Server Fan Noise Attenuation and Frequency Tuning via Planar Auxetic Metamaterials With Helmholtz Resonator
Journal
Journal of Vibration and Acoustics
Journal Volume
148
Journal Issue
2
Start Page
021012
ISSN
10489002
Date Issued
2026-04-01
Author(s)
Abstract
This study modeled a ventilation-type acoustic metamaterial based on planar auxetic metamaterials combined with Helmholtz resonators (PAMHR). The coupling between the resonators enables tuning the resonance frequency, and the integrated planar auxetic design enables coupling control across large arrays of Helmholtz resonators. This modular structural design achieved 45% ventilation and millimeter-scale dimensions. The PAMHR was found to perform well in theoretical analyses, numerical simulations, and experiments. PAMHR does not require complex external mechanisms to deform the resonators; instead, it relies on coupling effects to tune the structural resonance frequency. The tunable resonance frequency range exceeded 200 Hz, and its thickness is only 1/15 of the operating wavelength. When installed in a server, PAMHR effectively reduces fan noise and enhances hard drive performance by 25%, validating its added value in practical engineering applications and offering innovative insights into the integration of planar auxetic metamaterials with Helmholtz resonators.
Subjects
acoustic metamaterial
Helmholtz resonator
noise control
structural acoustics
Publisher
American Society of Mechanical Engineers (ASME)
Type
journal article