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1. WO1991001034 - AN ACOUSTIC LINER

Publication Number WO/1991/001034
Publication Date 24.01.1991
International Application No. PCT/US1990/003538
International Filing Date 21.06.1990
IPC
B64C 1/40 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
64AIRCRAFT; AVIATION; COSMONAUTICS
CAEROPLANES; HELICOPTERS
1Fuselages; Constructional features common to fuselages, wings, stabilising surfaces, or the like
40Sound or heat insulation
F02K 1/82 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
KJET-PROPULSION PLANTS
1Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
78Other construction of jet pipes
82Jet pipe walls, e.g. liners
G10K 11/172 2006.01
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES;  METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
172using resonance effects
CPC
B64D 2033/0206
BPERFORMING OPERATIONS; TRANSPORTING
64AIRCRAFT; AVIATION; COSMONAUTICS
DEQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLYING SUITS; PARACHUTES; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
33Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for
02of combustion air intakes
0206comprising noise reduction means, e.g. acoustic liners
B64D 2033/0286
BPERFORMING OPERATIONS; TRANSPORTING
64AIRCRAFT; AVIATION; COSMONAUTICS
DEQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLYING SUITS; PARACHUTES; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
33Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for
02of combustion air intakes
0266specially adapted for particular type of power plants
0286for turbofan engines
F02K 1/827
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
KJET-PROPULSION PLANTS
1Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
78Other construction of jet pipes
82Jet pipe walls, e.g. liners
827Sound absorbing structures or liners
G10K 11/172
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
172using resonance effects
Y02T 50/672
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
50Aeronautics or air transport
60Efficient propulsion technologies
67Relevant aircraft propulsion technologies
671Measures to reduce the propulsor weight
672using composites
Applicants
  • GRUMMAN AEROSPACE CORPORATION [US/US]; Bethpage, NY 11714, US
Inventors
  • ARCAS, Noe; US
  • PARENTE, Charles, A.; US
Agents
  • SCOTT, Anthony, C.; Scully, Scott, Murphy & Presser 400 Garden City Plaza Garden City, NY 11530, US
Priority Data
371,39826.06.1989US
371,39926.06.1989US
371,59326.06.1989US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) AN ACOUSTIC LINER
(FR) GARNITURE D'INSONORISATION
Abstract
(EN)
An acoustic liner comprising a sound permeable inside plate forming a first closed annulus, and a sound impermeable outside plate forming a second closed annulus located outside of and extending around the first closed annulus. The inside and outside plates are spaced apart and thus form an annular chamber therebetween; and a core member is secured in this annular chamber, between the inside and outside plates. The core member forms or has the shape of a sine wave form annularly extending around the inside plate, and the core member and the inside plate form a multitude of varying depth sound absorption chambers to attenuate sound waves over a broad band of frequencies.
(FR)
Garniture d'insonorisation comprenant une plaque intérieure perméable aux sons formant ainsi un premier espace annulaire fermé, et une plaque extérieure perméable aux sons formant un deuxième espace annulaire fermé, situé à l'extérieur et s'étendant autour du premier espace annulaire fermé. Les plaques intérieure et extérieure sont espacées et forment ainsi une chambre annulaire entre les deux. Une âme est fixée dans cette chambre annulaire, entre les plaques intérieure et extérieure. L'âme forme ou bien a une forme d'onde sinusoïdale s'étendant d'une façon annulaire autour de la plaque intérieure, et l'âme ainsi que la plaque intérieure forment une multitude de chambres d'insonorisation de profondeur variable, pour atténuer les ondes sonores dans une large bande de fréquences.
Also published as
Latest bibliographic data on file with the International Bureau