公开(公告)号：EP1348908A3

公开(公告)日：2005-04-13

申请号：EP03100212.4

申请日：2003-02-03

申请人： ALSTOM Technology Ltd

发明人： Gutmark, Ephraim ,  Paschereit, Christian Oliver

IPC分类号： F23M13/00 ,  F23R3/00 ,  F23N5/16 ,  F23N5/24

CPC分类号： F23R3/00 ,  F02C9/26 ,  F05D2260/962 ,  F23K2900/05003 ,  F23M20/005 ,  F23N5/16 ,  F23N5/24 ,  F23R2900/00013 ,  F23R2900/00014

摘要： Bei einem Verfahren zur Kontrolle von thermoakustischen Instabilitäten bzw. Schwingungen in einem Verbrennungssystem (15) werden mit den thermoakustischen Instabilitäten verknüpfte Druckschwingungen und/oder Wärmefreisetzungsschwingungen im Verbrennungssystem (15) gemessen, das resultierende Messsignal gefiltert, zeitlich verzögert und verstärkt, und nach Massgabe des gefilterten, verzögerten und verstärkten Messsignals der Brennstoffstrom zum oder die Verbrennungsluft für das Verbrennungssystem (15) moduliert. Bei einem solchen Verfahren wird der Einsatz kostengünstigerer Modulationseinrichtungen dadurch erreicht, dass die Modulation bei einer Subharmonischen einer dominanten Instabilitätsfrequenz im Verbrennungssystem (15) erfolgt.

公开(公告)号：EP1517022A2

公开(公告)日：2005-03-23

申请号：EP04255758.7

申请日：2004-09-22

申请人： GENERAL ELECTRIC COMPANY

发明人： Mani, Ramani ,  Graziosi, Paolo

IPC分类号： F02C7/045

CPC分类号： F02K3/06 ,  B64D33/02 ,  B64D2033/0206 ,  B64D2033/0286 ,  F02C7/045 ,  F05D2250/51 ,  F05D2260/962

摘要： In an aspect, a method is provided for attenuating jet engine noise. Air velocity, adjacent to an inlet fan duct outer wall (22), is increased to a greater rate than typical velocity of an operational engine ambient inlet airflow (12), adjacent to the inlet fan duct outer wall. Boundary layer (50) and associated turbulence is reduced or eliminated. Refraction and absorption of inlet sound into an acoustic liner (44) is optimized. In an aspect, air velocity is increased by injecting air. In an aspect, air velocity is increased by exerting a suction force. In an aspect, a system is provided to attenuate jet engine noise. In an aspect, a fluid duct (80) is provided opening to an inlet fan duct outer wall (22) and to aft of a fan rotor (42).

摘要翻译： 在一方面，提供了一种用于衰减喷气发动机噪声的方法。 与入口风扇管道外壁（22）相邻的空气速度增加到比与入口风扇管道外壁相邻的操作的发动机环境入口气流（12）的典型速度更大的速率。 边界层（50）和相关的湍流减少或消除。 入口声音进入声学衬垫（44）的折射和吸收被优化。 在一方面，通过喷射空气来增加空气速度。 在一方面，通过施加吸力来增加空气速度。 在一方面，提供了一种用于衰减喷气发动机噪声的系统。 在一个方面，流体通道（80）设置成通向入口风扇管道外壁（22）和风扇转子（42）的后部。

公开(公告)号：EP1340736A1

公开(公告)日：2003-09-03

申请号：EP01998517.5

申请日：2001-11-28

申请人： Ishikawajima-Harima Heavy Industries Co., Ltd. ,  Ube Industries, Ltd.

发明人： OISHI, Tsutomu, Ishikawajima-Harima Heavy Ind. ,  NAKAMURA, Yoshiya, Ishikawajima-Harima Heavy Ind. ,  TANAKA, Yoshizumi, UBE Industries, LTD. ,  SATO, Mitsuhiko, UBE Industries, LTD.

IPC分类号： C04B38/04

CPC分类号： G10K11/172 ,  C03C11/007 ,  C04B38/04 ,  C04B2111/52 ,  F02K1/827 ,  F05D2260/962 ,  G10K11/162 ,  Y02T50/671 ,  C04B35/00

摘要： The porous sound-absorbing material manufactured is light and has excellent heat resistance to be applicable to the exhaust nozzle etc. of a jet engine, can effectively absorb noise as that from a jet engine, over a wide range of frequencies, is free from variations in porosity, and provides stable performance characteristics. An essential feature thereof is the formation of a skeleton of the material, with aggregates 5 containing voids 6.

