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Item Experimental investigation of rotor wound multi disc magneto-rheological fluid brake(SAGE Publications Ltd, 2025) Bhat, S.H.; A, A.; Naveen, S.; Kumar, H.; M, A.Magneto-Rheological fluid (MRF), known for changing properties under a magnetic field, is ideal for brakes and dampers in magnetically controlled devices. This research presents a novel design for a 10-disc MR brake using in-house Magneto-Rheological Fluid (MRF), distinguished by its integration of electromagnet windings directly onto the brake shaft. Magneto-static analysis, performed using Finite Element Method Magnetics (FEMM) software, optimized the material selection and dimensions, enhancing the magnetic field distribution across the MRF gap and maximizing braking torque. The design, with rotor windings and a consistent MRF gap, generates a uniform magnetic field, significantly boosting performance. Theoretical braking torque was estimated using Bingham plastic model for MRF characterization, aligning well with experimental results. The compact 10-disc MR brake design, weighing 1.19 kg, shows robust torque performance across varying current levels. Remarkably, prior research had not integrated electromagnet windings directly on the rotor of MR brake, marking this study as pioneering in advancing MR brake performance. © The Author(s) 2025.Item Design and Development of Internal Wound Magnetorheological Elastomer Mount for Structural Vibration Isolation(Springer, 2025) Bhat, S.H.; Saroj, A.A.; Kumar, H.; Arun, M.; Vaidyanathan, R.V.Vibration isolation of structures is crucial for enhancing reliability when subjected to mechanical vibrations and shocks. This research investigates the application of Magneto-Rheological Elastomer (MRE) mounts to mitigate vibrations in a 15 kg structure. A unique MRE mount with internal windings was designed and developed using magneto-static analysis with maximizing magnetic flux density across MRE through the Design of Experiments (DoE). MRE samples were prepared considering 20, 40 and 60% (wt.) carbonyl iron particle (CIP) content within a silicon elastomer matrix and analyzed under a rheometer. Further, these MRE samples were considered for forced vibration studies with structures placed on MRE mounts across different frequencies. Repeated experiments with all in-house MRE samples demonstrated that the MRE mount significantly mitigated vibrations at different currents and compositions. The transmissibility plot revealed a maximum amplitude reduction of 3.73 times for the 60% MRE sample. These results underscore the importance of optimizing MRE mount and CIP content for effective vibration isolation, which is vital for prolonging the operational lifespan of critical structures. © The Institution of Engineers (India) 2025.Item Design and Development of Multi-Mode Magneto-Rheological Fluid Mount for Structural Vibration Isolation(Springer, 2025) Bhat, S.H.; Kumar, H.; Arun, M.; Vaidyanathan, R.V.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.