Noise control characteristics of synchrophasing - An analytical investigation

v I n t h i s paper the noise control characteris-t i c s of synchrophasing are investigated using a s i m p l i f i e d model of an a i r c r a f t fuselage. The analysis presented here includes d i r e c t i v i t y effects o f the noise sources and solves i n closed various synchrophase angles as well as the s h e l l v i b r a t i o n a l response and input power flow i n order t o uncover t h e p r i n c i p a l mechanisms behind the transmission phenomena. W W I i n t e n s i t y 133 (3,3) element of inverse matrix k; kns KP a L n Pex rP R a s t r a d i a l wavenumber a x i a l wavenumber pressure integrand source index number matrix term circumferential mode number acoustic pressure of external f i e l d acoustic pressure of i n t e r i o r f i e l d spectral pressure due t o monopole source pressure amp1 i t u d e o f monopole source nondimensional acoustic pressure acoustic power nondimensional acoustic power c y l i n d r i c a l coordinate r a d i a l l o c a t i o n of monopole source phase lead of dipole source component synchrophase angle angular l o c a t i o n of dipole source comnonent den; ; t ;