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

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

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F01D-025/00
출원번호	US-0143603 (1993-11-01)
발명자 / 주소	Pla Frederic G. (Schenectady NY) Rajiyah Harindra (Clifton Park NY) Renshaw Anthony A. (Albany NY) Hedeen Robert A. (Clifton Park NY)
출원인 / 주소	General Electric Company (Schenectady NY 02)
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 a feedback signal proportional to displacement of the noise radiating element and a signal corresponding to the blade passage frequency of the engine\s fan. In response, the controller determines a control signal which is sent to the drivers, causing them to expand or contract. The noise radiating structure may be either the outer shroud of the engine or a ring mounted flush with an inner wall of the shroud or disposed in the interior of the shroud.

대표청구항 ▼

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 frequency tuning controller being responsive to said blade passage frequency signal to determine a frequency control signal which is sent to said means for applying a variable force, said frequency control signal causing said means for applying a variable force to vary the force applied to said outer shroud; means for sensing noise generated by said engine, said means for sensing noise producing an error signal corresponding to the level of noise sensed; and a noise cancellation controller having an input connected to said means for sensing noise, another input connected to said means for producing a blade passage frequency signal, and an output connected to said means for inducing vibrations, said noise cancellation controller being responsive to said error signal and said blade passage frequency signal to determine a noise control signal which is sent to said means for inducing vibrations, said noise control signal causing said means for inducing vibrations to vibrate said outer shroud and generate a noise field which minimizes the total noise emanating from said engine.

이 특허를 인용한 특허 (36)

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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저장형식	Text(ASCII format) Excel format PIAS분석(.xls)
메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
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연합인증

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

초록 ▼

대표청구항 ▼

연구과제 타임라인

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

초록 ▼

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연구과제 타임라인

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이 특허를 인용한 특허 (36)

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