Optimization of an oleo-pneumatic shock absorber of an aircraft during landing
01 Aug 1977-Journal of Aircraft (American Institute of Aeronautics and Astronautics (AIAA))-Vol. 14, Iss: 8, pp 822-823
About: This article is published in Journal of Aircraft.The article was published on 1977-08-01. It has received 3 citations till now. The article focuses on the topics: Shock absorber.
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26 Apr 2021
TL;DR: In this article, an auxiliary fixture is designed to transfer the vibration energy of the aeroengine casing to the auxiliary fixture so as to reduce the vibration of the casing itself, and the results show that the maximum vibration amplitude of the aircraft casing is reduced by 60% and the average vibration amplitude is also significantly reduced.
Abstract: Due to the thin and rigid wall of aeroengine casing, it is easy to reduce the machining accuracy for the vibration of machine tools and cutting tools. Therefore, this paper designed an auxiliary fixture that can suppress such vibration. According to the vibration absorption principle of the tuned mass damper, this fixture is designed to transfer the vibration energy of the casing to the auxiliary fixture so as to reduce the vibration of the casing itself. According to An sy’s work bench analysis, this fixture can significantly reduce the vibration of the casing. The results show that the maximum vibration amplitude of the casing is reduced by 60%, and the average vibration amplitude is also significantly reduced. The auxiliary fixture has many advantages such as simple installation, simple disassembly and installation, strong expansibility and so on.
1 citations
Cites background from "Optimization of an oleo-pneumatic s..."
...(2) The three bolt openings are all 20mm, and the dimensional accuracy is mm, and the fit between the bolt hole and bolt rod is F8/ H7....
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...2 1 2 2 ( ) [ ( ) ( )] ( ) ( ) 0 m x t c x t x t k x t k x t ′′ ′ ′ + − − + = (2) Among them, m1, c1, k1, respectively represent the mass, damping ratio and spring stiffness of the main structure....
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...(2) Through the modal analysis results of the casing fixture, it can be seen that the auxiliary fixture reduces the casing vibration amplitude by 60%....
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...(2) A groove with an outer dimension of 60mm×8mm×8mm is cut at 40mm away from the top and bottom of the pressing plate respectively to place the torsion spring....
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01 Jan 2008
TL;DR: In this article, a dynamic load analysis for swinging arm type landing gear was performed to predict landing loads and the optimum landing loads were generated through adjustment of damping orifice and the analysis results were presented with various aircraft attitude.
Abstract: Role of landing gear is to absorb energy which is generated by aircraft ground maneuvering and landing. Generally, in order to absorb the impact energy, oleo-pneumatic type shock absorber is used in aircraft landing gear. Oleo-pneumatic type shock absorber has a good energy absorption efficiency and is light in weight because structure of oleo-pneumatic type shock strut is relatively simple. In this study, dynamic load analysis for swinging arm type landing gear was performed to predict landing loads. Modeling of landing gear was conducted with MSC.ADAMS, and dynamic landing loads were analyzed based on ADS-29. Optimum landing loads were generated through adjustment of damping orifice and the analysis results were presented with various aircraft attitude.
1 citations
Additional excerpts
...4로부터 완충기 내부의 두 베어링에 작용 하는 마찰력을 구하면 식 (6)~(8)과 같다....
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References
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01 Jan 1953
TL;DR: In this article, a theoretical study of the behavior of the conventional oleo-pneumatic landing gear during the process of landing impact is presented in a general form and treats the motions of the landing gear prior to and subsequent to the beginning of shock-strut deflection.
Abstract: This report presents a theoretical study of the behavior of the conventional type of oleo-pneumatic landing gear during the process of landing impact. The basic analysis is presented in a general form and treats the motions of the landing gear prior to and subsequent to the beginning of shock-strut deflection. The applicability of the analysis to actual landing gears has been investigated for the particular case of a vertical landing gear in the absence of drag loads by comparing calculated results with experimental drop-test data for impacts with and without tire bottoming. The calculated behavior of the landing gear was found to be in good agreement with the drop-test data.
60 citations
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27 Jun 1972
11 citations