초록 ▼

A high efficiency broadband acoustic resonator and absorption panel used for reducing engine noise from high bypass fan jet engines mounted on an aircraft. The panel uses a single layer of cellular honeycomb core with a pair of parallel acoustic septums formed internally in the core for attenuating

A high efficiency broadband acoustic resonator and absorption panel used for reducing engine noise from high bypass fan jet engines mounted on an aircraft. The panel uses a single layer of cellular honeycomb core with a pair of parallel acoustic septums formed internally in the core for attenuating high and medium frequency sounds during all engine operations as well as the low frequency combination tone and “buzzsaw”noise experienced during high power aircraft takeoff and cutback engine power settings.

대표청구항 ▼

A sound attenuating panel for installation in the high velocity air flow region of an engine nacelle and other applications requiring acoustic treatment, the panel comprising: a single layer of cellular honeycomb core; a first sheet of permeable facing material attached to the top surface of the cor

A sound attenuating panel for installation in the high velocity air flow region of an engine nacelle and other applications requiring acoustic treatment, the panel comprising: a single layer of cellular honeycomb core; a first sheet of permeable facing material attached to the top surface of the core; a first acoustic perforated septum formed internally in the core and parallel to the first sheet, the first septum made up of a plurality of strips having a width W1 and gap G1 therebetween; a second acoustic septum formed internally in the core and parallel to the first septum, the second septum disposed in a spaced relationship below the first septum and made up of a plurality of strips having a width W2 and gap G2 therebetween, the width W2 of the second septum being greater than the gap G1 with the strips of the second septum indexed below the gaps G1 of the first septum.