The noise situation inside modern helicopter cabins is still unsatisfying in comparison to modern jet or turboprop commercial aircraft. The piloting crews as well as the passengers are exposed to high noise level dominated by very annoying tonal components caused mainly by gear-meshing and jet engines. The requirement of a quieter helicopter needs a systematic study of the NVH behavior, with special attention to helicopter operational conditions. In this context, an experimental vibro-acoustic analysis of the helicopter can help identify relevant noise and vibration sources. For these reasons the authors have performed a wide experimental vibro-acoustic campaign in a EC-135 helicopter interior cabin, which aims at evaluating the importance of the noise contribution produced by the jet engines with respect to the gearbox. This research is carried out in the frame of the project "FRIENDCOPTER" which aims at developing innovative technologies and tools to support the vibro-acoustic design...
Acoustical signature analysis of a helicopter cabin in steady-state and run up operational conditions
MUCCHI, Emiliano;
2008
Abstract
The noise situation inside modern helicopter cabins is still unsatisfying in comparison to modern jet or turboprop commercial aircraft. The piloting crews as well as the passengers are exposed to high noise level dominated by very annoying tonal components caused mainly by gear-meshing and jet engines. The requirement of a quieter helicopter needs a systematic study of the NVH behavior, with special attention to helicopter operational conditions. In this context, an experimental vibro-acoustic analysis of the helicopter can help identify relevant noise and vibration sources. For these reasons the authors have performed a wide experimental vibro-acoustic campaign in a EC-135 helicopter interior cabin, which aims at evaluating the importance of the noise contribution produced by the jet engines with respect to the gearbox. This research is carried out in the frame of the project "FRIENDCOPTER" which aims at developing innovative technologies and tools to support the vibro-acoustic design...I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
