Active/passive distributed absorber for vibration and sound radiation control
First Claim
1. A vibration absorber for controlling vibration and sound radiation over an extended area of a vibrating structure, comprising:
- distributed elastic elements positioned along an area of the vibrating structure;
a matrix of at least two masses, wherein each mass of said at least two masses is associated with a distributed elastic element, and wherein each mass of the at least two masses is spaced away from said vibrating structure,wherein at least one of said distributed elastic elements has a waved shape along at least one dimension.
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Accused Products
Abstract
The active/passive absorber for extended vibration and sound radiation control includes principally two layers. The first layer has a low stiffness per unit area which allows motion in the direction perpendicular to its main plane. The second layer is principally a mass layer. These two combined layers have a frequency of resonance close to one of the main structure. The dynamic behavior of the coupled system makes the active/passive absorber a passive absorber; however, the first layer can be electrically actuated to induce motion in the direction perpendicular to its main plane. This addition property induces and/or changes the motion of the mass layer and therefore improves the dynamic properties of the active/passive absorber system. The active/passive absorber can have multiple mass layers and multiple elastic layers stacked one on top of the other. In addition, the mass layers can be continuous or discretized, and have varying thicknesses and shapes for sections and/or segments in the mass layer.
27 Citations
27 Claims
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1. A vibration absorber for controlling vibration and sound radiation over an extended area of a vibrating structure, comprising:
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distributed elastic elements positioned along an area of the vibrating structure; a matrix of at least two masses, wherein each mass of said at least two masses is associated with a distributed elastic element, and wherein each mass of the at least two masses is spaced away from said vibrating structure, wherein at least one of said distributed elastic elements has a waved shape along at least one dimension. - View Dependent Claims (2, 9, 10, 12, 22, 23)
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3. A vibration absorber for controlling vibration and sound radiation over an extended area of a vibrating structure, comprising:
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a distributed elastic element positioned along an area of the vibrating structure; at least two discrete mass sections; and an elastic material, wherein said distributed elastic element is embedded within said elastic material, and wherein at least one mass section of said at least two discrete mass sections is positioned on a surface of said elastic material and another mass section of said at least two discrete mass sections embedded within said elastic material, and wherein each of said two discrete mass sections is spaced away from said vibrating structure. - View Dependent Claims (4, 5, 6, 7, 8, 11)
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13. A vibration absorber for controlling vibration and sound radiation over an extended area of a vibrating structure, comprising:
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a distributed elastic element positioned along an area of the vibrating structure; and a mass positioned on said distributed elastic element and spaced away from said vibrating structure, wherein said mass is perforated. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 24, 25, 26, 27)
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Specification