Design and Development of Multi-Mode Magneto-Rheological Fluid Mount for Structural Vibration Isolation

Abstract

Purpose: The study investigates the application of Magneto-Rheological Fluid (MRF) mounts as semi-active vibration control solutions for critical structures, with the primary objective of developing a unique multi-mode MRF mount and in-house MRF optimization for effective vibration isolation. Methods: In-house MRF is synthesized with varying carbonyl iron particle concentrations and characterized to understand its rheological behavior under different current levels. A unique multi-mode MRF mount is developed to operate simultaneously in squeeze, flow, and shear modes, utilizing a translatory-to-rotary motion conversion mechanism. Magneto-static analysis of various design configurations is conducted in ANSYS to achieve a higher magnetic flux density across the MRF gap—a critical parameter for MRF mount performance. The configuration yielding the highest magnetic flux density is selected for fabrication and is tested with in-house MRF samples under varying currents. Based on the characterization results, fluid optimization is performed using Response Surface Methodology (RSM) to maximize damping ratio and yield stress, which directly impact vibration isolation performance. Modal analysis of a specific structure is conducted to determine its characteristics, followed by forced vibration analysis with MRF mounts powered individually at varying currents. Results: Transmissibility plots demonstrate that the developed multi-mode MRF mount effectively reduces vibrations, achieving up to 48% isolation under applied currents. Conclusion: The multi-mode MRF mount shows strong potential as a semi-active vibration isolation solution. Its significant vibration isolation capability under current influence highlights its suitability for various critical structures and supports its use in vibration-sensitive applications. © Springer Nature Singapore Pte Ltd. 2025.