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Purpose <p>Excessive vibration in lightweight laboratory platforms degrades measurement accuracy and accelerates fatigue. This study develops and evaluates a low-cost, single-degree-of-freedom (1-DOF) testbed that combines anti-phase (180°) actuation with interchangeable granular mounts to widen suppression bandwidth and demonstrate reproducible teaching-lab experiments.</p> Methods <p>The testbed utilizes two phase-locked eccentric-mass DC motors driven in anti-phase actuation, paired with an ESP32–ADXL345 acquisition system. Interchangeable granular mounts, including sand or coffee, are selected for equal static stiffness. A nonlinear, velocity-dependent (power-law) damping model, tailored to the granular media, is implemented in OpenModelica and validated against experimental data. Acceleration records are calibrated, spectrally integrated for displacement when required, and analyzed using FFT-based methods.</p> Results <p>Anti-phase actuation significantly reduces the dominant resonance response. For equal static stiffness, granular mounts (sand or coffee) exhibit broader-band attenuation. The power-law damping model effectively captures key experimental trends, confirming its utility for comparative design studies.</p> Conclusions <p>This platform combines modeling and experimental validation using affordable hardware, facilitating reproducible demonstrations of active vibration suppression. The findings offer practical insights for selecting and optimizing granular mounts in low-frequency disturbance environments, advancing the integration of passive granular damping with anti-phase actuation.</p>

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Design and Experimental Study of a Vibration Damping System using Granular Mounts with Anti-phase (180°) Actuation

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • Mohammad Parsa Sadoughifar

摘要

Purpose

Excessive vibration in lightweight laboratory platforms degrades measurement accuracy and accelerates fatigue. This study develops and evaluates a low-cost, single-degree-of-freedom (1-DOF) testbed that combines anti-phase (180°) actuation with interchangeable granular mounts to widen suppression bandwidth and demonstrate reproducible teaching-lab experiments.

Methods

The testbed utilizes two phase-locked eccentric-mass DC motors driven in anti-phase actuation, paired with an ESP32–ADXL345 acquisition system. Interchangeable granular mounts, including sand or coffee, are selected for equal static stiffness. A nonlinear, velocity-dependent (power-law) damping model, tailored to the granular media, is implemented in OpenModelica and validated against experimental data. Acceleration records are calibrated, spectrally integrated for displacement when required, and analyzed using FFT-based methods.

Results

Anti-phase actuation significantly reduces the dominant resonance response. For equal static stiffness, granular mounts (sand or coffee) exhibit broader-band attenuation. The power-law damping model effectively captures key experimental trends, confirming its utility for comparative design studies.

Conclusions

This platform combines modeling and experimental validation using affordable hardware, facilitating reproducible demonstrations of active vibration suppression. The findings offer practical insights for selecting and optimizing granular mounts in low-frequency disturbance environments, advancing the integration of passive granular damping with anti-phase actuation.