Acoustic metamaterial suitable for leading edge slat, design method and slat

By designing and adaptively arranging acoustic metamaterials within the leading-edge slats, the problems of noise reduction schemes affecting lift and insufficient space in existing technologies have been solved, achieving efficient suppression of mid-to-low frequency broadband noise and significantly improving the noise reduction effect.

CN121640975APending Publication Date: 2026-03-10NORTHWESTERN POLYTECHNICAL UNIV +1
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Patent Information

Application Number
CN202511828714.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-05
Publication Date
2026-03-10

AI Technical Summary

Technical Problem

Existing noise reduction solutions for aircraft leading-edge slats affect airfoil lift and fail to absorb low-frequency sound due to insufficient space, making it difficult to effectively suppress mid-to-low frequency broadband noise in confined spaces.

Method used

The design utilizes acoustic metamaterials suitable for leading-edge slats. By conformally arranging linear and curved sub-units, combined with micro-perforated plates and cavity structures, the acoustic impedance parameters are optimized to form an overall structure that matches the geometric profile of the slat, achieving efficient suppression of mid-to-low frequency broadband noise.

Benefits of technology

While maintaining aerodynamic performance, it significantly enhances the sound absorption performance of low and medium frequency noise, achieving wideband noise reduction in confined spaces with an average noise reduction of 1.7dB and a sound absorption coefficient of 0.80 in the 1030-2000Hz frequency range, demonstrating excellent engineering applicability.

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Abstract

The invention provides an acoustic metamaterial suitable for a leading edge slat, a design method and the slat, and belongs to the field of aircraft noise reduction. The acoustic metamaterial comprises a plurality of acoustic metamaterial subunits, and each subunit is composed of a micro-perforated plate and a cavity. And at least one of the plurality of subunits is linear and the internal channel of the cavity is linear, and at least one of the plurality of subunits is curved and the internal channel of the cavity is curved. The linear and curved subunits form a conformal unitary structure by an adaptive arrangement including profile adaptation within the airfoil profile and location distribution and combination within a profile perpendicular to the airfoil profile and along the leading and trailing edges. According to the invention, extremely limited space in the slat is utilized to the maximum extent through conformal design, a sound wave propagation path is prolonged at a sub-wavelength scale through linear and curved cavity channels, efficient low-frequency sound absorption is realized, broadband noise is covered through combination of multiple subunits, and the problem of insufficient low-frequency sound absorption in a slat space in a traditional scheme is effectively solved.
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