Design and Analysis of Aero-Engine Acoustic Liner Structure with Adjustable Absorption Frequency

In order to solve the problem that the absorption frequency of the traditional honeycomb micro-perforated panel acoustic liner is fixed and can’t be adjusted in the face of complex noise environment, Aero-engine acoustic liner with adjustable sound absorption frequency is to be designed, a single cell in the honeycomb micro-perforated panel acoustic liner is designed and analyzed, and a broadband and telescopic micro-perforated panel sound absorption structure is proposed. Using a structure of micro-perforated plates in series with unequal diameters to expand the range of structural sound absorption frequencies, and achieving the goal of adjustable sound absorption frequencies through a structure designed with telescopic unequal diameters. Simulation results show that it can be tuned in the frequency of 1000–3000 Hz. The acoustic liner design proposed in this paper has a simple structure and strong adaptability in the face of complex noise environment, and has a good engineering application prospect.