Experimental testing and modelling of a rotary variable stiffness and damping shock absorber using magnetorheological technology

Abstract

This article presents a novel rotary shock absorber which combines the abilities of variable stiffness and variable damping by assembling a set of two magnetorheological damping units, one of which being placed in series with a rubber spring. This allows the damping and stiffness to be controlled independently by the internal damping and the external damping units, respectively. A test bench was

A novel feature selection algorithm based on damping oscillation theory

“…Damping oscillation [31,32] refers to the vibration that the amplitude of the vibration system gradually attenuates with time due to friction and medium resistance or other energy consumption, also known as damping oscillation and damping oscillation. Whether it is a spring vibrator or a single pendulum, since external friction and medium resistance always exist, in the process of vibration, it must constantly overcome the external resistance to do work, consuming energy, and as the amplitude will gradually decrease, after a period of time, the vibration will completely stop.…”

Numerical analysis of the hydrodynamic behavior of a magnetoreological fluid

“…Research is also being conducted regarding the use of MR fluids in dampers used for building and bridge foundations (Ding, Y, Zhang, L, Zhu, H-T, et, 2013;Wu, 2010), railway suspension (Kim, H-C, Shin, Y-J, You, W, et, 2016) for the protection of these against earthquakes as it absorbs vibrations produced during these natural phenomena, they can also be found in tracked vehicles such as military and agricultural trucks (Ata, WG, Oyadiji, 2014), in the medical area have been investigated prostheses in which motors will be eliminated and therefore decreases its weight since the size of the prosthesis is reduced obtaining the same or even better performance and response time compared to other prostheses, strength is provided to the fingers or arm, in the case of leg prosthesis, it improves the walking gait, which benefits the individuals who use it, since they have a more uniform gait and therefore will not have a hip deformity as a consequence of using a prosthesis (Case, D, Taheri, B, Richer, 2014;Qiang, F, Wang, D-H, Lei, X, et, 2017), and in recent years, MR dampers were investigated to incorporate features to make it more functional, also it has attracted more interest recently in studying the damping force in MR dampers (Deng, L, Sun, S, Christie, MD, et, 2019;Huang, H, Sun, S, Chen, S, et, 2019).…”

A review on multi-physics numerical modelling in different applications of magnetorheological fluids

“…In the past 10 years, MR dampers were researched to incorporate self-powering, self-controlling and energy harvesting characteristics in order to operate in the absence of a power source (Chen and Liao, 2012; Sapiński, 2011; Wang and Wang, 2009; Wang et al, 2010). Also, research on MR dampers with variable stiffness and damping force has attracted more interest recently (Deng et al, 2019; Huang et al, 2019).…”

“…The performances of these applications are found to improve significantly due to the rapid, reversible and controllable characteristics of MR fluids (Wang and Liao, 2011). Examples of these applications are journal bearings (Bompos and Nikolakopoulos, 2011), hydraulic valves (Bullough et al, 2008; Nguyen et al, 2008), micro-pumps (Liang et al, 2018), smart clutches (Ellam et al, 2006; Zhang et al, 2019), rotary MR dampers (Deng et al, 2019; Wang et al, 2019), robotics (Hartzell et al, 2019; Hwang et al, 2019), energy harvesters (Deng and Dapino, 2015; O’Donoghue et al, 2016), rheometers (Allebrandi et al, 2020), human prosthesis (El Wahed and Wang, 2019), engines mounts (Do and Choi, 2015), and hybrid body armours (Son and Fahrenthold, 2012). So far, there have been fewer studies on the employment of MR fluids in these applications compared to research efforts on linear MR dampers (Galindo-Rosales, 2016).…”