Patent US5108802A successfully refreshed from Google Patents.
US5108802A
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US
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Internally damped thin-walled, composite longitudinal member having dedicated internal constraining layers
Assignee: Northrop Grumman Corp
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Filing: 1990-01-09
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Granted: 1992-04-28
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Expires: 2010-01-09
Abstract
Abstract An internally damped structure having a thin, segmented layer of high modulus composite material acting as a constraining layer and bonded on both sides to layers of viscoelastic damping layers acting as shear layers. The arrangement forms a triple layer sandwich which is embedded in the wall of the structure. A compliant filler is positioned between adjacent segments of the composite constraining layer. In an alternate embodiment two such sandwich arrangements are embedded in the wall of the structure.
Inventors
- 👤 Stanley S. Sattinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:29
CPC Classifications
B; B32; B32B; B32B27/00; F; F16; F16F; F16F9/00; F16F9/30; F16F9/306; B32B1/00; B32B3/00; B32B3/10; B32B3/18; B32B7/00; B32B7/02; B32B7/022; B64; B64G; B64G99/00; B32B2305/00; B32B2305/34; B32B2307/00; B32B2307/50; B32B2307/56; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/139
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
125 words
An internally damped thin-walled composite longitudinal member, said composite longitudinal member having at least one-wall comprising: at least one multi-segmented layer of high-modulus composite material operable to function as a constraining layer, said constraining layer having a first and a second face; at least two layers of viscoelastic damping polymer film operable to function as a shear layer, said viscoelastic damping polymer film positioned upon at least said first and said second faces of said constraining layer; at least two load bearing base layers, said load bearing base layers being positioned upon said layers of viscoelastic damping polymer film; and said multi-segmented layer of high-modulus composite material being separated by a compliant filler, said compliant filler being inserted between adjacent segments of said composite material.
Claim 2
Dependent Claim
125 words
An internally damped thin-walled composite longitudinal member, said composite longitudinal member having at least one-wall comprising: at least one multi-segmented layer of high-modulus composite material operable to function as a constraining layer, said constraining layer having a first and a second face; at least two layers of viscoelastic damping polymer film operable to function as a shear layer, said viscoelastic damping polymer film positioned upon at least said first and said second faces of said constraining layer; at least two load bearing base layers, said load bearing base layers being positioned upon said layers of viscoelastic damping polymer film; and said multi-segmented layer of high-modulus composite material being separated by a compliant filler, said compliant filler being inserted between adjacent segments of said composite material.
Claim 3
Dependent Claim
88 words
An internally damped, thin-walled, composite beam, comprising: at least two load bearing base layers, each of said load bearing base layers having a first and a second face, said first and said second faces being planar and parallel; at least two viscoelastic shear layers, said viscoelastic shear layers residing upon said second face of said load bearing base layers; at least one multi-segmented constraining layer, said constraining layer residing upon said viscoelastic shear layer; and said segments of said multi-segmented constraining layer being separated by a compliant filler.
Claim 4
Dependent Claim
88 words
An internally damped, thin-walled, composite beam, comprising: at least two load bearing base layers, each of said load bearing base layers having a first and a second face, said first and said second faces being planar and parallel; at least two viscoelastic shear layers, said viscoelastic shear layers residing upon said second face of said load bearing base layers; at least one multi-segmented constraining layer, said constraining layer residing upon said viscoelastic shear layer; and said segments of said multi-segmented constraining layer being separated by a compliant filler.
Claim 5
Dependent Claim
120 words
A means for providing high damping performance through the dissipation of vibrational energy by sustaining large shear deformation in low-modulus, high-loss shear layers in thin-walled composite structures, comprising; an internal multi-segmented constraining layer, said constraining layer having a first and a second side; at least two shear layers, said shear layers residing upon said first and said second sides of said constraining layer; at least two load bearing base layers, each of said load bearing base layers having a first and a second face, said first and said second faces being planar and parallel, said two load bearing base layers being positioned upon said shear layers; and said segments of said multi-segmented constraining layer being separated by a compliant filler.
Claim 6
Dependent Claim
120 words
A means for providing high damping performance through the dissipation of vibrational energy by sustaining large shear deformation in low-modulus, high-loss shear layers in thin-walled composite structures, comprising; an internal multi-segmented constraining layer, said constraining layer having a first and a second side; at least two shear layers, said shear layers residing upon said first and said second sides of said constraining layer; at least two load bearing base layers, each of said load bearing base layers having a first and a second face, said first and said second faces being planar and parallel, said two load bearing base layers being positioned upon said shear layers; and said segments of said multi-segmented constraining layer being separated by a compliant filler.
Claim 7
Dependent Claim
25 words
A means for providing high damping performance in fiber-reinforced, thin-walled composite structures, as in claim 3 wherein said constraining layer is a high-modulus composite material.
Claim 8
Dependent Claim
26 words
A means for providing high damping performance in fiber-reinforced, thin-walled composite structures, as in claim 3 wherein said shear layer is a viscoelastic damping polymer film.
Claim 9
Dependent Claim
21 words
An internally damped, thin-walled composite longitudinal member as in claim 1, wherein said longitudinal member further comprises an open cylindrical cross-section.
Claim 10
Dependent Claim
20 words
An internally damped, thin-walled composite longitudinal member as in claim wherein said longitudinal member further comprises a closed cylindrical cross-section.
Claim 11
Dependent Claim
18 words
An internally damped, thin-walled composite longitudinal member as in claim 1, wherein said constraining layer is segmented axially.
