Acoustic dampers for life support systems

A life support system comprising:

• a pressure garment;
• a helmet;
• and
• a life support system enclosure, wherein the pressure garment, the helmet, and the life support system enclosure define an enclosed environment, wherein the life support system enclosure includes one or more life support components configured to provide gas for breathing within the enclosed environment, and the gas is directed along a closed-loop cycle flow path through the helmet, the pressure garment, and the life support components,
• the life support components comprising:
• a fan for driving a flow of the gas through the closed-loop cycle flow path;
• and
• an acoustic damper arranged along the flow path and configured to reduce noise generated by the fan, the acoustic damper comprising:
• a housing defining an annular cavity arranged about a portion of the flow path, wherein the housing has a solid exterior surface and an inner diameter surface that comprises one or more openings to fluidly connect the flow path with the annular cavity;
• and
• at least one acoustic damping element arranged within the annular cavity, wherein the at least one acoustic damping element comprises at least one resonator acoustic damping element and at least one bulk absorber, wherein the at least one resonator acoustic damping element is configured as a ring-like structure within the annular cavity and the at least one bulk absorber is configured as a ring-like structure within the annular cavity.