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Soil/Wheel Interaction at High Speed
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English
Abstract
Tests of wheels towed through soft soils at high speed have revealed interaction phenomena that are important for design of various high speed vehicles, especially aircraft which are strongly influenced during takeoff and landing by the wheel drag loads. Available data shows that high drag loads are encountered upon starting, followed by a minimum at approximately 20 knots and then a second drag load peak in the 40-80 knot range. Recent tests at the NASA Landing Loads Track have shown that the rut depths have the same velocity relationships as the drag loads. Tests were conducted with a 29 X 11-10 8PR tire loaded to 5000 lb on buckshot clay at CBR 1.5, 2.3, and 4.4 and at CBR 1.5 on sand. An analytical model to predict wheel drag load and rutting is developed from a combination of currently used empirical drag load and rut depth prediction methods and high speed interaction factors which produces fair agreement with measured ruts and drag loads over the velocity range from zero to approximately 100 knots. Both the tests and analysis indicate that the interaction is most pronounced for soft surfaces and high tire pressures; it is reduced if either the tire pressure is reduced or if the soil strength increases.
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Authors
Citation
Crenshaw, B., "Soil/Wheel Interaction at High Speed," SAE Technical Paper 710181, 1971, https://doi.org/10.4271/710181.Also In
References
- Crenshaw B. M. Butterworth C. K. Truesdale W. B. “Aircraft Landing Gear Dynamic Loads from Operation on Clay and Sandy Soil.” Lockheed-Georgia Co. and IIT Research Institute Report AFFDL-TR-69-51 June 1969
- Richmond L. D. Burske N. W. DeBord K. J. et al “Aircraft Dynamic Loads from Substandard Landing Sites.” The Boeing Co. Report AFFDL-TR-67-145 September 1968
- “Performance of Soils under Tire Loads.” U. S. Army Engineer Waterways Experiment Station, Corps of Engineers Technical Report No. 3-666 January 1965
- Frietag Dean R. “Wheels on Soft Soils, An Analysis of Existing Data.” U. S. Army Engineer Waterways Experiment Station, Corps of Engineers Technical Report No. 3-670 January 1965
- Hegedus Ervin “Pressure Distribution under Rigid Wheels.” Transactions of the ASAE 1965 305