The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 24, 1992
Filed:
Nov. 19, 1991
Kanichi Amano, Tokyo, JP;
Kiyoshi Okura, Takasago, JP;
Kazuo Izumiyama, Takasago, JP;
Katsuya Matsuzaki, Nagoya, JP;
Katsuhiko Shibata, Nagoya, JP;
Mitsubishi Jukogyo Kabushiki Kaisha, Tokyo, JP;
Japan Aircraft Development Corporation, Tokyo, JP;
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.