최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0335271 (1994-10-11) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 5 인용 특허 : 0 |
A ducted axial fan for large diameter ducts (11) which includes equidistantly spaced sensors (22,23) upstream and downstream of an axial fan and spaced actuators (24, 26) located around the periphery of said duct to cancel tonal noise caused by the air turbulence generated by the rotation of the fan
In a duct having a multi-bladed axially mounted fan means with multiple blades and an intake side and an exhaust side mounted therein creating a rotating sound field, the improvement comprising a first sensor means mounted upstream of said fan means, a second sensor means mounted downstream of said
※ AI-Helper는 부적절한 답변을 할 수 있습니다.