Fuselage wall inner lining plate

Details Fuselage wall inner lining plate Fuselage wall inner lining plate

1991-11-19

1992-11-24

Marmor, Charles A.

Aeronautics and astronautics

Aircraft structure

Fuselage and body construction

244123, 428119, B64C 140

Patent

active

051656272

ABSTRACT:
The present invention is drawn to an improvement in the configuration of an inner lining plate of an aircraft fuselage wall, which will result in the sound transmission loss (TL) of the inner lining plate to occur in a frequency range covering the frequencies of external noises such as propeller sound, such that external noises transmitted from the inside of the aircraft fuselage can be reduced. The improvement resides in that a tensile rigidity in the circumferential direction of a substantially cylindrical fuselage wall inner lining plate is less than the tensile rigidity in the axial direction thereof. In this respect, the inner lining plate is provided with a large number of parallel crests extending in the axial direction. Alternatively, the substantially cylindrical fuselage wall inner lining plate can be made of fiber-reinforced plastics, in which fibers are woven in the axial direction in a mode different from that in which they are woven in the circumferential direction to provide an anisotropic property in which tensile rigidity in the circumferential direction is less than in the axial direction.

REFERENCES:
patent: 2069413 (1937-02-01), Leadbetter
patent: 2095626 (1937-10-01), Bassett et al.
patent: 2111326 (1938-03-01), Norris
patent: 2836267 (1953-05-01), Reinhold
patent: 3995080 (1976-11-01), Cogburn et al.
patent: 3995081 (1976-11-01), Fant et al.
patent: 4198018 (1980-04-01), Brault
Koval, Leslie R., "Effect of Air Flow, Panel Curvature, and Internal Pressurization of Field-incidence Transmission Loss", J. Acoust. Soc. Am., vol. 59, No. 6, Jun. 1976, pp. 1379-1385.
Koval, L. R., "On Sound Transmission into an Orthotropic Shell", Journal of Sound and Vibration 63(1), (1979), pp. 51-59.
Koval, Leslie R., "Sound Transmission Into a Laminated Composite Shell", Journal of Sound and Vibration, 71(4), (1980), pp. 523, 530.

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