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특허 상세정보

Acousto-fluidic driver for active control of turbofan engine noise

국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) F15C-001/04    F15C-001/12    ..FS:    137/828    14    803   
미국특허분류(USC) 137/14 ; 137/828
출원번호 US-0498489 (1995-09-11)
발명자 / 주소
출원인 / 주소
인용정보 피인용 횟수 : 11  인용 특허 : 12

Reduction or cancellation of acoustic noise is achieved by providing an amplified, oppositely phased version of the noise by means of an acousto-fluidic amplifier. The amplified acoustic output noise is delivered through an impedance matching horn in destructively interfering relation with the original noise. Depending on the acoustic noise source and its spatial distribution, the acousto-fluidic amplifier may be a single stage amplifier or multiple stages connected in parallel and/or cascade, with output horns spatially distributed to have the maximum c...


The method of reducing noise emanating into an environment, said method comprising the steps of: (a) sensing acoustic energy in said environment; (b) providing an acoustic input wave proportional to the sensed acoustic energy; (c) in response to said acoustic input wave, generating, via fluidic amplification, a fluidically amplified sound signal proportional to the sensed acoustic energy, without using mechanical moving parts and electronic components to effect amplification; (d) delivering said amplified sound signal to a location in said environment wh...

이 특허에 인용된 특허 (12)

  1. Wanke Ronald L. (1960 N. Lincoln Park West Chicago IL 60614). Acoustic abatement method and apparatus. USP1976023936606.
  2. Kraft Robert E. (Cincinnati OH) Kontos Karen B. (Loveland OH). Active acoustic liner. USP1996035498127.
  3. Suzuki Seiichirou (Yokohama JPX). Active noise control apparatus. USP1994125377275.
  4. Ziegler Eldon W. (Columbia MD) Gardner John W. (Silver Springs MD). Active sound attenation system for engine exhaust systems and the like. USP1992035097923.
  5. Drzewiecki Tadeusz M. (Silver Spring MD). Broad band flueric amplifier. USP1983024373553.
  6. Pickett ; Charles G. ; Pickett ; Ronald S.. Device for simultaneous modulation and amplification of low frequency sound s. USP1978104121620.
  7. Pickett Charles G. (Fort Lee NJ) Pickett Ronald S. (Fort Lee NJ). Device for simultaneous modulation and amplification of low frequency sounds. USP1976123999625.
  8. Glezer Ari (5945 N. Mina Vista Tucson AZ 85718) Nygaard Kris J. (4815 W. Las Palmaritas Glendale AZ 85302) Wiltse John M. (405 E. Prince Rd. ; Apt. 412 Tucson AZ 85705). Method and apparatus for controlled modification of fluid flow. USP1991085040560.
  9. Pickett Charles G. (293 Greenbrook Rd. North Plainfield NJ 07060). Method and apparatus for fluid sound amplification and detection of low frequency signals. USP1981034258754.
  10. Davidson ; Jr. Allen R. (Bowie MD) Robinson Timothy G. F. (Severna Park MD). Noise cancellation apparatus. USP1977054025724.
  11. Gurney ; Jr. John O. (Kensington MD). Photofluidic audio receiver. USP1987084689827.
  12. Drzewiecki Tadeusz M. (Silver Spring MD) Toda Kenji (Rockville MD) Gurney John (Kensington MD). Photofluidic interface. USP1985044512371.