摘要翻译： 所制造的多孔吸声材料是轻的并且具有优异的耐热性，适用于喷气发动机的排气喷嘴等，能够有效地吸收来自喷气发动机的噪音，在宽的频率范围内，没有变化 并具有稳定的性能特点。 其主要特征是形成材料的骨架，其中聚集体5含有空隙6.

公开(公告)号：EP1322844A2

公开(公告)日：2003-07-02

申请号：EP01997991.3

申请日：2001-10-02

申请人： Rohr, Inc.

发明人： BYRNE, Stuart, James ,  MOE, Jeffrey, W.

IPC分类号： F01N7/18

CPC分类号： F02K3/06 ,  F02C7/045 ,  F05D2220/36 ,  F05D2260/96 ,  F05D2260/962 ,  F05D2260/963 ,  G10K11/175

摘要： An assembly useful in reducing aircraft engine noise such as turbofan engine noise (730) comprises: (i) at least one tube 'H-Q' having an inlet end (738), an outlet end (740) and a central tube portion therebetween; and (ii) at least one actuator operatively interconnected to at least one tube, wherein the actuator is capable of causing dynamic response by the tube. The assembly of this invention may be used in a method for reducing noise, the method comprising: (a) providing means for generating non-uniform noise energy about an inner surface and within a disclosure having at least an inlet; (b) providing an assembly for reducing noise comprising; (i) at least one having an inlet end, an outlet end and a central tube portion therebetween, and (ii) at least one actuator operatively interconnected to at least one tube, wherein the actuator is capable of causing dynamic response by the tube; and (c) directing at least a portion of the non-uniform noise into the assembly.

公开(公告)号：EP1313937A1

公开(公告)日：2003-05-28

申请号：EP01955947.5

申请日：2001-07-24

申请人： THE BOEING COMPANY

发明人： KIBENS, Valdis ,  RAMAN, Ganesh

IPC分类号： F02K1/82

CPC分类号： F02K1/34 ,  F02K1/827 ,  F05D2260/96 ,  F05D2260/962 ,  F05D2260/99 ,  Y02T50/671

摘要： An active noise suppression apparatus and method for reducing jet engine noise and buffeting. A plurality of resonant cavities (12) are formed in a structural member disposed on or adjacent to a jet engine exhaust nozzle (22). Each resonant cavity opens toward an output slot. A compressed air chamber is used to supply a pressurized, supersonic jetstream airflow through the inlet port (16) into the interior area of the resonant cavity (12). This causes a high frequency, pulsed, excitation airstream to be generated outwardly form the cavity, out of the output slot and into the developing shear layer of the exhaust airflow. This high frequency, pulsed, excitation airstream induces modifications in the shear layer, which leads to a major reduction in the noise and buffeting generated by the developing shear layer.

公开(公告)号：EP1099050B1

公开(公告)日：2002-10-23

申请号：EP99936592.7

申请日：1999-07-22

申请人： Nagel, Friedmund

发明人： Nagel, Friedmund

IPC分类号： F02C7/045 ,  F02K1/82

CPC分类号： F02C7/045 ,  F02K1/827 ,  F05D2260/962 ,  Y02T50/671

摘要： The invention relates to a device and a method for actively reducing the noise emissions of a jet engine (1) comprising an air inlet (3), a gas outlet (4) and an engine (5) which is situated between the air inlet (3) and the gas outlet (4). At least one first electroacoustic transducer (7, 7') is situated in the air inlet (3) before the engine (5) and/or in the gas outlet (4) after the engine (5). Said first electroacoustic transducer converts sound waves (30) into first signals (31) which are a measure of the frequency, amplitude and phase of the sound waves (30). An electronic control unit (16, 16') converts the first signals (31) into second signals (32). At least one second electroacoustic transducer (8, 8') is situated centrally in the air inlet (3) before the engine (5) and/or centrally in the gas outlet (4) after the engine (5). Said second electroacoustic transducer converts the second signals (32) into compensating sound waves (33) which have a frequency, amplitude and phase so that the sound waves (30) and the compensating sound waves (33) at least partially cancel each other out. The device can also be used for diagnosing the status or functioning of the jet engine and to this end, has a comparison unit (17, 17') in which the first signals (31) of the first electroacoustic transducer (7, 7') are compared with specified signals.

