Innovative Honeycomb Design for Low Frequency Applications

This work is centered on the design and development of a novel honeycomb structure configuration that is industrially feasible, aiming to create increase the acoustic performances keeping the mechanical properties. In particular, the goal of this study is to improve the sound absorption coefficient of this structure at lower frequencies. The reference case for this study is the sandwich panels utilized in the construction of aero-engine liners, consisting of a rigid plate at the bottom, a honeycomb core, and a micro-perforated panel as the upper skin to facilitate interaction with flow. In order to ensure the comparability of the proposed configuration with commercially available counterparts, the external macro geometry of the panel remains consistent. Notable variations, as illustrated in the presented models, are confined to the internal structure of the honeycomb. To validate the numerical results obtained in Comsol Multyphisics thus far and to explore the implications arising from the reduction in the number of inlet holes characteristic of this new structure, experimental tests are planned. These tests will serve to corroborate the numerical findings and contribute to a comprehensive understanding of the performance of this innovative honeycomb configuration.