US3820626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and device for attenuating the noise produced by a jet engine nozzle
Assignee: Safran Aircraft Engines SAS
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Filing: 1972-09-22
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Granted: 1974-06-28
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Expires: 1992-09-22
Abstract
Abstract A method and device for attenuating the noise emitted by a jet engine nozzle for supersonic aircraft, the method consisting in pinching the jet issuing from the nozzle to spread the jet in a plane, and the device comprising a pair of oppositely disposed retractable panels or the like mounted within the nozzle and movable between a retracted inoperative position and an operative position in which they are effective to pinch the jet and thus spread it out in a plane so that a silencing effect is achieved in said plane.
Inventors
- 👤 H Bonneaud
- 👤 R Hoch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:08
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/28; F02K1/34; F02K1/40; F02K1/42; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
94 words
A method of attenuating in selective radial directions the noise of a jet issuing from a jet aircraft propulsion nozzle according to whether the aircraft is proximate to the ground or in a flyover phase, comprising the steps of selectively squeezing said jet to throttlingly confine it from top and bottom to spread it out horizontally when said aircraft is proximate to the ground, and from both sides to spread it out vertically when said aircraft is in flyover phase, said jet being otherwise left unsqueezed when said aircraft is at normal altitude flight.
Claim 2
Independent Claim
94 words
A method of attenuating in selective radial directions the noise of a jet issuing from a jet aircraft propulsion nozzle according to whether the aircraft is proximate to the ground or in a flyover phase, comprising the steps of selectively squeezing said jet to throttlingly confine it from top and bottom to spread it out horizontally when said aircraft is proximate to the ground, and from both sides to spread it out vertically when said aircraft is in flyover phase, said jet being otherwise left unsqueezed when said aircraft is at normal altitude flight.
Claim 3
Dependent Claim
160 words
In an aircraft propelled by a jet issuing from a nozzle and operable (i) in a condition proximite to the ground, (ii) in flyover condition and (iii) at normal altitude flight condition, a controllable device for attenuating in selective radial directions the noise produced by said jet according to the condition of said aircraft, said device comprising: a first pair of controllable means positioned adjacent the top and bottom respectively of said nozzle and actuatable in a generally vertical plane to throttlingly confine said jet from top and bottom whereby said jet spreads out in a generally horizontal plane, a second pair of controllable means positioned orthogonally with respect to Said first pair, adjacent the respective sides of said nozzle and actuatable in said generally horizontal plane to throttlingly confine said jet laterally whereby said jet spreads out in said generally vertical plane, and means for selectively and independently actuating each of said first and second pairs of controllable means.
Claim 4
Dependent Claim
160 words
In an aircraft propelled by a jet issuing from a nozzle and operable (i) in a condition proximite to the ground, (ii) in flyover condition and (iii) at normal altitude flight condition, a controllable device for attenuating in selective radial directions the noise produced by said jet according to the condition of said aircraft, said device comprising: a first pair of controllable means positioned adjacent the top and bottom respectively of said nozzle and actuatable in a generally vertical plane to throttlingly confine said jet from top and bottom whereby said jet spreads out in a generally horizontal plane, a second pair of controllable means positioned orthogonally with respect to Said first pair, adjacent the respective sides of said nozzle and actuatable in said generally horizontal plane to throttlingly confine said jet laterally whereby said jet spreads out in said generally vertical plane, and means for selectively and independently actuating each of said first and second pairs of controllable means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |