Active noise control of a single-engine light aircraft cabin

Abstract

Active noise control (ANC) shows success and potential in a growing number of commercial applications, one of which is aircraft cabin noise reduction. With the exception of utilizing ANC headsets, light aircraft, which to date offer a high noise environment, have been somewhat overlooked. The importance of weight minimization also prevents installing copious quantities of dampening and insulation materials as a passive noise control measure. While headsets are a pilot’s necessity and an obvious target for ‘‘localized’’ noise reduction, they are not conducive to either operator or passenger comfort. High noise levels not only render communication difficult but also contribute toward stress and fatigue. A more globalized region of reduced noise will be less restrictive and no doubt provide the occupants with more freedom of movement and overall comfort. Light aircraft operators boasting quieter cabins with a focus on customer comfort will no doubt have a distinct commercial advantage. Using flight trials and laboratory experiments as a basis, this paper will discuss the introduction of ANC into a four-seater Piper Archer. Existing noise levels, objectives, equipment used, methods of approach, and results to date shall be reviewed, as well as the remaining work required to achieve the final goal.