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Aircraft Landing Gear Dynamics Present and Future
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English
Abstract
This paper reviews the current state-of-the-art in aircraft landing gear dynamics and presents recommendations for new areas of research in this field. The paper begins by reviewing some of the shortcomings the author has experienced in conducting shimmy investigations on various aircraft. Included in this review are the problems associated with obtaining both landing gear structural parameters and aircraft tire parameters. Some discussion is also made of the problems with current landing gear dynamics mathematical models. On the basis of all of these problems, recommendations are then made for future research. The main content of these recommendations are to develop three documents that will completely define a general landing gear dynamics mathematical/computer model that will be able to analyze the problems of gear walk, shimmy, dynamic response to rough runways, antiskid brake induced oscillations, tire-out-of-round, and wheel imbalance. The first document will completely define the mathematical model. The second document will update the TR-64 technical report by Smiley and Home on Mechanical Properties of Pneumatic Tires with Special Reference to Modern Aircraft Tires by examining both bias ply and radial tires. The third document will classify landing gear structures into various types in a manner similar to the way TR-64 defines tire types and then examines the structural parameters needed by the comprehensive mathematical model. The overall aim of the paper is to develop a unified, consistent approach to the design of landing gear systems.
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Citation
Krabacher, W., "Aircraft Landing Gear Dynamics Present and Future," SAE Technical Paper 931400, 1993, https://doi.org/10.4271/931400.Also In
References
- Shimmy Analysis for the F-15 Nose Landing Gear Report Southerland K.F. McDonnell-Douglas Aircraft Company 1973
- The Experimental Measurement of the T-46 Nose Landing Gear Shimmy Parameters Krabacher William E. ASD/ENFSL, Wright-Patterson AFB OH 1985
- Mechanical Properties of Pneumatic Tires with Special Reference to Modem Aircraft Tires Smiley Robert F. Home Walter B. NASA-Langley Langley Research Center Langley Field VA 1960
- Technical Data Supplied to the Author McDonnell-Douglas 1979
- A Dynamic Shimmy Analysis Krabacher William E. ASD/ENFSL, Wright-Patterson AFB OH 1981
- Shimmying of a Pneumatic Wheel Schlippe B. Von Dietrich R. 1941 NACA
- The Story of Shimmy Moreland William J. Journal of the Aeronautical Sciences 793 808 1954
- An Analytical Investigation of Damping of Landing Gear Shimmy Feld Denis J. SAE Technical Paper Series 902015 1990