Patent US3601228A successfully refreshed from Google Patents.
US3601228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resonant-beam/tuned damper
Assignee: University of Dayton
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Filing: 1968-05-22
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Granted: 1971-08-24
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Expires: 1988-05-22
Abstract
Abstract This invention relates to a method and means of reducing vibration damage to components or component parts exposed to and having a cylindrical response. Specifically, the invention determines the resonant period of vibration and utilizes a tuneddamping device for shifting the resonance peak of the supporting structure and reducing its amplitude. The tuned-damping device is of the beam type and can be extremely small relative to the component and may actually be integrated therein.
Inventors
- 👤 Ahid D Nashif
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:41
CPC Classifications
F; F16; F16F; F16F7/00; F16F7/10; F16F7/104; F16F7/108
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
84 words
Apparatus for reducing the vibration in a structure comprising: a flexible resonant beam of a size and weight relatively small to said structure, viscoelastic means for supporting said beam on said structure, said viScoelastic member bonded to said beam and said structure, said resonant beam and said viscoelastic means together tuned to the frequency of vibration of said structure, wherein said resonant beam and said viscoelastic means shifts the resonant peak of vibration of said structure and reduces the amplitude of said resonant peak.
Claim 2
Dependent Claim
84 words
Apparatus for reducing the vibration in a structure comprising: a flexible resonant beam of a size and weight relatively small to said structure, viscoelastic means for supporting said beam on said structure, said viScoelastic member bonded to said beam and said structure, said resonant beam and said viscoelastic means together tuned to the frequency of vibration of said structure, wherein said resonant beam and said viscoelastic means shifts the resonant peak of vibration of said structure and reduces the amplitude of said resonant peak.
Claim 3
Dependent Claim
93 words
Apparatus as set forth in claim 1 wherein said resonant beam damper system is defined by: where: omega D is the natural frequency of the resonant-beam/tuned damper (rad/sec.) xi is the eigenvalue appropriate to beam geometry Gamma (kl3)/(8 pi 2EI) is a stiffness parameter k is the real part of link stiffness (lb./in.) l is the length of the beam (in.) E is Young''s Modulus of the beam material (p.s.i.) I is the second moment of area of beam cross section (in.4) Mu is the mass per unit length of the beam (slugs/in.)
Claim 4
Dependent Claim
18 words
Apparatus as set forth in claim 2 wherein said viscoelastic means supports said beam at both ends thereof.
Claim 5
Dependent Claim
27 words
Apparatus as set forth in claim 2 wherein said beam is anchored at one end and wherein said viscoelastic means supports said beam at its other end.
Claim 6
Dependent Claim
18 words
Apparatus as set forth in claim 2 wherein said viscoelastic means supports said beam at one end thereof.
Claim 7
Dependent Claim
31 words
Apparatus as set forth in claim 1 further comprising means for forming a cavity in said structure, and means for fixedly positioning said beam and said viscoelastic member in said cavity.
Claim 8
Dependent Claim
23 words
Apparatus as set forth in claim 3 further comprising a thin structural member for enclosing said beam and viscoelastic member in said cavity.
Claim 9
Dependent Claim
24 words
Apparatus as set forth in claim 3 wherein said beam and viscoelastic member are encapsulated and said capsule is fixedly positioned in said cavity.
Claim 10
Dependent Claim
42 words
Apparatus as set forth in claim 3 for reducing the vibrational amplitudes of structures exhibiting multimodal responses further comprising at least one more resonant beam and viscoelastic support means, and means for positioning on said structure said resonant beam and viscoelastic means.
Claim 11
Dependent Claim
35 words
Apparatus as set forth in claim 7 wherein said resonant beams and viscoelastic means are tuned over a range of frequencies to thereby damp the vibration of said structure over a wide range of frequencies.
Claim 12
Dependent Claim
11 words
Apparatus as set forth in claim 3 wherein Parallel pi .
Claim 13
Dependent Claim
10 words
Apparatus as set forth in claim 4 wherein xi 3.93.
Claim 14
Dependent Claim
10 words
Apparatus as set forth in claim 5 wherein xi 3.93.
References Cited (Backward Citations)
US3078971A
Cited
US3419111A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |