# US 9,521,753 B1 · Vibration damping circuit card assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,521,753 B1 - Document ID: US9521753B1 - Status: Granted - Kind: B1 - Application number: 14/196,203 - Filed: 2014-03-04 - Granted: 2016-12-13 - Earliest claimed: 2014-03-04 - Assignees: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration - Applicants: The United States of America as Represented by the Administrator of the National Aeronautics and Space Administration - Inventors: Ronald Allen Hunt - Web page: https://patentgrep.com/patent/US9521753B1 ## CPC - F16F 7/015: {the particles being spherical, cylindrical or the like} - H02G 3/08: Distribution boxes; Connection or junction boxes - B65B 5/08: Packaging groups of articles, the articles being individually gripped or guided for transfer to the containers or receptacles - G06F 15/161: {Computing infrastructure, e.g. computer clusters, blade chassis or hardware partitioning (casings, cabinets, racks or drawers for data centers H05K5/00)} - H05K 1/02: Details - H05K 1/0271: {Arrangements for reducing stress or warp in rigid printed circuit boards, e.g. caused by loads, vibrations or differences in thermal expansion} - H05K 5/0043: {comprising a frame housing mating with two lids wherein the PCB is flat mounted on the frame housing} - H05K 5/006: {characterized by features for holding the PCB within the housing} - H05K 7/1488: {Cabinets therefor, e.g. chassis or racks or mechanical interfaces between blades and support structures} - H05K 1/181: associated with surface mounted components - H05K 2201/2045: Protection against vibrations - F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION - H02G: INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES - B65B: MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING (bundling and pressing devices for cigars A24C1/44; devices for tensioning and securing binders adapted to be supported by the article or articles to be bound B25B25/00; applying closure members to bottles, jars or similar containers B67B1/00-B67B6/00; concurrent cleaning, filling and closing of bottles B67C7/00; emptying bottles, jars, cans, casks, barrels or similar containers B67C9/00) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## 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. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) A vibration damping circuit card assembly as in claim 1, wherein said closed metal container is made from a metal selected from the group consisting of aluminum and steel. ### Claim 3 (depends on 1) A vibration damping circuit card assembly as in claim 1, wherein said closed metal container is cylindrical. ### Claim 4 (depends on 1) A vibration damping circuit card assembly as in claim 1, further comprising a continuous fillet of adhesive disposed on said continuous flange and a portion of said populated circuit card disposed about said continuous flange. ### Claim 5 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. ### Claim 6 (depends on 5) A vibration damping circuit card assembly as in claim 5, wherein said closed metal cylinder is made from a metal selected from the group consisting of aluminum and steel. ### Claim 7 (depends on 5) A vibration damping circuit card assembly as in claim 5, further comprising a continuous fillet of adhesive disposed on said continuous flange and a portion of said populated circuit card disposed about said continuous flange.