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특허 상세정보

Active noise control using noise source having adaptive resonant frequency tuning through variable ring loading

국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) F01D-025/00   
미국특허분류(USC) 415/118 ; 415/119 ; 181/206 ; 244/1N
출원번호 US-0143603 (1993-11-01)
발명자 / 주소
출원인 / 주소
인용정보 피인용 횟수 : 36  인용 특허 : 0
초록

A noise source for an aircraft engine active noise cancellation system in which the resonant frequency of noise radiating structure is tuned to permit noise cancellation over a wide range of frequencies. The resonant frequency of the noise radiating structure is tuned by a plurality of drivers arranged to contact the noise radiating structure. Excitation of the drivers causes expansion or contraction of the drivers, thereby varying the edge loading applied to the noise radiating structure. The drivers are actuated by a controller which receives input of ...

대표
청구항

An apparatus for minimizing noise emanating from an aircraft engine which has an outer shroud and a fan, said apparatus comprising: means for inducing vibrations coupled to said outer shroud; means for applying a variable force to said outer shroud; means for producing a blade passage frequency signal corresponding to the blade passage frequency of said fan; a frequency tuning controller having an input connected to said means for producing a blade passage frequency signal and an output connected to said means for applying a variable force, said frequenc...

이 특허를 인용한 특허 피인용횟수: 36

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