Abstract:

Based on the assumption of quasisteady model, and with the using of the new developed semiempirical prediction formula for aircraft noise source, an improved model and a method to predict the flyover noise of the largescale commercial aircraft with turbofan engine are developed in this paper. The centralized point source model is changed to the distributed point source model in the prediction procedure. The new semiempirical prediction formula of the fan noise and jet noise are used to suit for the advanced ultrahigh bypass (UHB) engines.

Key words: noise , prediction, engine , noise, airframe , noise, aircraft , noise, noise , prediction