FIELD: transport.
SUBSTANCE: aircraft gondola contains channel which goes from air intake to gondola rear part and covered with acoustic panel containing reflecting layer, cellular structure and acoustically resistive structure. The acoustically resistive structure forms channel airfoil along the surface of which at least one acoustic wave is propagated. At least one of acoustic panel characteristics influences complex impedance of the mentioned panel which impedance changes in direction of propagation of at least one acoustic wave. At least one characteristic of acoustic panel influencing complex impedance is constant in areas located at air intake level and at gondola rear pert level and continuously varies between the mentioned areas.
EFFECT: invention makes possible to provide optimal reduction of noise level along surface of aircraft gondola.
4 cl, 5 dwg
