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Towards a self tuning sliding mass metastructure.

Mohammad A Bukhari1, Oumar R Barry2

  • 1Mechanical Engineering, Virginia Tech, Blacksburg, 24060, USA.

Scientific Reports
|November 4, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a passive self-tuning resonator using a sliding mass to overcome narrow frequency bands in vibration control. The novel metastructure effectively tunes to excitation frequencies for broad vibration reduction.

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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Applied Physics

Background:

  • Passive vibration control systems offer design simplicity and power independence.
  • A key limitation is their narrow operational frequency band, restricting effectiveness against variable disturbances.
  • Recent advancements explore passive self-tuning resonators utilizing sliding masses.

Purpose of the Study:

  • To analytically and experimentally investigate a passive self-tuning metastructure with a sliding mass.
  • To demonstrate the resonator's ability to adapt to excitation frequencies.
  • To validate the potential for wide-frequency band vibration reduction.

Main Methods:

  • Derivation of governing equations of motion, incorporating Coriolis and centrifugal forces.
  • Development of an adaptive algorithm using exact instantaneous mode shapes and frequencies.
  • Numerical simulations and experimental validation of the self-tuning mechanism.

Main Results:

  • The sliding mass is driven by inertial forces, enabling self-tuning.
  • The resonator successfully tunes to the excitation frequency as the slider reaches equilibrium.
  • Significant vibration reduction across a wide frequency band is achieved.

Conclusions:

  • The proposed passive self-tuning resonator effectively addresses limitations of traditional systems.
  • The validated model shows promise for vibration control in aerospace, automotive, and machining.
  • The concept can be extended to develop self-adaptive periodic structures (metamaterials).