Research on the Influence of Multiple Parameters on the Absorption Band Migration of Double Degrees of Freedom Aeronautical Sound Lining

The conventional double-degree-of-freedom aeronautical acoustic lining structure is fixed, as is its absorption band range. In view of the problem that the sound absorption band of traditional double-degree-of-freedom aeronautical acoustic linings cannot be offset adaptively with external noise and the sound absorption band is narrow, a parametric improvement study is conducted on the double-degree-of-freedom acoustic lining structure model, and the influence of multiple parameters on the movement of the sound absorption band is analyzed. The theory of a multi-parameter coordinated adjustment method for the movement of the sound absorption band is proposed, and the correctness and feasibility of the proposed method are verified through numerical calculation and simulation analysis. This paper provides a theoretical reference for the adaptive control design of a double-degree-of-freedom acoustic lining structure with adjustable sound absorption bands.