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Title: A dimensional analysis of the performance of pneumatic tires on soft soils
Authors: United States. Army Materiel Command.
U.S. Army Engineer Waterways Experiment Station
Keywords: Bekker system
Publisher: U.S. Army Engineer Waterways Experiment Station.
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; no.3-688.
Description: Technical report
Abstract: Treadless pneumatic tires were tested in specially prepared wet clay and dry sand. Horizontal and vertical forces, torque, slip, and sinkage were measured. The test variables included tire width and diameter , tire deflection, and the load on the tire. The soil strength was varied over the full practicable range. A dimensional analysis of the tire-soil systems tested yielded four principal independent Pi terms: the shape number b\d, the deflection number 8/h, the clay loading number cd2/W, and the sand loading number Gd3/ W. Four dependent Pi term s--the pull number P/W, the sinkage number z/d, the torque number Q/dW, and the towed force number PT\W ---were used as measures of tire performance. The experimental results showed, both for the clay and the sand that the consistency of the soil could be evaluated, and that true scaled systems could be achieved. A single term was developed for each of the soils that combined all of the independent parameters and this term was shown to be related to the dependent parameters. Curves delineating the following relations were developed and verified.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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