Gear acoustic metamaterial bandgap sound insulation characteristics and optimized design
Mengting Xing, Zhaohua Yao, Lekai Li, Yu Sun, Xinhao Zhang, Caiyou Zhao · AIP Publishing · 2025
A gear acoustic metamaterial is optimized (via genetic algorithm) to widen its acoustic bandgap, yielding broadband noise reduction with experimentally reported ~29.6 dB insulation in the band.
Plain English summary
Why this matters
Key findings
- Genetic-algorithm optimization widens the first-order bandgap as the GAM structure evolves.
- The optimized structure’s first-order bandgap width is 3.55× that of structure A (improvement by 658 Hz).
- Simulated bandgap range (periodic boundary conditions): 1262–2178 Hz.
- In the bandgap range, time-domain excitation shows acoustic wave-blocking and strong transmission attenuation.
- Experimental STL results agree with simulations; reported actual sound insulation reaches 29.6 dB in the band.
Limitations
The abstract does not specify the number/type of gear geometry parameters optimized, the experimental setup details, robustness to manufacturing tolerances, or performance outside the reported bandgap range.
Publication
- Publisher
- AIP Publishing
- Publication date
- August 18, 2025
- Research type
- Paper
- License
- https://creativecommons.org/licenses/by/4.0/
Tags
More on Acoustic Metamaterials
See all →Active-Learning-Guided Acoustic Metamaterial Resonators for Low-Frequency Noise Suppression and Piezoelectric Energy Harvesting
Active-learning-guided inverse design enables scalable acoustic metamaterial resonators that suppress low-frequency noise and harvest acoustic energy using integrated piezoelectric stacks.
Hydrogel-based flexible metamaterial for underwater acoustic carpet cloaking
A hydrogel-based flexible metamaterial is proposed for underwater acoustic carpet cloaking.
Optimal Design of an Acoustic Lens with Anisotropic Metamaterial
By optimizing the sizes of random rigid scatterers in an anisotropic acoustic metamaterial, the lens achieves subwavelength focusing beyond the diffraction limit.
Invisible design and acoustic scattering of metamaterial plates with active feedback control
Active feedback-controlled metamaterial plates are designed to reduce low-frequency acoustic scattering by tuning dynamic effective density, enabling “invisible” behavior for underwater vehicles.
Thin Acoustic-Composite Structures With Metamaterial Inclusions for Enhanced Low-Frequency Sound Absorption
Thin porous acoustic composites with tunable labyrinthine metamaterial inclusions achieve enhanced low-frequency absorption via multiresonant behavior confirmed by acoustic tests.
Transmission loss of a labyrinthine acoustic metamaterial augmented with multichannel feedforward active noise control
A labyrinthine acoustic metamaterial is augmented with multichannel feedforward active noise control to improve transmission loss.
Recently published
Latest research →Bio-inspired re-entrant honeycomb metamaterial with programmable dual-plateau mechanical response
A bio-inspired re-entrant honeycomb mechanical metamaterial is described as having a programmable dual-plateau mechanical response.
Modelling the thermo-mechanical responses and shape recovery performance of particle-reinforced shape memory polymer composites in cold and hot programming
A study focused on modeling thermo-mechanical behavior and shape recovery of particle-reinforced shape-memory polymer composites when programmed in cold versus hot conditions.
Functional Shape Recovery Response of Heat-Treated NiTiCu SHAPE Memory Alloy Wire
Heat treatment of NiTiCu shape memory alloy wires enhances their shape recovery response, achieving a high recovery ratio.
Dorsiventrally Bicolored Leaf‐Inspired Metamaterial Absorbers for Tailorable Electromagnetic Absorption
This research proposes a bioinspired metamaterial that achieves high-performance, tailorable electromagnetic absorption across a broad frequency range.