Low-frequency ventilation and sound insulation metamaterial

By designing a mid-to-low frequency ventilation and sound insulation supermaterial and utilizing Helmholtz resonators and multiple HR combinations, the contradiction between noise reduction and ventilation efficiency in mid-to-low frequency noise treatment materials has been resolved, achieving efficient sound insulation and ventilation effects, which is suitable for mass production.

CN122245267APending Publication Date: 2026-06-19ZHEJIANG UNIV
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG UNIV
Filing Date
2026-02-12
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing low- and medium-frequency noise reduction materials present a contradiction between noise reduction and ventilation efficiency. Furthermore, high-performance materials are complex to manufacture and costly, making them difficult to apply widely. Porous materials may also pose health risks.

Method used

A mid-to-low frequency ventilation and sound insulation metamaterial is designed, which includes a parametrically designed sound-absorbing functional cavity. It utilizes the resonance characteristics of Helmholtz resonators and multiple HR combinations, combined with a hollow tube ventilation path, to achieve broadband sound insulation through simple radial partitioning and cavity coherent coupling characteristics.

Benefits of technology

It achieves wideband sound insulation in the mid-to-low frequency range, reduces transmission loss to below 0.1dB, has high ventilation efficiency, simple structure for easy processing, low cost, and is suitable for mass production.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122245267A_ABST
    Figure CN122245267A_ABST
Patent Text Reader

Abstract

This invention discloses a mid-to-low frequency ventilation and sound insulation metamaterial comprising two main areas: sound absorption and ventilation. The sound absorption area is divided into inner and outer rings, each composed of multiple circumferentially arranged sound-absorbing functional cavities. Each functional cavity includes a resonant cavity formed by partitions and a perforated cavity formed by micro-perforated plates. The perforations on the plates are positioned according to the centroid of the vertical projection of the functional cavities. The ventilation area is a cylindrical region enclosed by the inner ring functional cavities, forming a complete resonant cavity via a ring-shaped base plate. This material combines the resonant characteristics of a Helmholtz resonator, achieving mid-to-low frequency broadband sound insulation through multiple parallel HR combinations. The hollow tube design ensures ventilation, and the mid-to-low frequency band utilizes a non-local coupling sound absorption mechanism for sound insulation. A 4.6cm thick specimen can block 90% of incident wave energy (TL≥10dB) in the 435~1700Hz range, and customized designs can be achieved simply by adjusting the aperture. The improved design incorporates a connecting small hole in the center of the inner and outer functional cavity partitions to form a connected functional cavity, bridging the gap between resonance absorption peaks and enhancing low-frequency sound absorption. The improved unit can achieve the same sound insulation effect in the range of 385~1700Hz.
Need to check novelty before this filing date? Find Prior Art