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Patent US5838092A successfully refreshed from Google Patents.
US5838092A
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Apparatus and method for vibration control using active constrained layer edge elements
Assignee: Penn State Research Foundation
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Filing: 1996-08-29
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Granted: 1998-11-17
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Expires: 2016-08-29
Abstract
Abstract An active constrained layer system includes a passive viscoelastic damping material positioned on top of a substrate. An active piezoelectric layer is positioned on top of the passive viscoelastic damping material. An edge element physically connects the active piezoelectric layer to the substrate to transmit active forces and moments from the piezoelectric layer to the substrate. The novel edge element yields higher active control from the piezoelectric layer, while preserving the damping capacity of the passive viscoelastic layer. The edge element may be implemented in a variety of ways, including an edge element clamp structure and an edge element post structure.
Inventors
- 👤 Kon-Well Wang
- 👤 Wei-Hsin Liao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:50
CPC Classifications
F; F16; F16F; F16F15/00; F16F15/005
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
61 words
An apparatus for reducing vibrations of a substrate, comprising: a passive viscoelastic damping material positioned on top of said substrate; an active piezoelectric layer positioned on top of said passive viscoelastic damping material; and a set of edge elements physically connecting said active piezoelectric layer to said substrate to transmit active forces and moments from said piezoelectric layer to said substrate.
Claim 2
Independent Claim
61 words
An apparatus for reducing vibrations of a substrate, comprising: a passive viscoelastic damping material positioned on top of said substrate; an active piezoelectric layer positioned on top of said passive viscoelastic damping material; and a set of edge elements physically connecting said active piezoelectric layer to said substrate to transmit active forces and moments from said piezoelectric layer to said substrate.
Claim 3
Dependent Claim
21 words
The apparatus of claim 1 wherein an edge element of said set of edge elements is an edge element clamp structure.
Claim 4
Dependent Claim
21 words
The apparatus of claim 1 wherein an edge element of said set of edge elements is an edge element post structure.
Claim 5
Dependent Claim
25 words
The apparatus of claim 1 further comprising a sensor positioned on said substrate to generate a sense signal in response to vibrations of said substrate.
Claim 6
Dependent Claim
24 words
The apparatus of claim 4 further comprising a controller connected to said sensor to generate a control signal in response to said sense signal.
Claim 7
Dependent Claim
32 words
The apparatus of claim 5 further comprising an energy source connected to said controller to generate an energy signal for application to said active piezoelectric layer in response to said control signal.
Claim 8
Independent Claim
60 words
A method of reducing vibrations within a substrate, comprising: positioning a passive viscoelastic damping material on top of said substrate; placing an active piezoelectric layer on top of said passive viscoelastic damping material; and transmitting active forces and moments from said piezoelectric layer to said substrate with set of edge elements physically connecting said active piezoelectric layer and said substrate.
Claim 9
Independent Claim
60 words
A method of reducing vibrations within a substrate, comprising: positioning a passive viscoelastic damping material on top of said substrate; placing an active piezoelectric layer on top of said passive viscoelastic damping material; and transmitting active forces and moments from said piezoelectric layer to said substrate with set of edge elements physically connecting said active piezoelectric layer and said substrate.
Claim 10
Dependent Claim
30 words
The method of claim 7 wherein said transmitting step includes the step of transmitting active forces and moments from said piezoelectric layer to said substrate with edge element clamp structures.
Claim 11
Dependent Claim
30 words
The method of claim 7 wherein said transmitting step includes the step of transmitting active forces and moments from said piezoelectric layer to said substrate with edge element post structures.
Claim 12
Dependent Claim
21 words
The method of claim 7 further comprising the step of generating a sense signal in response to vibrations of said substrate.
Claim 13
Dependent Claim
20 words
The method of claim 10 further comprising the step of producing a control signal in response to said sense signal.
Claim 14
Dependent Claim
25 words
The method of claim 11 further comprising the step of applying an energy signal to said active piezoelectric layer in response to said control signal.
References Cited (Backward Citations)
US3728562A
Cited
US4148183A
Cited
JPS5513581A
Cited
US4626730A
Cited
US5315203A
Cited
US5485053A
Cited
US5519278A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-11-16 | 2002-05-18 | 2002-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-11-16 | 2006-05-18 | 2006-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-11-16 | 2010-05-18 | 2010-11-17 | $7700.00 | Window Closed / Lapsed |