Composite sound absorption superstructure based on multi-frequency resonance and design method thereof

The multi-resonance composite absorption structure effectively addresses the limitations of existing absorption structures by integrating high-frequency and low-frequency components with multi-perforated materials, enhancing low-frequency absorption and noise reduction across a broader frequency range, suitable for vehicle noise suppression.

CN119724139AActive Publication Date: 2025-03-28HUAZHONG UNIV OF SCI & TECH
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Patent Information

Application Number
CN202411850466.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-16
Publication Date
2025-03-28
Estimated Expiration
2044-12-16

AI Technical Summary

Technical Problem

Current absorption structures for vehicles are ineffective in addressing low-frequency noise due to their narrow absorption frequency bands and large size, which limits their practical application in suppressing wide-frequency noise pollution.

Method used

A composite absorption structure utilizing a combination of high-frequency and low-frequency absorption structures, integrated with multi-perforated materials, designed through a multi-resonance approach where high-frequency absorption structures and low-frequency structures are coupled using 3D printing with light-sensitive resin, optimizing the arrangement of cells and inserts to enhance absorption across a broader frequency range.

Benefits of technology

The structure achieves a significant enhancement in low-frequency absorption capabilities, broadening the absorption frequency band and improving overall noise reduction performance, making it more practical for engineering applications by maintaining a compact and lightweight design.

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Abstract

The invention discloses a composite sound absorption superstructure based on multi-frequency resonance and a design method thereof. The composite sound absorption superstructure based on multi-frequency resonance comprises a high-frequency sound absorption structure, a low-frequency sound absorption structure and a porous sound absorption material, the high-frequency sound absorption structure and the low-frequency sound absorption structure are filled with the porous sound absorption material, and the high-frequency sound absorption structure is formed by mutually connecting and embedding a plurality of cell elements which are located on the same layer and arranged at the same height. The low-frequency sound absorption structure comprises a plurality of cell elements which are equal in height and arranged in parallel in the linear direction, the low-frequency sound absorption structure is located below the high-frequency sound absorption structure, and the high-frequency sound absorption structure and the low-frequency sound absorption structure are integrally formed through 3D printing by adopting photosensitive resin. The sound absorption structure provided by the invention has a plurality of different sound absorption peaks, so that the low-frequency sound absorption frequency band is widened, and the low-frequency broadband sound absorption capability is remarkably enhanced.
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