Method for manufacturing an acoustic attenuation structure with control of the positioning of an acoustic skin

A method for manufacturing an acoustic attenuation structure comprising:

• making a complex acoustic multi-element panel comprising a plurality of hollow complex acoustic elements each having a shape gradually narrowing between a base and a top and a plurality of partitions forming acoustic cavities, each complex acoustic element being housed in an acoustic cavity so as to form an acoustic cell,
• making a first skin,
• piercing a plurality of perforations on the first skin at determined locations so as to form a multi-perforated acoustic skin,
• assembling a face of the complex acoustic multi-element panel with an assembly face of the multi-perforated acoustic skin,
• wherein the multi-perforated acoustic skin comprises on its assembly face a plurality of positioning studs present at determined locations, each positioning stud being configured to cooperate with a hollow complex acoustic element or an acoustic cavity during the assembly of the complex acoustic multi-element panel with the multi-perforated acoustic skin and in that one or several positioning studs have a shape complementary to an inner shape of the hollow complex acoustic elements.