Unit cell resonator networks for acoustic and vibration damping

A gas turbine engine component, comprising:

• a noise attenuation panel, including
• a first plurality of unit cells;
• a first plurality of mass elements disposed within the first plurality of unit cells,
• wherein the first plurality of unit cells includes a first periodic structure having a first unit cell, a second unit cell, a third unit cell, and a fourth unit cell, and
• wherein each of the first unit cell, the second unit cell, the third unit cell, and the fourth unit cell includes a central body interconnected via a plurality of lateral tubes extending from the central body, the first periodic structure forming a first lateral layer of unit cells;
• a second plurality of unit cells;
• and
• a perforated plate disposed between the first plurality of unit cells and the second plurality of unit cells.

A noise attenuation panel for a structure within a propulsion system, comprising:

• a first plurality of unit cells comprising a first plurality of mass elements disposed within the first plurality of unit cells,
• wherein the first plurality of unit cells includes a first periodic structure having a first unit cell, a second unit cell, a third unit cell, and a fourth unit cell,
• wherein each of the first unit cell, the second unit cell, the third unit cell, and the fourth unit cell includes a central body interconnected via a plurality of lateral tubes extending from the central body, the first periodic structure forming a first lateral layer of unit cells, and
• wherein the external surfaces of the first plurality of unit cells form a second plurality of volumes;
• and
• a second plurality of unit cells defining a noise attenuation flow path,
• wherein the second plurality of unit cells includes a second periodic structure having a fifth unit cell, a sixth unit cell, a seventh unit cell, and an eighth unit cell, and
• wherein each of the fifth unit cell, the sixth unit cell, the seventh unit cell, and the eighth unit cell includes a central body interconnected via a plurality of lateral tubes extending from the central body, the second periodic structure forming a second lateral layer of unit cells, and
• wherein the second plurality of unit cells is intertwined with the first plurality of unit cells such that the second plurality of unit cells is disposed of within the second plurality of volumes formed by the first plurality of unit cells.