ACTIVE REDUCTION OF AIRPORT NOISE

Noise from aircraft run-ups and departure operations at airports can be a continuing source of annoyance to residents living near the airport. Barriers and sound insulation modifications to houses can reduce the impact of the noise; however, the noise to the rear of a jet aircraft is predominantly low frequency, which is not well attenuated by these passive methods. Recent advancements in active noise reduction offer an alternative solution for reducing low-frequency aircraft noise by using loudspeakers to create localized areas of quiet. In this paper the authors present results from a model which predicts the size of the noise reduction area as a function of the system parameters and configuration. These predictions are then compared with data measured during the application of an active noise reduction system outside a commercial airport. For the covering abstract see ITRD E107776.