Active/passive distributed absorber for vibration and sound radiation control

A distributed active vibration absorber (DAVA) for controlling vibration and sound radiation over an extended area of a vibrating structure, comprising:

• an active elastic layer including a distributed actuator embedded within an elastic material, said active elastic layer is distributed along an area of the vibrating structure;
• and
• a plurality of discrete mass segments associated with the elastic material of the active elastic layer.

A vibration absorber for controlling vibration and sound radiation over an extended area of a vibrating structure, comprising:

• an elastic layer formed from an elastic material, said active elastic layer is distributed along an area of the vibrating structure;
• and
• a plurality of discrete mass segments associated with the elastic material of the active elastic layer.

A vibration absorber for controlling vibration and sound radiation over an extended area of a vibrating structure, comprising:

• an elastic layer distributed over said extended area of said vibrating structure;
• a mass positioned on said elastic layer which is spaced away from said vibrating structure by a thickness of said elastic layer, said mass having a plurality of perforations extending therethrough.

A vibration absorber for controlling vibration and sound radiation over an extended area of a vibrating structure, comprising:

• a distributed elastic element positioned over said extended area of said vibrating structure, said distributed elastic element comprising a plurality of tubular components;
• a mass positioned on said distributed elastic element which is spaced away from said vibrating structure by a thickness of said distributed elastic element.