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Engine noise suppression kit for the nacelles of a jet aircraft
| Details |
Inventors: Wiseman, Albert D.;
Assignee: Airborne Express, Inc. (Wilmington, OH)
Primary Examiner: Fuller; Benjamin R.
Assistant Examiner:
Attorney, Agent or Firm: Frost & Jacobs
An engine noise suppression kit for use on the inside surfaces of the cowlings or doors of conventional jet aircraft nacelles surrounding the jet aircraft engines. Each nacelle cowling or door comprises a skin mounted on a framework made up of longitudinal stringers and transversely extending ribs or formers. The formers divide the inside surface of the nacelle cowlings or doors into bays surrounding the jet engine located within the nacelle. The kit comprises a plurality of sound attenuating modules adapted to be affixed to an adjacent pair of cowling or door formers and to span the bay defined thereby such that at least those bays surrounding the combuster chamber/turbine area of the jet engine are covered by said modules. Each module constitutes a sealed metallic basket comprising a pair of perforated metallic panels spaced from each other by a surrounding metallic framework. The facing surfaces of said metallic panels being covered by silicon rubber-coated glass cloth. Acoustic material fills the remaining space between said panels. The surrounding metallic framework of each module has laterally extending flanges by which the module is attached to those formers defining its respective bay. The modules are arranged end to end in their respective bays. |
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DETAILED DESCRIPTION OF THE INVENTION In the exemplary embodiment utilized to explain the nature of the present invention, the aircraft has two jet engines, the jet engine nacelle for each engine has two (upper and lower) cowling or door members.
The lower left-hand engine nacelle door is illustrated in FIG.
1.
Upper left-hand, lower right-hand and upper right-hand doors are illustrated in FIGS.
8, 9 and 10, respectively.
All of the door members are of the same general construction, each being provided with its own particular appurtenances.
The lower left-hand engine nacelle door of FIG.
1 is generally indicated at 1.
The door 1 comprises a framework made up of a plurality of ribs or formers 2 through 16.
The formers 2 through 16 differ from each other in length and configuration, but are generally formed of Z-shaped aluminum members, as shown in FIGS.
6 and 7.
The formers 2 through 16 are provided with gussets 17 at their ends and are attached at their ends to a pair of longitudinally extending stringers 18 and 19.
The stringer 18 carries a plurality of latches 20 and the stringer 19 carries a plurality of hinges 21.
The latches 20 and hinges 21 constitute the means by which the two door elements are mounted and latched to the jet engine nacelle.
The aluminum skin 22 of door 1 is appropriately affixed to the former and stringer framework.
The formers 2 through 16 divide the door 1 into 14 bays 23 through 36.
As viewed in FIG.
1, the left-hand end of door 1 constitutes the forward end and the right-hand end of door 1 constitutes the rearward or aft end.
The aft seven bays 30 through 36 of door 1, and the corresponding bays of the other door of the nacelle, surround the combuster chamber/turbine area of the jet engine.
The engine noise supression kit of the present invention comprises a plurality of sound attenuating modules located in the aft seven bays, and affixed to the formers defining these bays, of each of the four nacelle doors.
Reference is now made to FIG.
2, wherein the door 1 of FIG
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