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Purpose <p>Magnetorheological elastomers (MREs) are elastomeric materials containing homogeneously dispersed magnetic particles that allow adjustable viscoelastic properties in response to a magnetic field. This property, known as the magnetorheological (MR) effect, is beneficial for semi-active vibration isolation. However, MREs face limitations, including slow response times, suspension of particles within the elastomeric matrix, and weak damping capabilities. To address these challenges, a hybrid MRE (MRE-F) is developed by encapsulating MR fluid within the elastomer, aiming to improve vibration isolation performance.</p> Methods <p>Three MRE samples, including the hybrid MRE-F, are fabricated and tested to evaluate their stiffness and damping properties under varying conditions. Torsional vibration experiments are conducted at different magnetic field intensities to assess the materials' effectiveness in isolating torsional vibrations.</p> Results <p>The hybrid MRE-F sample demonstrates superior performance compared to other samples, showing the highest shift in natural frequency (15.2%), the highest relative MR-effect (34.56% at 3 A), and the greatest increase in damping (25.35% at 3 A). These findings highlight the enhanced capability of MRE-F to reduce torsional vibrations due to its rapid response to the magnetic field.</p> Conclusion <p>Hybrid MRE-F, characterized by magnetic particles suspended in silicone oil, exhibits the highest MR-effect and damping properties among the tested samples. This suggests significant potential for hybrid MRE-based couplings in torsional vibration isolation applications, addressing the limitations of traditional MREs.</p>

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Fluid-Encapsulated Magnetorheological Elastomer for Semi-active Isolation of Torsional Vibrations

  • 期刊论文

  • 发表日期：

    2025年3月13日

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  • Abdelrahman Ali,
  • Ayman M. H. Salem,
  • Asan G. A. Muthalif

摘要

Purpose

Magnetorheological elastomers (MREs) are elastomeric materials containing homogeneously dispersed magnetic particles that allow adjustable viscoelastic properties in response to a magnetic field. This property, known as the magnetorheological (MR) effect, is beneficial for semi-active vibration isolation. However, MREs face limitations, including slow response times, suspension of particles within the elastomeric matrix, and weak damping capabilities. To address these challenges, a hybrid MRE (MRE-F) is developed by encapsulating MR fluid within the elastomer, aiming to improve vibration isolation performance.

Methods

Three MRE samples, including the hybrid MRE-F, are fabricated and tested to evaluate their stiffness and damping properties under varying conditions. Torsional vibration experiments are conducted at different magnetic field intensities to assess the materials' effectiveness in isolating torsional vibrations.

Results

The hybrid MRE-F sample demonstrates superior performance compared to other samples, showing the highest shift in natural frequency (15.2%), the highest relative MR-effect (34.56% at 3 A), and the greatest increase in damping (25.35% at 3 A). These findings highlight the enhanced capability of MRE-F to reduce torsional vibrations due to its rapid response to the magnetic field.

Conclusion

Hybrid MRE-F, characterized by magnetic particles suspended in silicone oil, exhibits the highest MR-effect and damping properties among the tested samples. This suggests significant potential for hybrid MRE-based couplings in torsional vibration isolation applications, addressing the limitations of traditional MREs.