INVESTIGATION ON SOUND FIELD MODEL OF PROPELLER AIRCRAFT—THE EFFECT OF VIBRATING FUSELAGE BOUNDARY

An improved sound field model with multiple propeller noise sources and finite fuselage boundary has been developed for the prediction of propeller aircraft noise by using the acoustic analogy method. It involves the effects of fuselage boundary with arbitrary shape and coupling of multiple propeller sources. It is also applicable to solving the interaction between any known boundary and harmonic sound source. The model has been used to calculate the sound field of propeller aircraft Y12 with rigid fuselage boundary and the sound field of rigid sphere in planar harmonic sound wave. The latter has an analytical solution which could be used to check the present method. The calculation results show that the model is reasonable and valuable.