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US 9,521,753 B1Granted
Vibration damping circuit card assembly
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorRonald Allen Hunt
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Abstract
A vibration damping circuit card assembly includes a populated circuit card having a mass M. A closed metal container is coupled to a surface of the populated circuit card at approximately a geometric center of the populated circuit card. Tungsten balls fill approximately 90% of the metal container with a collective mass of the tungsten balls being approximately (0.07) M.
Claims7
A vibration damping circuit card assembly, comprising:
- a populated circuit card having a mass M;
- a closed metal container coupled to a surface of said populated circuit card at a region of said populated circuit card that includes a geometric center of said populated circuit card, said closed metal container including
- a base having a planar surface bonded to said surface of said populated circuit card, said base having a continuous ridge extending away therefrom wherein an annular flange is defined adjacent said continuous ridge,
- a housing having an open end that is in sliding engagement with said continuous ridge, said housing having a continuous flange defined about said open end for engagement with said annular flange, and
- an adhesive disposed between said open end of said housing and said continuous ridge, said adhesive also disposed between said continuous flange and said annular flange;
- and
- tungsten balls filling approximately 90% of said metal container, wherein a mass of said tungsten balls is approximately (0.07)M.
4 more elements
A vibration damping circuit card assembly, comprising:
- a populated circuit card having a mass M, said populated circuit card having a geometric center and defining a plurality of support locations distributed about said geometric center;
- a closed metal cylinder coupled to a surface of said populated circuit card at a region of said populated circuit card that includes said geometric center thereof, said closed metal cylinder including
- a base having a planar surface bonded to said surface of said populated circuit card, said base having a circular ridge extending away therefrom wherein an annular flange is defined adjacent said circular ridge,
- a cylindrical housing having a closed end and having an open end that is in sliding engagement with said circular ridge, said cylindrical housing having a continuous flange defined about said open end for engagement with said annular flange, and
- an adhesive disposed between said open end of said cylindrical housing and said circular ridge, said adhesive also disposed between said continuous flange and said annular flange;
- and
- solid tungsten balls filling approximately 90% of said metal container, wherein a collective mass of said solid tungsten balls is approximately (0.07)M.
4 more elements
Dependencies are inferred from the claim text.