Method of making composite chambercore sandwich-type structure with inherent acoustic attenuation

摘要

An innovative new structure, called ChamberCore, is disclosed that is damage tolerant, easy to manufacture, and has an inherent design feature that can be exploited to drastically reduce acoustic transmission through the structure. The structure is composed of previously cured tubes that are sectioned to form chambers and co-cured with facesheets to form a sandwich-type structure. Damage tolerance is derived from the fact that the structure has no weak facesheet-core interface as found in traditional sandwich-type structures. Additionally, each chamber has a hole to it through the inner facesheet effectively converting it into a Helmholtz resonator. These resonators can be tuned to attenuate broadband or specific acoustic transmission through the structure.