Modelling and experimental characterisation of a compressional adaptive magnetorheological elastomer isolator

Abstract

This article proposes a simple physical-based model to describe and predict the performance of axially compressed magnetorheological elastomer cylinders used as vibration and shock absorbers. The model describes the magnetorheological elastomer macroscopic stiffness changes because of an externally applied magnetic field from a microscopic composite cell of silicone rubber and carbonyl iron particle. Despite neglecting the material hyperelasticity, anisotropy and adjacent magnetic interaction, the model describes effectively the effect of the magnetic field on the macroscopic modulus of elasticity. The changes in the mechanical properties with the induced magnetic field are measured on samples of different particle concentration based on volume percentage, that is, 10 and 30 percent concentration of iron particles in a silicone rubber matrix. The manufacturing process of the samples is detailed, as well as the experimental validation of the effective stiffness change under a magnetic field in terms of transmissibility and mobility testing. However, the prediction seems to be limited by the linear elastic material model. Predictions and measurements are compared, showing that the model is capable of predicting the tunability of the dynamic/shock absorber and that the proposed devices have a possible application in the reduction of mechanical vibrations.

Modeling and design of magnetorheological elastomer isolator system for an active control solution to reduce the vibration transmission in elevator context

“…In this section, the MR isolators are fabricated and characterized in static and dynamic compression tests. An electromagnet (Du et al, 2011; Jalali et al, 2020; Opie and Yim, 2011; Rustighi et al, 2022; Sun et al, 2015b) is going to be used to apply the magnetic field during measurements to characterize the magnetosensitive property following the procedure presented by Erenchun et al (2022a) to provide sufficient information to model an active control system.…”

Practical design of an electromagnet for the compression characterization of magnetorheological elastomers

“…Silicone rubber Carbonyl iron Silicone oil [6][7][8][9][10][11][12][13][14][15] (no additives) [4,[16][17][18][19][20] Natural rubber Carbonyl iron Silicone oil [21] (no additives) [2,22] Iron (no additives) [1,23] Room temperature vulcanizing silicone rubber (RTV) Carbonyl iron Silicone oil [24][25][26] Polyurethane Carbonyl iron (no additives) [27][28][29] Polydimethylsiloxane Carbonyl iron Vulcanizer [30,31] Table 2. MRE particle alignment.…”

In-Vacuo Structured Fabric Tuneable Vibration Absorber

“…The past three decades have seen a growing interest on Tunable Vibration Absorbers (TVA) [1], which can be effectively adopted to control either the harmonic response of mechanical systems subject to time-varying tonal excitations or the resonant response of time-varying mechanical systems subject to broadband stationary stochastic disturbances. Normally, TVA systems rely on electro-mechanical transducers to create a tuneable spring-mass-damper system, such as for example shape memory alloys [2,3], electrorheological and magnetorheological elastomers [4,5], coil-magnet devices connected to electrical shunts [6][7][8][9][10] and piezoelectric patch/stack materials connected to electrical shunts [11][12][13][14][15][16][17][18]. The stiffness of these systems can be controlled electrically such that the fundamental resonance frequency of the absorber can be suitably varied to track either the frequency of the tonal excitation acting on the hosting system or to track the resonance frequency that characterises the resonant response of a time varying hosting system subject to a broadband stochastic excitation.…”