as a second path of Newtonian flow in addition to the Bingham plastic flow through an ER/MR valve. Leakage is typically introduced to smooth the force response of the damper as the damper undergoes transitions through the low velocities, whereas in the absence of leakage ER/MR dampers usually exhibit a highfrequency chatter in their force response [16]. As can be seen from Fig.…”

“…Therefore, a dynamic hysteresis model is needed to simulate the hysteresis phenomenon of MR dampers. To this end, various models have been proposed in the literature such as parametric viscoelastic-plastic model based on the Bingham model [9], the Bouc-Wen model [17], non-parametric models [18], and many more. In this study, the model used by Guo and Hu [1] to define an additional nonlinear stiffness is exploited and modified to give more accurate results.…”

“…However, accurate models are still needed in order to understand and predict the operational and dynamic behavior of such devices. Although various models both in non-parametric and parametric have been recently proposed to capture the dynamic behavior of MR fluids and their devices, the simplest one is the Bingham plastic model, which is a steady-state model assuming that the fluid is in the post-yield phase and is flowing at a constant shear rate [2,8,9,10]. However, since the magnetically active gap, through which MR fluid flows, is relatively small compared to radius of annulus, it is seen in the literature that the infinitely wide parallelplate approximation of the flow has been extensively used to capture the dynamic behavior of MR dampers [11,12].…”

Development of a linear damper working with magnetorheological shear thickening fluids

“…The media used to fill the dampers can be field dependent fluids, such as the electroheological fluids (ERF) and the magnetorheological fluids (MRF), which will undergo obvious changes in their rheological properties in response to the variations of the electric and magnetic and all of the alterations is completely reversible (Popp et al, 2010;Bonnecaze and Brady, 1992). Many applications use their varying fluidity in either damping or torque transfer scenarios (Wereley et al, 2004;Liu et al, 2006) (Lee and Wagner, 2003;Franks et al, 2000;Hasanzadeh and Mottaghitalab, 2014;Soutrenon and Michaud, 2014). And STFs have been used for different applications.…”

Algebraic Modeling of a field-controllable Magnetorheological fluid damper

“…Therefore, a dynamic hysteresis model is needed to simulate the hysteresis phenomenon of MR dampers. To this end, various models have been proposed in the literature such as parametric viscoelastic-plastic model based on the Bingham model [5], the Bouc-Wen model [6], nonparametric models [7], and many more. Thus the success of MR dampers in semi-active control is determined by the accurate modelling of the MR damper.…”