公开(公告)号：AU663194B2

公开(公告)日：1995-09-28

申请号：AU4102993

申请日：1993-04-14

Applicant: UNITED TECHNOLOGIES CORP

Inventor： YOERKIE CHARLES A ,  WELSH WILLIAM A ,  SHEEHY THOMAS W

IPC: B64C27/51 ,  B64C27/00 ,  F16F15/00 ,  F16F15/02 ,  G10K11/178

Abstract: An active noise control (ANC) system for a helicopter that is operative to effectively nullify one or more high frequency vibrations emanating from the main transmission gearbox thereof at the gearbox/airframe interface, thereby significantly reducing the interior noise levels of the helicopter, that is design optimized to minimize the number of actuators required, and that is design optimized to minimize contamination forces arising from operation of the system actuators. The ANC system includes modified transmission beams that are mechanically stiffened to function as rigid bodies with respect to the one or more of the high frequency vibrations, a plurality of actuators disposed in combination with the modified transmission beams, a plurality of sensors disposed in combination with the modified transmission beams in a collinear, spaced apart functional correlation with respective actuators, and controllers interconnecting individual actuators with respective functionally correlated sensors.

公开(公告)号：CA2132198A1

公开(公告)日：1993-10-28

申请号：CA2132198

申请日：1993-04-14

Applicant: UNITED TECHNOLOGIES CORP

Inventor： WELSH WILLIAM A ,  YOERKIE CHARLES A ,  SHEEHY THOMAS W

IPC: B64C27/51 ,  B64C27/00 ,  F16F15/00 ,  F16F15/02 ,  G10K11/178 ,  G10K11/16

Abstract: An active noise control (ANC) system for a helicopter that is operative to effectively nullify one or more high frequency vibrations emanating from the main transmission gearbox thereof at the gearbox/airframe interface, thereby significantly reducing the interior noise levels of the helicopter, that is design optimized to minimize the number of actuators required, and that is design optimized to minimize contamination forces arising from operation of the system actuators. The ANC system includes modified transmission beams that are mechanically stiffened to function as rigid bodies with respect to the one or more of the high frequency vibrations, a plurality of actuators disposed in combination with the modified transmission beams, a plurality of sensors disposed in combination with the modified transmission beams in a collinear, spaced apart functional correlation with respective actuators, and controllers interconnecting individual actuators with respective functionally correlated sensors.

公开(公告)号：ES2095645T3

公开(公告)日：1997-02-16

申请号：ES93910595

申请日：1993-04-14

Applicant: UNITED TECHNOLOGIES CORP

Inventor： YOERKIE CHARLES A ,  WELSH WILLIAM A ,  SHEEHY THOMAS W

IPC: B64C27/51 ,  B64C27/00 ,  F16F15/00 ,  F16F15/02 ,  G10K11/178

Abstract: An active noise control (ANC) system for a helicopter that is operative to effectively nullify one or more high frequency vibrations emanating from the main transmission gearbox thereof at the gearbox/airframe interface, thereby significantly reducing the interior noise levels of the helicopter, that is design optimized to minimize the number of actuators required, and that is design optimized to minimize contamination forces arising from operation of the system actuators. The ANC system includes modified transmission beams that are mechanically stiffened to function as rigid bodies with respect to the one or more of the high frequency vibrations, a plurality of actuators disposed in combination with the modified transmission beams, a plurality of sensors disposed in combination with the modified transmission beams in a collinear, spaced apart functional correlation with respective actuators, and controllers interconnecting individual actuators with respective functionally correlated sensors.

公开(公告)号：AU4102993A

公开(公告)日：1993-11-18

申请号：AU4102993

申请日：1993-04-14

Applicant: UNITED TECHNOLOGIES CORP

Inventor： YOERKIE CHARLES A ,  WELSH WILLIAM A ,  SHEEHY THOMAS W

IPC: B64C27/51 ,  B64C27/00 ,  F16F15/00 ,  F16F15/02 ,  G10K11/178

Abstract: An active noise control (ANC) system for a helicopter that is operative to effectively nullify one or more high frequency vibrations emanating from the main transmission gearbox thereof at the gearbox/airframe interface, thereby significantly reducing the interior noise levels of the helicopter, that is design optimized to minimize the number of actuators required, and that is design optimized to minimize contamination forces arising from operation of the system actuators. The ANC system includes modified transmission beams that are mechanically stiffened to function as rigid bodies with respect to the one or more of the high frequency vibrations, a plurality of actuators disposed in combination with the modified transmission beams, a plurality of sensors disposed in combination with the modified transmission beams in a collinear, spaced apart functional correlation with respective actuators, and controllers interconnecting individual actuators with respective functionally correlated sensors.