A new active anti-vibration system using a magnetostrictive bimetal actuator

Mojtaba Ghodsi, Morteza Mohammadzahri, Payam Soltani, Hamidreza Ziaifar

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Abstract

This paper introduces a new vibration reduction system using a magnetostrictive (Fe-Ga alloy) bimetal actuator. The proposed method (i) uses a magnetostrictive bimetal actuator instead of prevalent single material ones that need an auxiliary temperature control system and (ii) utilises a novel disturbance rejection control scheme that eliminates an unknown disturbance, without needing knowledge of its dynamics. In experiments, the vibration source is demonstrated as an unbalanced motor attached to the tip of a cantilever beam, resembling a beam-like element subject to ambiance vibrations. In the first step, the fundamental of this anti-vibration system is introduced and described. Then, analytical and data-driven modelling for the combination of the beam, the motor, and the bimetal is reported. These follow by model validation and impulse response analysis. Then, the proposed control system is introduced in detail. Experimental results indicate that the control system results in 33.6% decrease in beam vibration amplitude. Furthermore, the presented method in this paper can be employed as a design guideline for future applications.
Original languageEnglish
Article number169463
Number of pages14
JournalJournal of Magnetism and Magnetic Materials
Volume557
Early online date16 May 2022
DOIs
Publication statusEarly online - 16 May 2022

Keywords

  • Active control
  • Magnetostrictive bimetal
  • Galfenol (Fe-Ga)
  • Feedforward control
  • System identification

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