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Tire stiffness and damping determined from static and free-vibration testsStiffness and damping of a nonrolling tire were determined experimentally from both static force-displacement relations and the free-vibration behavior of a cable-suspended platen pressed against the tire periphery. Lateral and force-and-aft spring constants and damping factors of a 49 x 17 size aircraft tire for different tire pressure and vertical loads were measured assuming a rate-independent damping form. In addition, a technique was applied for estimating the magnitude of the tire mass which participates in the vibratory motion of the dynamic tests. Results show that both the lateral and force-and-aft spring constants generally increase with tire pressure but only the latter increased significantly with vertical tire loading. The fore-and-aft spring constants were greater than those in the lateral direction. The static-spring-constant variations were similar to the dynamic variations but exhibited lower magnitudes. Damping was small and insensitive to tire loading. Furthermore, static damping accounted for a significant portion of that found dynamically. Effective tire masses were also small.
Document ID
19800018802
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Sleeper, R. K. (NASA Langley Research Center Hampton, VA, United States)
Dreher, R. C. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 4, 2013
Publication Date
July 1, 1980
Subject Category
Air Transportation And Safety
Report/Patent Number
NASA-TP-1671
L-13500
Accession Number
80N27302
Funding Number(s)
PROJECT: RTOP 505-44-33-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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