Aeroengine noise, which is the main noise source of modern aircraft, has an inevitable negative effect on the health and life of people. There is a growing need to reduce aeroengine noise. Acoustic liners are crucial components of nacelles to damp aeroengine noise. However, the wide range of engine operating frequencies and narrow installation space of the aeroengine make the design of the traditional acoustic liner with large size and narrow absorption not meet demands. Therefore, the design of a broadband acoustic liner with a compact size is a hot issue to date. In this work, a new broadband metasurface acoustic liner design method is proposed based on the quadratic residual sequence (QRS) that is a typical sequence of Schroeder diffuser sequences. Single-degree-of-freedom (SDOF) liners are permutated by QRS to prove the feasibility of it for broadband sound absorption. In addition, the technique of metasurface is introduced to minimize the thickness of the acoustic liner. Numerical results show that the 50% absorption bandwidth of the QRS liner can be over 10 times than those with linear sequences (LS) in the range of 200 to 1,200 Hz. The thickness of acoustic liner reduces by 87.2% with the application of metasurface. The ratio of the new broadband metasurface acoustic liner thickness to the wavelength at the lowest absorption peak is less than 1.75%, confirming its operation in the deep subwavelength regime. The Fourier transform of the QRS sequence value has the property of constant amplitude, so it can be used to broaden the sound absorption of coupled liners. This work provides a new broadband acoustic liner and, more importantly, may motivate the application of digital sequences to solve broadband sound absorption problems.


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    Title :

    New Broadband Metasurface Acoustic Liner Design Method Based on a Schroeder Diffuser Sequence


    Additional title:

    J. Aerosp. Eng.


    Contributors:
    Ma, Pengwei (author) / Wang, Han (author) / Liu, Yongquan (author) / Jin, Xiaochao (author) / Wang, Fengming (author) / Fan, Xueling (author)

    Published in:

    Publication date :

    2022-07-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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