Patent US4097193A successfully refreshed from Google Patents.
US4097193A
Expired / Lapsed
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Elastomeric damping arrangement
Assignee: Airbus Helicopters Deutschland GmbH
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Filing: 1976-12-17
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Granted: 1978-06-27
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Expires: 1996-12-17
Abstract
Abstract An elastomeric damping arrangement is constructed to provide a highly efficient damping of the vibrations of a vibration prone member, such as an airfoil, especially a helicopter rotor blade. The damping arrangement is applied directly on or to the vibration prone structural member in the region of dynamic deformation, as an integral component part of the structural member. At least one damping layer is covered by a protecting layer which merges smoothly into the surface of the vibration prone member. The damping layer is made of a viscoelastic material having a high internal damping action. The protecting or cover layer is made of high strength material having a high rigidity in the direction of the occurring damping force.
Inventors
- 👤 Klaus Brunsch
- 👤 Emil Weiland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:28
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/46; B64C27/001; B64C27/51; F; F16; F16F; F16F9/00; F16F9/30; F16F9/306; Y; Y10; Y10S; Y10S416/00; Y10S416/50
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
133 words
An elastomeric damping arrangement providing a damping force for a structural member having a given surface contour and being capable of vibrating in response to dynamic deformations, especially for an airfoil, comprising damping layer means, cover layer means, and means operatively interconnecting said layer means to each other in a surface contact fashion, to form an integral structure arranged in intimate contact with the structural member solely in regions thereof subject to said dynamic deformations and to said vibrations, said integral structure merging smoothly into said surface contour of said structural member in said dynamic deformation regions, said cover layer means being made of a high strength material having a high unidirectional rigidity which is effective in the direction of said damping force, said damping layer means being made of a viscoelastic material.
Claim 2
Dependent Claim
133 words
An elastomeric damping arrangement providing a damping force for a structural member having a given surface contour and being capable of vibrating in response to dynamic deformations, especially for an airfoil, comprising damping layer means, cover layer means, and means operatively interconnecting said layer means to each other in a surface contact fashion, to form an integral structure arranged in intimate contact with the structural member solely in regions thereof subject to said dynamic deformations and to said vibrations, said integral structure merging smoothly into said surface contour of said structural member in said dynamic deformation regions, said cover layer means being made of a high strength material having a high unidirectional rigidity which is effective in the direction of said damping force, said damping layer means being made of a viscoelastic material.
Claim 3
Dependent Claim
19 words
The elastomeric damping arrangement of claim 1, wherein said cover layer means is made of a fiber composite material.
Claim 4
Dependent Claim
17 words
The elastomeric damping arrangement of claim 2, wherein said fiber composite material is a carbon fiber material.
Claim 5
Dependent Claim
26 words
The elastomeric damping arrangement of claim 1, further comprising adhesive bonding means which secure the damping layer means directly to the surface of said structural member.
Claim 6
Dependent Claim
16 words
The elastomeric damping arrangement according to claim 1, wherein said damping layer is made of polyurethane.
Claim 7
Dependent Claim
30 words
The elastomeric damping arrangement according to claim 1, further comprising means securing one end of said cover layer means to said structural member in a manner rigid against relative displacement.
Claim 8
Dependent Claim
29 words
The elastomeric damping arrangement according to claim 1, wherein said cover layer means comprise grooves extending perpendicularly to the plane in which the vibrations of the structural member occur.
Claim 9
Dependent Claim
51 words
The elastomeric damping arrangement according to claim 1, further comprising recess means in said structural member, said recess means being located in regions where said dynamic deformations occur in said structural member, said integral structure including said cover layer means and said damping layer means being located in said recess means.
Claim 10
Dependent Claim
51 words
The elastomeric damping arrangement according to claim 1, wherein said damping layer means and said cover layer means each comprise a plurality of layers, said arrangement further comprising means securing opposite ends of adjacent ones of said cover layer means to said structural member in a manner rigid against relative displacement.
Claim 11
Dependent Claim
33 words
The elastomeric damping arrangement according to claim 1, wherein said integral structures are secured to a hingeless helicopter blade in the area of the blade rear edge at the blade root or stem.
Claim 12
Dependent Claim
21 words
The elastomeric damping arrangement according to claim 1, wherein said integral structures are secured to the suction side of a blade.
Claim 13
Dependent Claim
21 words
The elastomeric damping arrangement according to claim 1, wherein said integral structures are secured to the pressure side of a blade.
Claim 14
Dependent Claim
38 words
The elastomeric damping arrangement according to claim 1, wherein said integral structures are secured in positions which are spaced a distance from the secured end of an airfoil corresponding to about 0.7 times the length of said airfoil.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |