Patterned noise damping composite
AssigneePre Finish Metals Incorporated
InventorsRichard M. Hansen, Scott R. Dobrusky, Edward J. Vydra
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Abstract
A noise damping composite includes a viscoelastic layer disposed between a pair of constraining metal layers, the viscoelastic layer including a pattern of adjacent stripes of different viscoelastic materials. Stripes of two or three different materials are disclosed. The viscoelastic layer can be applied in either liquid or solid form. In the former, it may be provided with mica platelets distributed throughout the layer.
Claims16
A vibration damping composite adapted for damping noise-producing vibrations in a medium having a plurality of vibrational modes each having a different natural oscillation frequency, said composite comprising:
- a substrate, and a single viscoelastic damping layer disposed on said substrate, said layer including a pattern of laterally adjacent areas of different viscoelastic materials, said pattern including three laterally adjacent stripes respectively formed of different viscoelastic materials, each of said stripes having a width greater than one-fourth the wavelength of the vibrations in the medium in the lowest-frequency vibrational mode.
A vibration damping composite adapted for damping noise-producing vibrations in a medium having a plurality of vibrational modes each having a different natural oscillation frequency, said composite comprising:
- a pair of constraining layers, and a single viscoelastic damping layer disposed between said constraining layers, said damping layer including a pattern of laterally adjacent areas of different viscoelastic materials, said pattern including three laterally adjacent stripes respectively formed of different viscoelastic materials, each of said stripes having a width greater than one-fourth the wavelength of the vibrations in the medium in the lowest-frequency vibrational mode.
A method of forming a vibration damping composite comprising the steps of:
- providing a substrate, and applying to the substrate only a single viscoelastic damping layer in liquid form including a pattern of contiguous side-by-side areas, each area having opposite side edges and being contiguous with adjacent areas only along said side edges, with the viscoelastic material of each area being different from the viscoelastic material of any area contiguous therewith.
Dependencies are inferred from the claim text.