Modelling and Analysis of a Magnetorheological Damper with Nonmagnetized Passages in Piston and Minor Losses

Abstract

is work aims to establish the mathematical model with the high effectiveness in predicting the damping force of an MR damper with nonmagnetized passages in piston. e pressure drops due to viscous loss, MR effect, and the minor losses at the inlet and outlet of passages are considered in the mathematical model. e widely reported Bingham model is adopted to describe the mechanical property of MR fluid. e mechanical behaviours of the MR damper are experimentally evaluated under different excitations and current. e yield stress of MR fluid with respect to the current applied to piston coil is obtained by finite element analysis in Ansoft Maxwell 14.0. e proposed model is validated by comparing the simulated damping characteristics with the measured data under various currents applied to the piston coil. e simulated results are also compared with those obtained from the mathematical model without the pressure drop due to the minor losses at the inlet and outlet of passages. e comparisons show that the proposed mathematical model can yield more accurate predictions of damping force. is indicates that the pressure drop due to the minor losses is significant and nonnegligible. e nonlinearity of force-velocity characteristics is discussed. In order to quantitatively explain the necessity of taking the minor losses into account for modelling the MR damper, the proportion of pressure drop due to the minor losses to the total pressure drop is investigated and discussed. Pressure drops due to the minor losses and viscous loss are also investigated and discussed. At last, the proposed mathematical model is used to analyse the working principle of nonmagnetized passages.

The Effect of Dolphin Echolocation-Fuzzy Logic Controller in Semi-active control of structural systems by using endurance time method

“…Furthermore, it is important to reduce the cost of purchase, installation, operation and maintenance of the semi-active devices [10]. Several researches have been investigated on optimal arrangement of dampers [11] but optimal MR damper arrangement and their sensors as two discrete subjects have not paid attention yet [12][13][14].…”

Unsteady extension of quasi-steady physical modeling and experimental verification of a magnetorheological energy absorber

“…MR fluid, however, is still advantageous for its effectiveness and efficiency when adopted for vibration suppression and shock absorption because of the quick and reversible change in the yielding stress under the applied magnetic field, and thus the apparent viscosity. which are less troubled by the performance estimation because they are in pure shearing mode, and reciprocal types such as MR damper (Wang et al, 2018;Li and Yang, 2020;Sheng et al, 2022) and MR energy absorber (MREA), which are always employed for vibration and shock mitigation. The MR damper is mostly utilized in an automotive suspension, however, the MREA is mostly employed in a high-speed impact such as an anti-recoil system of artillery (Li and Wang, 2012), there are difficulties in the behavior prediction to an extent because of the working modes based on pressure differences resulting from piston movement.…”

Singularity-Free Adaptive Controller for Uncertain Hysteresis Suspension Using Magnetorheological Elastomer-Based Absorber

“…e semiactive vibration system usually exhibits a stable hysteretic state. e Bouc-Wen hysteresis model (BWM) is widely used to represent the properties of MR materials which have attracted researchers to develop intelligent vibration systems [25,26].…”