Design of a Novel Magnetorheological Damper Adaptable to Low and High Stroke Velocity of Vehicle Suspension System

Abstract

In this study, a new class of magnetorheological (MR) damper, which can realize desired damping force at both low and high speeds of vehicle suspension systems, is proposed and its salient characteristics are shown through computer simulations. Unlike conventional MR dampers, the proposed MR damper has a specific pole shape function and therefore the damping coefficient is changed by varying the effective area of the main orifice. In addition, by controlling the opening or closing the bypass orifice, the drastic change of the damping coefficient is realizable. After briefly describing the operating principle, a mathematical modeling is performed considering the pole shape function which is a key feature of the proposed MR damper. Then, the field-dependent damping force and piston velocity-dependent characteristics are presented followed by an example on how to achieve desired damping force characteristics by changing the damping coefficient and slope breaking point which represents the bilinear damping property.

Dynamic analysis of semi-active MR suspension system considering response time and damping force curve

“…As shown in Figure 7, the control input profile of MR damper with addition flow path is smaller than that of MR damper without addition flow path. From Figure 7, the gradual gradient of damping force curve makes small control input profile and hence good ride comfort (Kim et al, 2020).…”

Design and experimental research of stepped bypass magnetorheological damper

“…In order to optimize the working performance of the magnetorheological damper, designed a new parallel-gap magnetorheological damper. By establishing the mathematical model of the parallel gap magnetorheological damper, the correctness of the structural design is verified and guided (Dong et al, 2019; Kim et al, 2020). Proposed a novel magnetorheological damper that can achieve the desired damping force at both high and low vehicle speeds.…”

Design and modeling of a magnetorheological damper with double annular damping gap

“…The last approach was to use numerical methods to obtain the controllable damping force and then calculate the viscous damping force in the absence of a magnetic field. For example, Ferdaus et al (2014), Xu et al (2013), Kim et al (2020), Han et al (2018), Nguyen et al (2008), and Hu et al (2016) used this method to calculate the damping force. In fact, both viscous damping force and controllable damping force include non-linear part in addition to linear part.…”