Composite noise-attenuating panel system

A composite noise-attenuating panel system comprising a plurality of panels,

• wherein each of the plurality of panels includes
• a first subpanel,
• a second subpanel,
• a plurality of spacer blocks positioned between the first subpanel and the second subpanel to define one or more spaces between the first subpanel and the second subpanel, and,
• in each of the one or more spaces, a first internal mineral wool filler, wherein a width of the first internal mineral wool filler is less than a width of the space from the first subpanel to the second subpanel, such that a portion of the space remains as an air gap at a position between the first subpanel and the second subpanel, and
• wherein each of the first subpanel and the second subpanel of each of the plurality of panels includes
• an outer sheet metal layer,
• an inner sheet metal layer, and
• a second internal mineral wool filler between the outer layer and the inner layer.

A modular enclosure for a gas turbine engine,

• wherein the modular enclosure comprises a plurality of panels,
• wherein each of the plurality of panels includes
• a first subpanel,
• a second subpanel,
• a plurality of closed-cell foam spacer blocks positioned between the first subpanel and the second subpanel to define one or more spaces between the first subpanel and the second subpanel, and,
• in each of the one or more spaces, mineral wool, wherein a width of the mineral wool is less than a width of the space from the first subpanel to the second subpanel, such that a portion of the space remains as an air gap at a position between the first subpanel and the second subpanel, and
• wherein each of the first subpanel and the second subpanel of each of the plurality of panels includes
• an outer sheet metal layer,
• an inner sheet metal layer, and
• mineral wool between the outer layer and the inner layer.