Claim 12
Dependent Claim
18 words
An internally damped, thin-walled composite longitudinal member as in claim 1, wherein said constraining layer is segmented circumferentially.
Claim 13
Dependent Claim
20 words
An internally damped, thin-walled composite longitudinal member as in claim 1, wherein said constraining layer is segmented axially and circumferentially.
Claim 14
Dependent Claim
43 words
An internally damped, thin-walled composite longitudinal member as in claim 1, wherein said viscoelastic damping polymer film positioned upon said first face of said constraining layer is different from said viscoelastic damping polymer film positioned upon said second face of said constraining layer.
Claim 15
Dependent Claim
138 words
An internally damped, thin-walled composite longitudinal member, said composite longitudinal member having at least one wall and a cylindrical cross-section, said internally damped, thin-walled composite longitudinal member, comprising: at least one multi-segmented layer of high-modulus composite material, said multi-segmented layer of high-modulus composite material being segmented axially, said composite material operable to function as a constraining layer, said constraining layer having a first and a second face; at least two layers of viscoelastic damping polymer film operable to function as a shear layer, said viscoelastic damping polymer film positioned upon at least said first and said second faces of said constraining layer; at least two load bearing base layers, said load bearing base layers being positioned upon said layers of visco-elastic damping polymer film; and said segments of said multi-segmented constraining layer being separated by a compliant filler.
Claim 16
Dependent Claim
138 words
An internally damped, thin-walled composite longitudinal member, said composite longitudinal member having at least one wall and a cylindrical cross-section, said internally damped, thin-walled composite longitudinal member, comprising: at least one multi-segmented layer of high-modulus composite material, said multi-segmented layer of high-modulus composite material being segmented axially, said composite material operable to function as a constraining layer, said constraining layer having a first and a second face; at least two layers of viscoelastic damping polymer film operable to function as a shear layer, said viscoelastic damping polymer film positioned upon at least said first and said second faces of said constraining layer; at least two load bearing base layers, said load bearing base layers being positioned upon said layers of visco-elastic damping polymer film; and said segments of said multi-segmented constraining layer being separated by a compliant filler.
Claim 17
Dependent Claim
138 words
An internally damped, thin-walled composite longitudinal member, said composite longitudinal member having at least one wall and a cylindrical cross-section, said internally damped, thin-walled composite longitudinal member, comprising: at least one multi-segmented layer of high-modulus composite material, said multi-segmented layer of high-modulus composite material being segmented circumferentially, said composite material operable to function as a constraining layer, said constraining layer having a first and a second face; at least two layers of viscoelastic damping polymer film operable to function as a shear layer, said viscoelastic damping polymer film positioned upon at least, said first and said second faces of said constraining layer; at least two load bearing base layers, said load bearing base layers being positioned upon said layers of visco-elastic damping polymer film; and said segments of said multi-segmented constraining layer being separated by a compliant filler.
Claim 18
Dependent Claim
138 words
An internally damped, thin-walled composite longitudinal member, said composite longitudinal member having at least one wall and a cylindrical cross-section, said internally damped, thin-walled composite longitudinal member, comprising: at least one multi-segmented layer of high-modulus composite material, said multi-segmented layer of high-modulus composite material being segmented circumferentially, said composite material operable to function as a constraining layer, said constraining layer having a first and a second face; at least two layers of viscoelastic damping polymer film operable to function as a shear layer, said viscoelastic damping polymer film positioned upon at least, said first and said second faces of said constraining layer; at least two load bearing base layers, said load bearing base layers being positioned upon said layers of visco-elastic damping polymer film; and said segments of said multi-segmented constraining layer being separated by a compliant filler.
Claim 19
Dependent Claim
140 words
An internally damped, thin-walled composite longitudinal member, said composite longitudinal member having at least one wall, and a cylindrical cross-section, said internally damped, thin-walled composite longitudinal member, comprising: at least one multi-segmented layer of high-modulus composite material, said multi-segmented layer of high-modulus composite material being segmented axially and circumferentially, said composite material operable to function as a constraining layer, said constraining layer having a first and a second face; at least two layers of viscoelastic damping polymer film operable to function as a shear layer, said viscoelastic damping polymer film positioned upon at least said first and said second faces of said constraining layer; at least two load bearing base layers, said load bearing base layers being positioned upon said layers of visco-elastic damping polymer film; and said segments of said multi-segmented constraining layer being separated by a compliant filler.
Claim 20
Dependent Claim
140 words
An internally damped, thin-walled composite longitudinal member, said composite longitudinal member having at least one wall, and a cylindrical cross-section, said internally damped, thin-walled composite longitudinal member, comprising: at least one multi-segmented layer of high-modulus composite material, said multi-segmented layer of high-modulus composite material being segmented axially and circumferentially, said composite material operable to function as a constraining layer, said constraining layer having a first and a second face; at least two layers of viscoelastic damping polymer film operable to function as a shear layer, said viscoelastic damping polymer film positioned upon at least said first and said second faces of said constraining layer; at least two load bearing base layers, said load bearing base layers being positioned upon said layers of visco-elastic damping polymer film; and said segments of said multi-segmented constraining layer being separated by a compliant filler.
References Cited (Backward Citations)
US4954375A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-04-28 | 1995-10-28 | 1996-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-28 | 1999-10-28 | 2000-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-28 | 2003-10-28 | 2004-04-28 | $7700.00 | Window Closed / Lapsed |