NACRE (II)Project coordinator(s)
Prof. Henry Rice
Tel: +353 1 896 1996
Mr. Ciarán O'Reilly
Tel: +353 1 896 1134
Near-ground aircraft operating noise is a leading contributor to
environmental noise, which authorities curtail by imposing direct noise
penalties, limitating operating hours and specifying threshold values
for noise certification of new aircraft. As a result, reducing the
aircraft noise generated on takeoff and approach is an essential
consideration in the design of new commercial aircrafts.
A novel approach to reduce the aircraft engine noise that propagates
towards the ground, under consideration as part of the European FP6
Project 'Novel Aircraft Concepts REsearch' (NACRE), is to position the
engines high on the rear of the aircraft fuselage so that a new U-shaped
empennage design would potentially act as a noise shield or barrier.
Design evaluation tools are to be developed which can acoustically
evaluate such shielding configurations within the time and computational
constraints of industry. Noise generators, such as the fan and the
exhaust jet, are modelled numerically as acoustic sources and propagated
around the shield to receivers in the far-field. Predictions of the
reduction in sound pressure level at the receiver are to be validated
with test data.
European Commission FP6