NASA Technical Note

NASA Technical Note
Author:
Publisher:
Total Pages: 1004
Release: 1966
Genre: Aeronautics
ISBN:

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An Overview of Landing Gear Dynamics

An Overview of Landing Gear Dynamics
Author: Jocelyn I. Pritchard
Publisher:
Total Pages: 22
Release: 1999
Genre: Aerodynamics
ISBN:

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On of the problems facing the aircraft community is landing gear dynamics, especially shimmy and brake-induced vibration. Shimmy and brake-induced vibrations can lead to accidents due to excessive wear and shortened life of gear parts and contribute to pilot and passenger discomfort. To increase understanding of these problems, a literature survey was performed. The major focus is on work from the last ten years. Some older publications are included to understand the longevity of the problem and the background from earlier researchers. The literature survey includes analyses, testing, modeling, and simulation of aircraft landing gear; and experimental validation and characterization of shimmy and brake-induced vibration of aircraft landing gear. The paper presents an overview of the problem, background information, and a history of landing gear dynamics problems and solutions. Based on the survey an assessment and recommendations of the most critically needed enhancements to the state of the art will be presented. The status of Langley work contributing to this activity will be given.

Landing-Impact Characteristics of Load-Alleviating Struts on a Model of a Winged Space Vehicle

Landing-Impact Characteristics of Load-Alleviating Struts on a Model of a Winged Space Vehicle
Author: Ulysse J. Blanchard
Publisher:
Total Pages: 32
Release: 1960
Genre:
ISBN:

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A brief experimental investigation was made of the landing-impact characteristics of a 1/9-scale dynamic model of a winged space vehicle. The landing tests were made by catapulting a free model onto a hard; surface runway and onto water. The model had a conical fuselage and a flat - plate wing with a basic delta planform and 75 deg sweepback of the leading edge. The use of yielding-metal shock absorbers and various landing-gear arrangements was investigated during landing impact. The basic landing gear consisted of a dual rubber-tired nose wheel and twin main skids aft of the center of gravity near the wing tips. landing motion and acceleration data were obtained over a range of landing attitudes, gross weights, and initial sinking speeds. Brief tests were made with an alternate nose-wheel location. An all-skid configuration also was briefly evaluated for hard-surface and water landings. The landing gear employing yielding struts for impact-energy absorption during hard-surface landings resulted in accelerations of approximately 5 1/2 g near the nose gear over a range of landing parameters. Replacing the nose wheel and tire with a skid did not significantly change the accelerations. Landings in smooth water with rigid struts and adequate planing area at the nose skid resulted in a maximum landing acceleration of approximately 4g.

Index Aeronauticus

Index Aeronauticus
Author:
Publisher:
Total Pages: 806
Release: 1960
Genre: Aeronautics
ISBN:

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NASA SP.

NASA SP.
Author:
Publisher:
Total Pages: 924
Release: 1962
Genre: Aeronautics
ISBN:

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Index of NACA Technical Publications

Index of NACA Technical Publications
Author: United States. National Advisory Committee for Aeronautics
Publisher:
Total Pages: 860
Release: 1957
Genre: Aeronautics
ISBN:

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Index of NASA Technical Publications

Index of NASA Technical Publications
Author: United States. National Aeronautics and Space Administration
Publisher:
Total Pages: 500
Release: 1959
Genre: Aeronautics
ISBN:

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