Engine noise suppression kit for the nacelles of a jet aircraft

摘要

An engine noise suppression kit for use on the inside surfaces of the cowlings or doors of conventional jet aircraft nacelles surrounding the jet aircraft engines. Each nacelle cowling or door comprises a skin mounted on a framework made up of longitudinal stringers and transversely extending ribs or formers. The formers divide the inside surface of the nacelle cowlings or doors into bays surrounding the jet engine located within the nacelle. The kit comprises a plurality of sound attenuating modules adapted to be affixed to an adjacent pair of cowling or door formers and to span the bay defined thereby such that at least those bays surrounding the combuster chamber/turbine area of the jet engine are covered by said modules. Each module constitutes a sealed metallic basket comprising a pair of perforated metallic panels spaced from each other by a surrounding metallic framework. The facing surfaces of said metallic panels being covered by silicon rubber-coated glass cloth. Acoustic material fills the remaining space between said panels. The surrounding metallic framework of each module has laterally extending flanges by which the module is attached to those formers defining its respective bay. The modules are arranged end to end in their respective bays.