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1. WO1996003585 - ACTIVE CONTROL OF TONE NOISE IN ENGINE DUCTS

Publication Number WO/1996/003585
Publication Date 08.02.1996
International Application No. PCT/US1995/009999
International Filing Date 24.07.1995
Chapter 2 Demand Filed 15.02.1996
IPC
F04D 29/66 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
04POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
DNON-POSITIVE-DISPLACEMENT PUMPS
29Details, component parts, or accessories
66Combating cavitation, whirls, noise, vibration, or the like; Balancing
CPC
F02C 7/042
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
CGAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
7Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
04Air intakes for gas-turbine plants or jet-propulsion plants
042having variable geometry
F02C 7/045
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
CGAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
7Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
04Air intakes for gas-turbine plants or jet-propulsion plants
045having provisions for noise suppression
F04D 29/663
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
DNON-POSITIVE-DISPLACEMENT PUMPS
29Details, component parts, or accessories
66Combating cavitation, whirls, noise, vibration or the like
661especially adapted for elastic fluid pumps
663Sound attenuation
F04D 29/681
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
DNON-POSITIVE-DISPLACEMENT PUMPS
29Details, component parts, or accessories
66Combating cavitation, whirls, noise, vibration or the like
68by influencing boundary layers
681especially adapted for elastic fluid pumps
F05D 2220/36
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
2220Application
30in turbines
36specially adapted for the fan of turbofan engines
F05D 2260/96
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
2260Function
96Preventing, counteracting or reducing vibration or noise
Applicants
  • THE BOEING COMPANY [US/US]; P.O. Box 3707 M.S. 13-08 Seattle, WA 98124-2207, US
Inventors
  • ANDERSSON, Anders, O.; US
Agents
  • GARDNER, Conrad, O.; The Boeing Company P.O. Box 3707, M.S. 13-08 Seattle, WA 98124-2207, US
Priority Data
08/282,39128.07.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) ACTIVE CONTROL OF TONE NOISE IN ENGINE DUCTS
(FR) CONTROLE ACTIF DU BRUIT SONORE DANS DES CONDUITS D'UN MOTEUR
Abstract
(EN)
The application of active noise control to influence the fan-noise components in engine ducts. The fan (25) is used as a source of counter noise by introducing flow distortions upstream of the fan. Microphone arrays sense the noise and produce a control output signal for controlling a distortion producer. The control output signal for the distortion producer comes from a control algorithm utilizing the output of the microphone signals sampled at a defined rate based on the fan blade passing frequency.
(FR)
L'invention concerne l'application d'un contrôle de bruit actif pour influencer les composantes du bruit d'un ventilateur dans les conduits d'un moteur. Le ventilateur (25) est utilisé comme source de contre-bruit en introduisant des déformations d'écoulement en amont du ventilateur. Des ensembles de microphones captent le bruit et produisent un signal de sortie de contrôle pour contrôler un dispositif de production de déformations. Le signal de sortie de contrôle pour ce dernier dispositif provient d'un algorithme de contrôle utilisant la sortie des signaux de microphone échantillonnés à une vitesse définie en fonction de la fréquence de passage de l'ailette du ventilateur.
Also published as
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