公开(公告)号：EP1191205A1

公开(公告)日：2002-03-27

申请号：EP01402409.5

申请日：2001-09-20

申请人： Snecma Moteurs

发明人： Antoine, Angélique Hélène ,  Bouty, Eric Jean-Louis ,  Thomas, Alain Alphonse Léopold

IPC分类号： F02C7/045

CPC分类号： F02C7/045 ,  F05D2260/96 ,  F05D2260/962

摘要： Le procédé pour atténuer les sons créés par l'interaction des aubes mobiles (1) d'un rotor et des aubes fixes (2) d'un stator disposées en aval des aubes mobiles (1), consiste à injecter des jets continus (14) de fluide en amont des aubes mobiles (1) à travers des orifices (11) en nombre égal au nombre des aubes fixes (2).
Les orifices (11) sont ménagés dans un anneau (10) et susceptibles de pivoter autour de l'axe du rotor d'un angle au moins égal au pas angulaire de deux aubes fixes (2) consécutives. La position angulaire de l'anneau est réglée pour que les sons produits par l'interaction des jets (14) et des aubes mobiles (1) soient en opposition de phase avec ceux produits par l'interaction des aubes mobiles (1) et des aubes fixes (2).

摘要翻译： 下游可以通过注入压缩空气射流（14）的动叶片的上游减少（1）与固定叶片动叶片的相互作用上的送风机所产生的噪音。 压缩的空气从一次流（12）和进料至环（10）与尽可能多的孔（11）有固定刀片占据。 一种电动机（15）允许环被旋转以找到反相的刀片间噪声独立权利要求中对设备进行使用哪个计数器的方法作用刀片间噪声产生的声音的位置

公开(公告)号：EP1115967A2

公开(公告)日：2001-07-18

申请号：EP99964945.2

申请日：1999-09-16

申请人： VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.

发明人： BURDISSO, Ricardo ,  SMITH, Jerome P.

IPC分类号： F02K3/02 ,  F01N1/02

CPC分类号： B64D33/02 ,  B64D2033/0206 ,  B64D2033/0286 ,  F02C7/045 ,  F04D29/663 ,  F05D2260/96 ,  F05D2260/962 ,  G10K11/175 ,  Y02T50/671

摘要： An array of adaptive or fixed Herschel-Quincke tubes (1) aligned in a circumferential or helical array about an inlet (38) of a turbofan engine. The array of tubes effectively divide the acoustic energy generated by the engine. One of the energy components propagates within the tubes while the other propagates within the engine compartment. The acoustic energy within the tubes is reintroduced into the engine compartment to cancel the acoustic energy remaining in the engine as it propagates from the fan (36) towards the inlet and the outlet (34) openings.

公开(公告)号：EP1099045A1

公开(公告)日：2001-05-16

申请号：EP99938321.9

申请日：1999-07-22

申请人： Nagel, Friedmund

发明人： Nagel, Friedmund

IPC分类号： F01N1/06 ,  G10K11/178

CPC分类号： F02C7/045 ,  F01N1/065 ,  F01N3/2885 ,  F05D2260/962 ,  G10K11/178

摘要： The invention relates to a device and a method for actively reducing the noise emissions of internal combustion engines (1) in an exhaust pipe (2) which guides a stream of exhaust gas (3). To this end, the device has at least one first electroacoustic transducer (3) for converting the sound waves (30) into first signals (31) which are a measure of the frequency, amplitude and phase of the sound waves (30). An electronic control unit (14) converts the first signals (31) into second signals (32). At least one second electroacoustic transducer (15), which is situated centrally in the stream of exhaust gas (3), converts the second signals (32) into compensating sound waves (33) which have a frequency, amplitude and phase so that the sound waves (30) and the compensating sound waves (33) at least partially cancel each other out. The device can also be used for diagnosing the status or functioning of the internal combustion engine and to this end, has a comparison unit (23) in which the first signals (31) of the first electroacoustic transducer (13) are compared with specified signals.

公开(公告)号：EP0715066A3

公开(公告)日：1999-03-03

申请号：EP95307862.3

申请日：1995-11-03

申请人： GENERAL ELECTRIC COMPANY

发明人： Gliebe, Philip Roger

IPC分类号： F02C7/045 ,  G10K11/00

CPC分类号： B64D33/02 ,  B64D2033/0206 ,  B64D2033/0286 ,  F02C7/045 ,  F05D2220/327 ,  F05D2260/962 ,  G10K11/178 ,  G10K2210/107 ,  G10K2210/112 ,  G10K2210/121 ,  G10K2210/3032 ,  G10K2210/3045 ,  G10K2210/3217 ,  G10K2210/509 ,  G10K2210/511

摘要： A gas turbine engine fan assembly includes an equal number of rotor blades and stator vanes spaced axially therefrom. An annular duct surrounds the blades and vanes and has an inlet for receiving air and an outlet for discharging at least a portion of the air upon compression by the blades. The fan duct further includes a passive acoustic liner tuned for attenuating at least one harmonic noise tone generated by the blades, with a fundamental blade passing frequency noise tone being actively attenuated by a plurality of anti-noise sound transmitters disposed in the fan duct.